<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `DoubleEndedIterator` trait in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, DoubleEndedIterator"><title>core::iter::DoubleEndedIterator - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../core/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><p class='location'>Trait DoubleEndedIterator</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.next_back">next_back</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.nth_back">nth_back</a><a href="#method.rfind">rfind</a><a href="#method.rfold">rfold</a><a href="#method.try_rfold">try_rfold</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>iter</a></p><script>window.sidebarCurrent = {name: 'DoubleEndedIterator', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#39-287' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>core</a>::<wbr><a href='index.html'>iter</a>::<wbr><a class="trait" href=''>DoubleEndedIterator</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait DoubleEndedIterator: <a class="trait" href="../../core/iter/trait.Iterator.html" title="trait core::iter::Iterator">Iterator</a> {
fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>>;
fn <a href='#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> { ... }
<div class='item-spacer'></div> fn <a href='#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R<br> <span class="where">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B<br> <span class="where">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>><br> <span class="where">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool</span>,
{ ... }
}</pre></div><div class='docblock'><p>An iterator able to yield elements from both ends.</p>
<p>Something that implements <code>DoubleEndedIterator</code> has one extra capability
over something that implements <a href="trait.Iterator.html"><code>Iterator</code></a>: the ability to also take
<code>Item</code>s from the back, as well as the front.</p>
<p>It is important to note that both back and forth work on the same range,
and do not cross: iteration is over when they meet in the middle.</p>
<p>In a similar fashion to the <a href="trait.Iterator.html"><code>Iterator</code></a> protocol, once a
<code>DoubleEndedIterator</code> returns <code>None</code> from a <code>next_back()</code>, calling it again
may or may not ever return <code>Some</code> again. <code>next()</code> and <code>next_back()</code> are
interchangeable for this purpose.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">numbers</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">numbers</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">6</span>), <span class="ident">iter</span>.<span class="ident">next_back</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">5</span>), <span class="ident">iter</span>.<span class="ident">next_back</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">4</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next_back</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20numbers%20%3D%20vec!%5B1%2C%202%2C%203%2C%204%2C%205%2C%206%5D%3B%0A%0Alet%20mut%20iter%20%3D%20numbers.iter()%3B%0A%0Aassert_eq!(Some(%261)%2C%20iter.next())%3B%0Aassert_eq!(Some(%266)%2C%20iter.next_back())%3B%0Aassert_eq!(Some(%265)%2C%20iter.next_back())%3B%0Aassert_eq!(Some(%262)%2C%20iter.next())%3B%0Aassert_eq!(Some(%263)%2C%20iter.next())%3B%0Aassert_eq!(Some(%264)%2C%20iter.next())%3B%0Aassert_eq!(None%2C%20iter.next())%3B%0Aassert_eq!(None%2C%20iter.next_back())%3B%0A%7D">Run</a></pre></div>
</div>
<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.next_back' class='method'><code id='next_back.v'>fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code></h3><div class='docblock'><p>Removes and returns an element from the end of the iterator.</p>
<p>Returns <code>None</code> when there are no more elements.</p>
<p>The <a href="trait.DoubleEndedIterator.html">trait-level</a> docs contain more details.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">numbers</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">numbers</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">6</span>), <span class="ident">iter</span>.<span class="ident">next_back</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">5</span>), <span class="ident">iter</span>.<span class="ident">next_back</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">4</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next_back</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20numbers%20%3D%20vec!%5B1%2C%202%2C%203%2C%204%2C%205%2C%206%5D%3B%0A%0Alet%20mut%20iter%20%3D%20numbers.iter()%3B%0A%0Aassert_eq!(Some(%261)%2C%20iter.next())%3B%0Aassert_eq!(Some(%266)%2C%20iter.next_back())%3B%0Aassert_eq!(Some(%265)%2C%20iter.next_back())%3B%0Aassert_eq!(Some(%262)%2C%20iter.next())%3B%0Aassert_eq!(Some(%263)%2C%20iter.next())%3B%0Aassert_eq!(Some(%264)%2C%20iter.next())%3B%0Aassert_eq!(None%2C%20iter.next())%3B%0Aassert_eq!(None%2C%20iter.next_back())%3B%0A%7D">Run</a></pre></div>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.nth_back' class='method'><code id='nth_back.v'>fn <a href='#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code></h3><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><div class='docblock'><p>Returns the <code>n</code>th element from the end of the iterator.</p>
<p>This is essentially the reversed version of <a href="../../std/iter/trait.Iterator.html#method.nth"><code>nth</code></a>. Although like most indexing
operations, the count starts from zero, so <code>nth_back(0)</code> returns the first value fro
the end, <code>nth_back(1)</code> the second, and so on.</p>
<p>Note that all elements between the end and the returned element will be
consumed, including the returned element. This also means that calling
<code>nth_back(0)</code> multiple times on the same iterator will return different
elements.</p>
<p><code>nth_back()</code> will return <a href="../../std/option/enum.Option.html#variant.None"><code>None</code></a> if <code>n</code> is greater than or equal to the length of the
iterator.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">iter_nth_back</span>)]</span>
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">nth_back</span>(<span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(iter_nth_back)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B1%2C%202%2C%203%5D%3B%0Aassert_eq!(a.iter().nth_back(2)%2C%20Some(%261))%3B%0A%7D&version=nightly">Run</a></pre></div>
<p>Calling <code>nth_back()</code> multiple times doesn't rewind the iterator:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">iter_nth_back</span>)]</span>
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">nth_back</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">nth_back</span>(<span class="number">1</span>), <span class="prelude-val">None</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(iter_nth_back)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B1%2C%202%2C%203%5D%3B%0A%0Alet%20mut%20iter%20%3D%20a.iter()%3B%0A%0Aassert_eq!(iter.nth_back(1)%2C%20Some(%262))%3B%0Aassert_eq!(iter.nth_back(1)%2C%20None)%3B%0A%7D&version=nightly">Run</a></pre></div>
<p>Returning <code>None</code> if there are less than <code>n + 1</code> elements:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">iter_nth_back</span>)]</span>
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">nth_back</span>(<span class="number">10</span>), <span class="prelude-val">None</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(iter_nth_back)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B1%2C%202%2C%203%5D%3B%0Aassert_eq!(a.iter().nth_back(10)%2C%20None)%3B%0A%7D&version=nightly">Run</a></pre></div>
</div><h3 id='method.try_rfold' class='method'><code id='try_rfold.v'>fn <a href='#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div></h3><div class='docblock'><p>This is the reverse version of <a href="trait.Iterator.html#method.try_fold"><code>try_fold()</code></a>: it takes elements
starting from the back of the iterator.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="string">"1"</span>, <span class="string">"2"</span>, <span class="string">"3"</span>];
<span class="kw">let</span> <span class="ident">sum</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>())
.<span class="ident">try_rfold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">y</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">acc</span> <span class="op">+</span> <span class="ident">y</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">sum</span>, <span class="prelude-val">Ok</span>(<span class="number">6</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B%221%22%2C%20%222%22%2C%20%223%22%5D%3B%0Alet%20sum%20%3D%20a.iter()%0A%20%20%20%20.map(%7C%26s%7C%20s.parse%3A%3A%3Ci32%3E())%0A%20%20%20%20.try_rfold(0%2C%20%7Cacc%2C%20x%7C%20x.and_then(%7Cy%7C%20Ok(acc%20%2B%20y)))%3B%0Aassert_eq!(sum%2C%20Ok(6))%3B%0A%7D">Run</a></pre></div>
<p>Short-circuiting:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="string">"1"</span>, <span class="string">"rust"</span>, <span class="string">"3"</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">iter</span>();
<span class="kw">let</span> <span class="ident">sum</span> <span class="op">=</span> <span class="ident">it</span>
.<span class="ident">by_ref</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>())
.<span class="ident">try_rfold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">y</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">acc</span> <span class="op">+</span> <span class="ident">y</span>)));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">sum</span>.<span class="ident">is_err</span>());
<span class="comment">// Because it short-circuited, the remaining elements are still</span>
<span class="comment">// available through the iterator.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next_back</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">"1"</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B%221%22%2C%20%22rust%22%2C%20%223%22%5D%3B%0Alet%20mut%20it%20%3D%20a.iter()%3B%0Alet%20sum%20%3D%20it%0A%20%20%20%20.by_ref()%0A%20%20%20%20.map(%7C%26s%7C%20s.parse%3A%3A%3Ci32%3E())%0A%20%20%20%20.try_rfold(0%2C%20%7Cacc%2C%20x%7C%20x.and_then(%7Cy%7C%20Ok(acc%20%2B%20y)))%3B%0Aassert!(sum.is_err())%3B%0A%0A%2F%2F%20Because%20it%20short-circuited%2C%20the%20remaining%20elements%20are%20still%0A%2F%2F%20available%20through%20the%20iterator.%0Aassert_eq!(it.next_back()%2C%20Some(%26%221%22))%3B%0A%7D">Run</a></pre></div>
</div><h3 id='method.rfold' class='method'><code id='rfold.v'>fn <a href='#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div></h3><div class='docblock'><p>An iterator method that reduces the iterator's elements to a single,
final value, starting from the back.</p>
<p>This is the reverse version of <a href="trait.Iterator.html#method.fold"><code>fold()</code></a>: it takes elements starting from
the back of the iterator.</p>
<p><code>rfold()</code> takes two arguments: an initial value, and a closure with two
arguments: an 'accumulator', and an element. The closure returns the value that
the accumulator should have for the next iteration.</p>
<p>The initial value is the value the accumulator will have on the first
call.</p>
<p>After applying this closure to every element of the iterator, <code>rfold()</code>
returns the accumulator.</p>
<p>This operation is sometimes called 'reduce' or 'inject'.</p>
<p>Folding is useful whenever you have a collection of something, and want
to produce a single value from it.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="comment">// the sum of all of the elements of a</span>
<span class="kw">let</span> <span class="ident">sum</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">iter</span>()
.<span class="ident">rfold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="kw-2">&</span><span class="ident">x</span><span class="op">|</span> <span class="ident">acc</span> <span class="op">+</span> <span class="ident">x</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">sum</span>, <span class="number">6</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B1%2C%202%2C%203%5D%3B%0A%0A%2F%2F%20the%20sum%20of%20all%20of%20the%20elements%20of%20a%0Alet%20sum%20%3D%20a.iter()%0A%20%20%20%20%20%20%20%20%20%20%20.rfold(0%2C%20%7Cacc%2C%20%26x%7C%20acc%20%2B%20x)%3B%0A%0Aassert_eq!(sum%2C%206)%3B%0A%7D">Run</a></pre></div>
<p>This example builds a string, starting with an initial value
and continuing with each element from the back until the front:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">numbers</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
<span class="kw">let</span> <span class="ident">zero</span> <span class="op">=</span> <span class="string">"0"</span>.<span class="ident">to_string</span>();
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">numbers</span>.<span class="ident">iter</span>().<span class="ident">rfold</span>(<span class="ident">zero</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="kw-2">&</span><span class="ident">x</span><span class="op">|</span> {
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"({} + {})"</span>, <span class="ident">x</span>, <span class="ident">acc</span>)
});
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="string">"(1 + (2 + (3 + (4 + (5 + 0)))))"</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20numbers%20%3D%20%5B1%2C%202%2C%203%2C%204%2C%205%5D%3B%0A%0Alet%20zero%20%3D%20%220%22.to_string()%3B%0A%0Alet%20result%20%3D%20numbers.iter().rfold(zero%2C%20%7Cacc%2C%20%26x%7C%20%7B%0A%20%20%20%20format!(%22(%7B%7D%20%2B%20%7B%7D)%22%2C%20x%2C%20acc)%0A%7D)%3B%0A%0Aassert_eq!(result%2C%20%22(1%20%2B%20(2%20%2B%20(3%20%2B%20(4%20%2B%20(5%20%2B%200)))))%22)%3B%0A%7D">Run</a></pre></div>
</div><h3 id='method.rfind' class='method'><code id='rfind.v'>fn <a href='#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div></h3><div class='docblock'><p>Searches for an element of an iterator from the back that satisfies a predicate.</p>
<p><code>rfind()</code> takes a closure that returns <code>true</code> or <code>false</code>. It applies
this closure to each element of the iterator, starting at the end, and if any
of them return <code>true</code>, then <code>rfind()</code> returns <a href="../../std/option/enum.Option.html#variant.Some"><code>Some(element)</code></a>. If they all return
<code>false</code>, it returns <a href="../../std/option/enum.Option.html#variant.None"><code>None</code></a>.</p>
<p><code>rfind()</code> is short-circuiting; in other words, it will stop processing
as soon as the closure returns <code>true</code>.</p>
<p>Because <code>rfind()</code> takes a reference, and many iterators iterate over
references, this leads to a possibly confusing situation where the
argument is a double reference. You can see this effect in the
examples below, with <code>&&x</code>.</p>
<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">rfind</span>(<span class="op">|</span><span class="op">&&</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">rfind</span>(<span class="op">|</span><span class="op">&&</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">5</span>), <span class="prelude-val">None</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B1%2C%202%2C%203%5D%3B%0A%0Aassert_eq!(a.iter().rfind(%7C%26%26x%7C%20x%20%3D%3D%202)%2C%20Some(%262))%3B%0A%0Aassert_eq!(a.iter().rfind(%7C%26%26x%7C%20x%20%3D%3D%205)%2C%20None)%3B%0A%7D">Run</a></pre></div>
<p>Stopping at the first <code>true</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">rfind</span>(<span class="op">|</span><span class="op">&&</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="comment">// we can still use `iter`, as there are more elements.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next_back</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20a%20%3D%20%5B1%2C%202%2C%203%5D%3B%0A%0Alet%20mut%20iter%20%3D%20a.iter()%3B%0A%0Aassert_eq!(iter.rfind(%7C%26%26x%7C%20x%20%3D%3D%202)%2C%20Some(%262))%3B%0A%0A%2F%2F%20we%20can%20still%20use%20%60iter%60%2C%20as%20there%20are%20more%20elements.%0Aassert_eq!(iter.next_back()%2C%20Some(%261))%3B%0A%7D">Run</a></pre></div>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-DoubleEndedIterator' class='impl'><code class='in-band'>impl DoubleEndedIterator for <a class="struct" href="../../core/ascii/struct.EscapeDefault.html" title="struct core::ascii::EscapeDefault">EscapeDefault</a></code><a href='#impl-DoubleEndedIterator' class='anchor'></a><a class='srclink' href='../../src/core/ascii.rs.html#122-126' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back' class="method hidden"><code id='next_back.v-1'>fn <a href='#method.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><u8></code><a class='srclink' href='../../src/core/ascii.rs.html#123-125' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-1' class="method"><code id='nth_back.v-1'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-1' class="method"><code id='try_rfold.v-1'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-1' class="method"><code id='rfold.v-1'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-1' class="method"><code id='rfind.v-1'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-1' class='impl'><code class='in-band'>impl<'_> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.Bytes.html" title="struct core::str::Bytes">Bytes</a><'_></code><a href='#impl-DoubleEndedIterator-1' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#792-804' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-1' class="method hidden"><code id='next_back.v-2'>fn <a href='#method.next_back-1' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><u8></code><a class='srclink' href='../../src/core/str/mod.rs.html#794-796' title='goto source code'>[src]</a></h4><h4 id='method.rfind-2' class="method hidden"><code id='rfind.v-2'>fn <a href='#method.rfind-2' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><a class='srclink' href='../../src/core/str/mod.rs.html#799-803' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-2' class="method"><code id='nth_back.v-2'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-2' class="method"><code id='try_rfold.v-2'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-2' class="method"><code id='rfold.v-2'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-2' class='impl'><code class='in-band'>impl<'a> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.CharIndices.html" title="struct core::str::CharIndices">CharIndices</a><'a></code><a href='#impl-DoubleEndedIterator-2' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#694-702' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-2' class="method hidden"><code id='next_back.v-3'>fn <a href='#method.next_back-2' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, char)></code><a class='srclink' href='../../src/core/str/mod.rs.html#696-701' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-3' class="method"><code id='nth_back.v-3'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-3' class="method"><code id='try_rfold.v-3'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-3' class="method"><code id='rfold.v-3'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-3' class="method"><code id='rfind.v-3'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-3' class='impl'><code class='in-band'>impl<'a> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.Chars.html" title="struct core::str::Chars">Chars</a><'a></code><a href='#impl-DoubleEndedIterator-3' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#602-612' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-3' class="method hidden"><code id='next_back.v-4'>fn <a href='#method.next_back-3' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><char></code><a class='srclink' href='../../src/core/str/mod.rs.html#604-611' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-4' class="method"><code id='nth_back.v-4'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-4' class="method"><code id='try_rfold.v-4'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-4' class="method"><code id='rfold.v-4'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-4' class="method"><code id='rfind.v-4'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-4' class='impl'><code class='in-band'>impl<'a> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.Lines.html" title="struct core::str::Lines">Lines</a><'a></code><a href='#impl-DoubleEndedIterator-4' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#1332-1337' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-4' class="method hidden"><code id='next_back.v-5'>fn <a href='#method.next_back-4' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1334-1336' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-5' class="method"><code id='nth_back.v-5'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-5' class="method"><code id='try_rfold.v-5'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-5' class="method"><code id='rfold.v-5'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-5' class="method"><code id='rfind.v-5'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-5' class='impl'><code class='in-band'>impl<'a> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.LinesAny.html" title="struct core::str::LinesAny">LinesAny</a><'a></code><a href='#impl-DoubleEndedIterator-5' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#1379-1384' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-5' class="method hidden"><code id='next_back.v-6'>fn <a href='#method.next_back-5' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1381-1383' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-6' class="method"><code id='nth_back.v-6'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-6' class="method"><code id='try_rfold.v-6'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-6' class="method"><code id='rfold.v-6'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-6' class="method"><code id='rfind.v-6'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-6' class='impl'><code class='in-band'>impl<'a> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.SplitAsciiWhitespace.html" title="struct core::str::SplitAsciiWhitespace">SplitAsciiWhitespace</a><'a></code><a href='#impl-DoubleEndedIterator-6' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#4242-4247' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-6' class="method hidden"><code id='next_back.v-7'>fn <a href='#method.next_back-6' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#4244-4246' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-7' class="method"><code id='nth_back.v-7'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-7' class="method"><code id='try_rfold.v-7'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-7' class="method"><code id='rfold.v-7'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-7' class="method"><code id='rfind.v-7'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-7' class='impl'><code class='in-band'>impl<'a> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.SplitWhitespace.html" title="struct core::str::SplitWhitespace">SplitWhitespace</a><'a></code><a href='#impl-DoubleEndedIterator-7' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#4216-4221' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-7' class="method hidden"><code id='next_back.v-8'>fn <a href='#method.next_back-7' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#4218-4220' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-8' class="method"><code id='nth_back.v-8'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-8' class="method"><code id='try_rfold.v-8'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-8' class="method"><code id='rfold.v-8'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-8' class="method"><code id='rfind.v-8'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-8' class='impl'><code class='in-band'>impl<'a, A> DoubleEndedIterator for core::option::<a class="struct" href="../../core/option/struct.Iter.html" title="struct core::option::Iter">Iter</a><'a, A></code><a href='#impl-DoubleEndedIterator-8' class='anchor'></a><a class='srclink' href='../../src/core/option.rs.html#1174-1177' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-8' class="method hidden"><code id='next_back.v-9'>fn <a href='#method.next_back-8' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a A></code><a class='srclink' href='../../src/core/option.rs.html#1176' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-9' class="method"><code id='nth_back.v-9'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-9' class="method"><code id='try_rfold.v-9'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-9' class="method"><code id='rfold.v-9'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-9' class="method"><code id='rfind.v-9'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-9' class='impl'><code class='in-band'>impl<'a, A> DoubleEndedIterator for core::option::<a class="struct" href="../../core/option/struct.IterMut.html" title="struct core::option::IterMut">IterMut</a><'a, A></code><a href='#impl-DoubleEndedIterator-9' class='anchor'></a><a class='srclink' href='../../src/core/option.rs.html#1220-1223' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-9' class="method hidden"><code id='next_back.v-10'>fn <a href='#method.next_back-9' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut A></code><a class='srclink' href='../../src/core/option.rs.html#1222' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-10' class="method"><code id='nth_back.v-10'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-10' class="method"><code id='try_rfold.v-10'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-10' class="method"><code id='rfold.v-10'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-10' class="method"><code id='rfind.v-10'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-10' class='impl'><code class='in-band'>impl<'a, I, T: 'a> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Cloned.html" title="struct core::iter::Cloned">Cloned</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a><Item = &'a T>,<br> T: <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, </span></code><a href='#impl-DoubleEndedIterator-10' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#277-295' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-10' class="method hidden"><code id='next_back.v-11'>fn <a href='#method.next_back-10' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#280-282' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-11' class="method hidden"><code id='try_rfold.v-11'>fn <a href='#method.try_rfold-11' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#284-288' title='goto source code'>[src]</a></h4><h4 id='method.rfold-11' class="method hidden"><code id='rfold.v-11'>fn <a href='#method.rfold-11' class='fnname'>rfold</a><Acc, F>(self, init: Acc, f: F) -> Acc <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#290-294' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-11' class="method"><code id='nth_back.v-11'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-11' class="method"><code id='rfind.v-11'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-11' class='impl'><code class='in-band'>impl<'a, I, T: 'a> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Copied.html" title="struct core::iter::Copied">Copied</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a><Item = &'a T>,<br> T: <a class="trait" href="../../core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>, </span></code><a href='#impl-DoubleEndedIterator-11' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#172-190' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-11' class="method hidden"><code id='next_back.v-12'>fn <a href='#method.next_back-11' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#175-177' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-12' class="method hidden"><code id='try_rfold.v-12'>fn <a href='#method.try_rfold-12' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#179-183' title='goto source code'>[src]</a></h4><h4 id='method.rfold-12' class="method hidden"><code id='rfold.v-12'>fn <a href='#method.rfold-12' class='fnname'>rfold</a><Acc, F>(self, init: Acc, f: F) -> Acc <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#185-189' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-12' class="method"><code id='nth_back.v-12'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-12' class="method"><code id='rfind.v-12'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-12' class='impl'><code class='in-band'>impl<'a, I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a> + ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> DoubleEndedIterator for &'a mut I</code><a href='#impl-DoubleEndedIterator-12' class='anchor'></a><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#290-297' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-12' class="method hidden"><code id='next_back.v-13'>fn <a href='#method.next_back-12' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#291-293' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-13' class="method hidden"><code id='nth_back.v-13'>fn <a href='#method.nth_back-13' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#294-296' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-13' class="method"><code id='try_rfold.v-13'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-13' class="method"><code id='rfold.v-13'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-13' class="method"><code id='rfind.v-13'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-13' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.MatchIndices.html" title="struct core::str::MatchIndices">MatchIndices</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-13' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#996-1003' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-13' class="method hidden"><code id='next_back.v-14'>fn <a href='#method.next_back-13' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, &'a str)></code><a class='srclink' href='../../src/core/str/mod.rs.html#1000-1002' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-14' class="method"><code id='nth_back.v-14'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-14' class="method"><code id='try_rfold.v-14'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-14' class="method"><code id='rfold.v-14'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-14' class="method"><code id='rfind.v-14'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-14' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.Matches.html" title="struct core::str::Matches">Matches</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-14' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#996-1003' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-14' class="method hidden"><code id='next_back.v-15'>fn <a href='#method.next_back-14' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1000-1002' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-15' class="method"><code id='nth_back.v-15'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-15' class="method"><code id='try_rfold.v-15'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-15' class="method"><code id='rfold.v-15'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-15' class="method"><code id='rfind.v-15'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-15' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.RMatchIndices.html" title="struct core::str::RMatchIndices">RMatchIndices</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-15' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#1006-1013' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-15' class="method hidden"><code id='next_back.v-16'>fn <a href='#method.next_back-15' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, &'a str)></code><a class='srclink' href='../../src/core/str/mod.rs.html#1010-1012' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-16' class="method"><code id='nth_back.v-16'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-16' class="method"><code id='try_rfold.v-16'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-16' class="method"><code id='rfold.v-16'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-16' class="method"><code id='rfind.v-16'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-16' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.RMatches.html" title="struct core::str::RMatches">RMatches</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-16' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#1006-1013' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-16' class="method hidden"><code id='next_back.v-17'>fn <a href='#method.next_back-16' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1010-1012' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-17' class="method"><code id='nth_back.v-17'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-17' class="method"><code id='try_rfold.v-17'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-17' class="method"><code id='rfold.v-17'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-17' class="method"><code id='rfind.v-17'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-17' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for core::str::<a class="struct" href="../../core/str/struct.RSplit.html" title="struct core::str::RSplit">RSplit</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-17' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#1006-1013' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-17' class="method hidden"><code id='next_back.v-18'>fn <a href='#method.next_back-17' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1010-1012' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-18' class="method"><code id='nth_back.v-18'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-18' class="method"><code id='try_rfold.v-18'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-18' class="method"><code id='rfold.v-18'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-18' class="method"><code id='rfind.v-18'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-18' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.RSplitTerminator.html" title="struct core::str::RSplitTerminator">RSplitTerminator</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-18' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#1006-1013' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-18' class="method hidden"><code id='next_back.v-19'>fn <a href='#method.next_back-18' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1010-1012' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-19' class="method"><code id='nth_back.v-19'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-19' class="method"><code id='try_rfold.v-19'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-19' class="method"><code id='rfold.v-19'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-19' class="method"><code id='rfind.v-19'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-19' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for core::str::<a class="struct" href="../../core/str/struct.Split.html" title="struct core::str::Split">Split</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-19' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#996-1003' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-19' class="method hidden"><code id='next_back.v-20'>fn <a href='#method.next_back-19' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1000-1002' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-20' class="method"><code id='nth_back.v-20'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-20' class="method"><code id='try_rfold.v-20'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-20' class="method"><code id='rfold.v-20'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-20' class="method"><code id='rfind.v-20'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-20' class='impl'><code class='in-band'>impl<'a, P: <a class="trait" href="../../core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>> DoubleEndedIterator for <a class="struct" href="../../core/str/struct.SplitTerminator.html" title="struct core::str::SplitTerminator">SplitTerminator</a><'a, P> <span class="where fmt-newline">where<br> P::<a class="type" href="../../core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><a href='#impl-DoubleEndedIterator-20' class='anchor'></a><a class='srclink' href='../../src/core/str/mod.rs.html#996-1003' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-20' class="method hidden"><code id='next_back.v-21'>fn <a href='#method.next_back-20' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a str></code><a class='srclink' href='../../src/core/str/mod.rs.html#1000-1002' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-21' class="method"><code id='nth_back.v-21'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-21' class="method"><code id='try_rfold.v-21'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-21' class="method"><code id='rfold.v-21'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-21' class="method"><code id='rfind.v-21'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-21' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for core::result::<a class="struct" href="../../core/result/struct.Iter.html" title="struct core::result::Iter">Iter</a><'a, T></code><a href='#impl-DoubleEndedIterator-21' class='anchor'></a><a class='srclink' href='../../src/core/result.rs.html#1083-1086' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-21' class="method hidden"><code id='next_back.v-22'>fn <a href='#method.next_back-21' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a T></code><a class='srclink' href='../../src/core/result.rs.html#1085' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-22' class="method"><code id='nth_back.v-22'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-22' class="method"><code id='try_rfold.v-22'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-22' class="method"><code id='rfold.v-22'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-22' class="method"><code id='rfind.v-22'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-22' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for core::result::<a class="struct" href="../../core/result/struct.IterMut.html" title="struct core::result::IterMut">IterMut</a><'a, T></code><a href='#impl-DoubleEndedIterator-22' class='anchor'></a><a class='srclink' href='../../src/core/result.rs.html#1128-1131' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-22' class="method hidden"><code id='next_back.v-23'>fn <a href='#method.next_back-22' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut T></code><a class='srclink' href='../../src/core/result.rs.html#1130' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-23' class="method"><code id='nth_back.v-23'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-23' class="method"><code id='try_rfold.v-23'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-23' class="method"><code id='rfold.v-23'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-23' class="method"><code id='rfind.v-23'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-23' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.Chunks.html" title="struct core::slice::Chunks">Chunks</a><'a, T></code><a href='#impl-DoubleEndedIterator-23' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4139-4152' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-23' class="method hidden"><code id='next_back.v-24'>fn <a href='#method.next_back-23' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4141-4151' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-24' class="method"><code id='nth_back.v-24'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-24' class="method"><code id='try_rfold.v-24'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-24' class="method"><code id='rfold.v-24'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-24' class="method"><code id='rfind.v-24'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-24' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.ChunksExact.html" title="struct core::slice::ChunksExact">ChunksExact</a><'a, T></code><a href='#impl-DoubleEndedIterator-24' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4385-4396' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-24' class="method hidden"><code id='next_back.v-25'>fn <a href='#method.next_back-24' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4387-4395' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-25' class="method"><code id='nth_back.v-25'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-25' class="method"><code id='try_rfold.v-25'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-25' class="method"><code id='rfold.v-25'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-25' class="method"><code id='rfind.v-25'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-25' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.ChunksExactMut.html" title="struct core::slice::ChunksExactMut">ChunksExactMut</a><'a, T></code><a href='#impl-DoubleEndedIterator-25' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4499-4512' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-25' class="method hidden"><code id='next_back.v-26'>fn <a href='#method.next_back-25' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4501-4511' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-26' class="method"><code id='nth_back.v-26'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-26' class="method"><code id='try_rfold.v-26'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-26' class="method"><code id='rfold.v-26'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-26' class="method"><code id='rfind.v-26'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-26' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.ChunksMut.html" title="struct core::slice::ChunksMut">ChunksMut</a><'a, T></code><a href='#impl-DoubleEndedIterator-26' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4258-4273' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-26' class="method hidden"><code id='next_back.v-27'>fn <a href='#method.next_back-26' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4260-4272' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-27' class="method"><code id='nth_back.v-27'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-27' class="method"><code id='try_rfold.v-27'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-27' class="method"><code id='rfold.v-27'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-27' class="method"><code id='rfind.v-27'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-27' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for core::slice::<a class="struct" href="../../core/slice/struct.Iter.html" title="struct core::slice::Iter">Iter</a><'a, T></code><a href='#impl-DoubleEndedIterator-27' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#3195-3245' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-27' class="method hidden"><code id='next_back.v-28'>fn <a href='#method.next_back-27' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a T></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3197-3210' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-28' class="method hidden"><code id='try_rfold.v-28'>fn <a href='#method.try_rfold-28' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3213-3231' title='goto source code'>[src]</a></h4><h4 id='method.rfold-28' class="method hidden"><code id='rfold.v-28'>fn <a href='#method.rfold-28' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, f: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3234-3244' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-28' class="method"><code id='nth_back.v-28'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-28' class="method"><code id='rfind.v-28'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-28' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for core::slice::<a class="struct" href="../../core/slice/struct.IterMut.html" title="struct core::slice::IterMut">IterMut</a><'a, T></code><a href='#impl-DoubleEndedIterator-28' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#3195-3245' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-28' class="method hidden"><code id='next_back.v-29'>fn <a href='#method.next_back-28' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut T></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3197-3210' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-29' class="method hidden"><code id='try_rfold.v-29'>fn <a href='#method.try_rfold-29' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3213-3231' title='goto source code'>[src]</a></h4><h4 id='method.rfold-29' class="method hidden"><code id='rfold.v-29'>fn <a href='#method.rfold-29' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, f: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3234-3244' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-29' class="method"><code id='nth_back.v-29'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-29' class="method"><code id='rfind.v-29'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-29' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.RChunks.html" title="struct core::slice::RChunks">RChunks</a><'a, T></code><a href='#impl-DoubleEndedIterator-29' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4630-4643' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-29' class="method hidden"><code id='next_back.v-30'>fn <a href='#method.next_back-29' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4632-4642' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-30' class="method"><code id='nth_back.v-30'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-30' class="method"><code id='try_rfold.v-30'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-30' class="method"><code id='rfold.v-30'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-30' class="method"><code id='rfind.v-30'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-30' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.RChunksExact.html" title="struct core::slice::RChunksExact">RChunksExact</a><'a, T></code><a href='#impl-DoubleEndedIterator-30' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4881-4892' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-30' class="method hidden"><code id='next_back.v-31'>fn <a href='#method.next_back-30' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4883-4891' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-31' class="method"><code id='nth_back.v-31'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-31' class="method"><code id='try_rfold.v-31'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-31' class="method"><code id='rfold.v-31'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-31' class="method"><code id='rfind.v-31'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-31' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.RChunksExactMut.html" title="struct core::slice::RChunksExactMut">RChunksExactMut</a><'a, T></code><a href='#impl-DoubleEndedIterator-31' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4998-5010' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-31' class="method hidden"><code id='next_back.v-32'>fn <a href='#method.next_back-31' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#5000-5009' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-32' class="method"><code id='nth_back.v-32'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-32' class="method"><code id='try_rfold.v-32'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-32' class="method"><code id='rfold.v-32'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-32' class="method"><code id='rfind.v-32'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-32' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.RChunksMut.html" title="struct core::slice::RChunksMut">RChunksMut</a><'a, T></code><a href='#impl-DoubleEndedIterator-32' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4754-4768' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-32' class="method hidden"><code id='next_back.v-33'>fn <a href='#method.next_back-32' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4756-4767' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-33' class="method"><code id='nth_back.v-33'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-33' class="method"><code id='try_rfold.v-33'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-33' class="method"><code id='rfold.v-33'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-33' class="method"><code id='rfind.v-33'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-33' class='impl'><code class='in-band'>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.Windows.html" title="struct core::slice::Windows">Windows</a><'a, T></code><a href='#impl-DoubleEndedIterator-33' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#4006-4030' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-33' class="method hidden"><code id='next_back.v-34'>fn <a href='#method.next_back-33' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4008-4016' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-34' class="method hidden"><code id='nth_back.v-34'>fn <a href='#method.nth_back-34' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/slice/mod.rs.html#4019-4029' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-34' class="method"><code id='try_rfold.v-34'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-34' class="method"><code id='rfold.v-34'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-34' class="method"><code id='rfind.v-34'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-34' class='impl'><code class='in-band'>impl<'a, T, P> DoubleEndedIterator for core::slice::<a class="struct" href="../../core/slice/struct.RSplit.html" title="struct core::slice::RSplit">RSplit</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&T) -> bool, </span></code><a href='#impl-DoubleEndedIterator-34' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#3707-3712' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-34' class="method hidden"><code id='next_back.v-35'>fn <a href='#method.next_back-34' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3709-3711' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-35' class="method"><code id='nth_back.v-35'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-35' class="method"><code id='try_rfold.v-35'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-35' class="method"><code id='rfold.v-35'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-35' class="method"><code id='rfind.v-35'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-35' class='impl'><code class='in-band'>impl<'a, T, P> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.RSplitMut.html" title="struct core::slice::RSplitMut">RSplitMut</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&T) -> bool, </span></code><a href='#impl-DoubleEndedIterator-35' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#3771-3778' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-35' class="method hidden"><code id='next_back.v-36'>fn <a href='#method.next_back-35' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3775-3777' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-36' class="method"><code id='nth_back.v-36'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-36' class="method"><code id='try_rfold.v-36'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-36' class="method"><code id='rfold.v-36'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-36' class="method"><code id='rfind.v-36'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-36' class='impl'><code class='in-band'>impl<'a, T, P> DoubleEndedIterator for core::slice::<a class="struct" href="../../core/slice/struct.Split.html" title="struct core::slice::Split">Split</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&T) -> bool, </span></code><a href='#impl-DoubleEndedIterator-36' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#3544-3558' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-36' class="method hidden"><code id='next_back.v-37'>fn <a href='#method.next_back-36' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3546-3557' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-37' class="method"><code id='nth_back.v-37'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-37' class="method"><code id='try_rfold.v-37'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-37' class="method"><code id='rfold.v-37'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-37' class="method"><code id='rfind.v-37'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-37' class='impl'><code class='in-band'>impl<'a, T, P> DoubleEndedIterator for <a class="struct" href="../../core/slice/struct.SplitMut.html" title="struct core::slice::SplitMut">SplitMut</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&T) -> bool, </span></code><a href='#impl-DoubleEndedIterator-37' class='anchor'></a><a class='srclink' href='../../src/core/slice/mod.rs.html#3642-3663' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-37' class="method hidden"><code id='next_back.v-38'>fn <a href='#method.next_back-37' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut [T]></code><a class='srclink' href='../../src/core/slice/mod.rs.html#3646-3662' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-38' class="method"><code id='nth_back.v-38'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-38' class="method"><code id='try_rfold.v-38'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-38' class="method"><code id='rfold.v-38'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-38' class="method"><code id='rfind.v-38'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-38' class='impl'><code class='in-band'>impl<A> DoubleEndedIterator for core::option::<a class="struct" href="../../core/option/struct.IntoIter.html" title="struct core::option::IntoIter">IntoIter</a><A></code><a href='#impl-DoubleEndedIterator-38' class='anchor'></a><a class='srclink' href='../../src/core/option.rs.html#1257-1260' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-38' class="method hidden"><code id='next_back.v-39'>fn <a href='#method.next_back-38' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><A></code><a class='srclink' href='../../src/core/option.rs.html#1259' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-39' class="method"><code id='nth_back.v-39'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-39' class="method"><code id='try_rfold.v-39'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-39' class="method"><code id='rfold.v-39'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-39' class="method"><code id='rfind.v-39'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-39' class='impl'><code class='in-band'>impl<A, B> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Chain.html" title="struct core::iter::Chain">Chain</a><A, B> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> B: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a><Item = A::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>>, </span></code><a href='#impl-DoubleEndedIterator-39' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/chain.rs.html#190-247' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-39' class="method hidden"><code id='next_back.v-40'>fn <a href='#method.next_back-39' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><A::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/chain.rs.html#195-207' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-40' class="method hidden"><code id='try_rfold.v-40'>fn <a href='#method.try_rfold-40' class='fnname'>try_rfold</a><Acc, F, R>(&mut self, init: Acc, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/chain.rs.html#209-226' title='goto source code'>[src]</a></h4><h4 id='method.rfold-40' class="method hidden"><code id='rfold.v-40'>fn <a href='#method.rfold-40' class='fnname'>rfold</a><Acc, F>(self, init: Acc, f: F) -> Acc <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/chain.rs.html#228-245' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-40' class="method"><code id='nth_back.v-40'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-40' class="method"><code id='rfind.v-40'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-40' class='impl'><code class='in-band'>impl<A, B> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Zip.html" title="struct core::iter::Zip">Zip</a><A, B> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../core/iter/trait.ExactSizeIterator.html" title="trait core::iter::ExactSizeIterator">ExactSizeIterator</a>,<br> B: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../core/iter/trait.ExactSizeIterator.html" title="trait core::iter::ExactSizeIterator">ExactSizeIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-40' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/zip.rs.html#56-64' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-40' class="method hidden"><code id='next_back.v-41'>fn <a href='#method.next_back-40' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(A::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>, B::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>)></code><a class='srclink' href='../../src/core/iter/adapters/zip.rs.html#61-63' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-41' class="method"><code id='nth_back.v-41'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-41' class="method"><code id='try_rfold.v-41'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-41' class="method"><code id='rfold.v-41'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-41' class="method"><code id='rfind.v-41'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-41' class='impl'><code class='in-band'>impl<A, F: <a class="trait" href="../../core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</a>() -> A> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.OnceWith.html" title="struct core::iter::OnceWith">OnceWith</a><F></code><a href='#impl-DoubleEndedIterator-41' class='anchor'></a><a class='srclink' href='../../src/core/iter/sources.rs.html#407-411' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-41' class="method hidden"><code id='next_back.v-42'>fn <a href='#method.next_back-41' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><A></code><a class='srclink' href='../../src/core/iter/sources.rs.html#408-410' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-42' class="method"><code id='nth_back.v-42'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-42' class="method"><code id='try_rfold.v-42'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-42' class="method"><code id='rfold.v-42'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-42' class="method"><code id='rfind.v-42'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-42' class='impl'><code class='in-band'>impl<A: <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Repeat.html" title="struct core::iter::Repeat">Repeat</a><A></code><a href='#impl-DoubleEndedIterator-42' class='anchor'></a><a class='srclink' href='../../src/core/iter/sources.rs.html#29-32' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-42' class="method hidden"><code id='next_back.v-43'>fn <a href='#method.next_back-42' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><A></code><a class='srclink' href='../../src/core/iter/sources.rs.html#31' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-43' class="method"><code id='nth_back.v-43'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-43' class="method"><code id='try_rfold.v-43'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-43' class="method"><code id='rfold.v-43'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-43' class="method"><code id='rfind.v-43'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-43' class='impl'><code class='in-band'>impl<A: <a class="trait" href="../../core/iter/trait.Step.html" title="trait core::iter::Step">Step</a>> DoubleEndedIterator for <a class="struct" href="../../core/ops/struct.Range.html" title="struct core::ops::Range">Range</a><A></code><a href='#impl-DoubleEndedIterator-43' class='anchor'></a><a class='srclink' href='../../src/core/iter/range.rs.html#239-249' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-43' class="method hidden"><code id='next_back.v-44'>fn <a href='#method.next_back-43' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><A></code><a class='srclink' href='../../src/core/iter/range.rs.html#241-248' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-44' class="method"><code id='nth_back.v-44'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-44' class="method"><code id='try_rfold.v-44'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-44' class="method"><code id='rfold.v-44'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-44' class="method"><code id='rfind.v-44'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-44' class='impl'><code class='in-band'>impl<A: <a class="trait" href="../../core/iter/trait.Step.html" title="trait core::iter::Step">Step</a>> DoubleEndedIterator for <a class="struct" href="../../core/ops/struct.RangeInclusive.html" title="struct core::ops::RangeInclusive">RangeInclusive</a><A></code><a href='#impl-DoubleEndedIterator-44' class='anchor'></a><a class='srclink' href='../../src/core/iter/range.rs.html#389-432' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-44' class="method hidden"><code id='next_back.v-45'>fn <a href='#method.next_back-44' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><A></code><a class='srclink' href='../../src/core/iter/range.rs.html#391-404' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-45' class="method hidden"><code id='try_rfold.v-45'>fn <a href='#method.try_rfold-45' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/iter/range.rs.html#407-431' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-45' class="method"><code id='nth_back.v-45'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfold-45' class="method"><code id='rfold.v-45'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-45' class="method"><code id='rfind.v-45'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-45' class='impl'><code class='in-band'>impl<B, I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, F> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.FilterMap.html" title="struct core::iter::FilterMap">FilterMap</a><I, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><B>, </span></code><a href='#impl-DoubleEndedIterator-45' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#843-872' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-45' class="method hidden"><code id='next_back.v-46'>fn <a href='#method.next_back-45' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><B></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#847-849' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-46' class="method hidden"><code id='try_rfold.v-46'>fn <a href='#method.try_rfold-46' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#852-860' title='goto source code'>[src]</a></h4><h4 id='method.rfold-46' class="method hidden"><code id='rfold.v-46'>fn <a href='#method.rfold-46' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#863-871' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-46' class="method"><code id='nth_back.v-46'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-46' class="method"><code id='rfind.v-46'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-46' class='impl'><code class='in-band'>impl<B, I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, F> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Map.html" title="struct core::iter::Map">Map</a><I, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><a href='#impl-DoubleEndedIterator-46' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#592-613' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-46' class="method hidden"><code id='next_back.v-47'>fn <a href='#method.next_back-46' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><B></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#596-598' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-47' class="method hidden"><code id='try_rfold.v-47'>fn <a href='#method.try_rfold-47' class='fnname'>try_rfold</a><Acc, G, R>(&mut self, init: Acc, g: G) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> G: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#600-605' title='goto source code'>[src]</a></h4><h4 id='method.rfold-47' class="method hidden"><code id='rfold.v-47'>fn <a href='#method.rfold-47' class='fnname'>rfold</a><Acc, G>(self, init: Acc, g: G) -> Acc <span class="where fmt-newline">where<br> G: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#607-612' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-47' class="method"><code id='nth_back.v-47'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-47' class="method"><code id='rfind.v-47'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-47' class='impl'><code class='in-band'>impl<I> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Enumerate.html" title="struct core::iter::Enumerate">Enumerate</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.ExactSizeIterator.html" title="trait core::iter::ExactSizeIterator">ExactSizeIterator</a> + <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-47' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#970-1008' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-47' class="method hidden"><code id='next_back.v-48'>fn <a href='#method.next_back-47' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, <I as <a class="trait" href="../../core/iter/trait.Iterator.html" title="trait core::iter::Iterator">Iterator</a>>::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>)></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#974-981' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-48' class="method hidden"><code id='try_rfold.v-48'>fn <a href='#method.try_rfold-48' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#984-994' title='goto source code'>[src]</a></h4><h4 id='method.rfold-48' class="method hidden"><code id='rfold.v-48'>fn <a href='#method.rfold-48' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#997-1007' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-48' class="method"><code id='nth_back.v-48'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-48' class="method"><code id='rfind.v-48'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-48' class='impl'><code class='in-band'>impl<I> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Fuse.html" title="struct core::iter::Fuse">Fuse</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../core/iter/trait.FusedIterator.html" title="trait core::iter::FusedIterator">FusedIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-48' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1872-1893' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-48' class="method hidden"><code id='next_back.v-49'>fn <a href='#method.next_back-48' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<I as <a class="trait" href="../../core/iter/trait.Iterator.html" title="trait core::iter::Iterator">Iterator</a>>::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1876-1878' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-49' class="method hidden"><code id='try_rfold.v-49'>fn <a href='#method.try_rfold-49' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1881-1885' title='goto source code'>[src]</a></h4><h4 id='method.rfold-49' class="method hidden"><code id='rfold.v-49'>fn <a href='#method.rfold-49' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1888-1892' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-49' class="method"><code id='nth_back.v-49'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-49' class="method"><code id='rfind.v-49'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-49' class='impl'><code class='in-band'>impl<I> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Fuse.html" title="struct core::iter::Fuse">Fuse</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-49' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1780-1815' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-49' class="method hidden"><code id='next_back.v-50'>default fn <a href='#method.next_back-49' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<I as <a class="trait" href="../../core/iter/trait.Iterator.html" title="trait core::iter::Iterator">Iterator</a>>::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1782-1790' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-50' class="method hidden"><code id='try_rfold.v-50'>default fn <a href='#method.try_rfold-50' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1793-1803' title='goto source code'>[src]</a></h4><h4 id='method.rfold-50' class="method hidden"><code id='rfold.v-50'>default fn <a href='#method.rfold-50' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1806-1814' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-50' class="method"><code id='nth_back.v-50'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-50' class="method"><code id='rfind.v-50'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-50' class='impl'><code class='in-band'>impl<I> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Rev.html" title="struct core::iter::Rev">Rev</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-50' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#78-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-50' class="method hidden"><code id='next_back.v-51'>fn <a href='#method.next_back-50' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<I as <a class="trait" href="../../core/iter/trait.Iterator.html" title="trait core::iter::Iterator">Iterator</a>>::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#80' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-51' class="method hidden"><code id='nth_back.v-51'>fn <a href='#method.nth_back-51' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<I as <a class="trait" href="../../core/iter/trait.Iterator.html" title="trait core::iter::Iterator">Iterator</a>>::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#83' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-51' class="method hidden"><code id='try_rfold.v-51'>fn <a href='#method.try_rfold-51' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#85-89' title='goto source code'>[src]</a></h4><h4 id='method.rfold-51' class="method hidden"><code id='rfold.v-51'>fn <a href='#method.rfold-51' class='fnname'>rfold</a><Acc, F>(self, init: Acc, f: F) -> Acc <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#91-95' title='goto source code'>[src]</a></h4><h4 id='method.rfind-51' class="method hidden"><code id='rfind.v-51'>fn <a href='#method.rfind-51' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#97-101' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-51' class='impl'><code class='in-band'>impl<I> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Skip.html" title="struct core::iter::Skip">Skip</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../core/iter/trait.ExactSizeIterator.html" title="trait core::iter::ExactSizeIterator">ExactSizeIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-51' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1491-1515' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-51' class="method hidden"><code id='next_back.v-52'>fn <a href='#method.next_back-51' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1492-1498' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-52' class="method hidden"><code id='try_rfold.v-52'>fn <a href='#method.try_rfold-52' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1500-1514' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-52' class="method"><code id='nth_back.v-52'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfold-52' class="method"><code id='rfold.v-52'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-52' class="method"><code id='rfind.v-52'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-52' class='impl'><code class='in-band'>impl<I, U> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Flatten.html" title="struct core::iter::Flatten">Flatten</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> U: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>: <a class="trait" href="../../core/iter/trait.IntoIterator.html" title="trait core::iter::IntoIterator">IntoIterator</a><IntoIter = U, Item = U::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>>, </span></code><a href='#impl-DoubleEndedIterator-52' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#164-184' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-52' class="method hidden"><code id='next_back.v-53'>fn <a href='#method.next_back-52' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><U::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#169' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-53' class="method hidden"><code id='try_rfold.v-53'>fn <a href='#method.try_rfold-53' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#172-176' title='goto source code'>[src]</a></h4><h4 id='method.rfold-53' class="method hidden"><code id='rfold.v-53'>fn <a href='#method.rfold-53' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#179-183' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-53' class="method"><code id='nth_back.v-53'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-53' class="method"><code id='rfind.v-53'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-53' class='impl'><code class='in-band'>impl<I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, F> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Inspect.html" title="struct core::iter::Inspect">Inspect</a><I, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>), </span></code><a href='#impl-DoubleEndedIterator-53' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1981-2005' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-53' class="method hidden"><code id='next_back.v-54'>fn <a href='#method.next_back-53' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1985-1988' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-54' class="method hidden"><code id='try_rfold.v-54'>fn <a href='#method.try_rfold-54' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1991-1996' title='goto source code'>[src]</a></h4><h4 id='method.rfold-54' class="method hidden"><code id='rfold.v-54'>fn <a href='#method.rfold-54' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#1999-2004' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-54' class="method"><code id='nth_back.v-54'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-54' class="method"><code id='rfind.v-54'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-54' class='impl'><code class='in-band'>impl<I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, P> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Filter.html" title="struct core::iter::Filter">Filter</a><I, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><a href='#impl-DoubleEndedIterator-54' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#736-767' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-54' class="method hidden"><code id='next_back.v-55'>fn <a href='#method.next_back-54' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#740-742' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-55' class="method hidden"><code id='try_rfold.v-55'>fn <a href='#method.try_rfold-55' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#745-754' title='goto source code'>[src]</a></h4><h4 id='method.rfold-55' class="method hidden"><code id='rfold.v-55'>fn <a href='#method.rfold-55' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/mod.rs.html#757-766' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-55' class="method"><code id='nth_back.v-55'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-55' class="method"><code id='rfind.v-55'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-55' class='impl'><code class='in-band'>impl<I: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, U, F> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.FlatMap.html" title="struct core::iter::FlatMap">FlatMap</a><I, U, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(I::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> U,<br> U: <a class="trait" href="../../core/iter/trait.IntoIterator.html" title="trait core::iter::IntoIterator">IntoIterator</a>,<br> U::<a class="type" href="../../core/iter/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::IntoIterator::IntoIter">IntoIter</a>: <a class="trait" href="../../core/iter/trait.DoubleEndedIterator.html" title="trait core::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><a href='#impl-DoubleEndedIterator-55' class='anchor'></a><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#69-90' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-55' class="method hidden"><code id='next_back.v-56'>fn <a href='#method.next_back-55' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><U::<a class="type" href="../../core/iter/trait.IntoIterator.html#associatedtype.Item" title="type core::iter::IntoIterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#75' title='goto source code'>[src]</a></h4><h4 id='method.try_rfold-56' class="method hidden"><code id='try_rfold.v-56'>fn <a href='#method.try_rfold-56' class='fnname'>try_rfold</a><Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = Acc>, </span></code><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#78-82' title='goto source code'>[src]</a></h4><h4 id='method.rfold-56' class="method hidden"><code id='rfold.v-56'>fn <a href='#method.rfold-56' class='fnname'>rfold</a><Acc, Fold>(self, init: Acc, fold: Fold) -> Acc <span class="where fmt-newline">where<br> Fold: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(Acc, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> Acc, </span></code><a class='srclink' href='../../src/core/iter/adapters/flatten.rs.html#85-89' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-56' class="method"><code id='nth_back.v-56'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.rfind-56' class="method"><code id='rfind.v-56'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-56' class='impl'><code class='in-band'>impl<T> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Empty.html" title="struct core::iter::Empty">Empty</a><T></code><a href='#impl-DoubleEndedIterator-56' class='anchor'></a><a class='srclink' href='../../src/core/iter/sources.rs.html#222-226' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-56' class="method hidden"><code id='next_back.v-57'>fn <a href='#method.next_back-56' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class='srclink' href='../../src/core/iter/sources.rs.html#223-225' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-57' class="method"><code id='nth_back.v-57'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-57' class="method"><code id='try_rfold.v-57'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-57' class="method"><code id='rfold.v-57'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-57' class="method"><code id='rfind.v-57'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-57' class='impl'><code class='in-band'>impl<T> DoubleEndedIterator for <a class="struct" href="../../core/iter/struct.Once.html" title="struct core::iter::Once">Once</a><T></code><a href='#impl-DoubleEndedIterator-57' class='anchor'></a><a class='srclink' href='../../src/core/iter/sources.rs.html#303-307' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-57' class="method hidden"><code id='next_back.v-58'>fn <a href='#method.next_back-57' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class='srclink' href='../../src/core/iter/sources.rs.html#304-306' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-58' class="method"><code id='nth_back.v-58'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-58' class="method"><code id='try_rfold.v-58'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-58' class="method"><code id='rfold.v-58'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-58' class="method"><code id='rfind.v-58'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div><h3 id='impl-DoubleEndedIterator-58' class='impl'><code class='in-band'>impl<T> DoubleEndedIterator for core::result::<a class="struct" href="../../core/result/struct.IntoIter.html" title="struct core::result::IntoIter">IntoIter</a><T></code><a href='#impl-DoubleEndedIterator-58' class='anchor'></a><a class='srclink' href='../../src/core/result.rs.html#1171-1174' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-58' class="method hidden"><code id='next_back.v-59'>fn <a href='#method.next_back-58' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class='srclink' href='../../src/core/result.rs.html#1173' title='goto source code'>[src]</a></h4><h4 id='method.nth_back-59' class="method"><code id='nth_back.v-59'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.nth_back' class='fnname'>nth_back</a>(&mut self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>></code><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#117-123' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>iter_nth_back</code> <a href="https://github.com/rust-lang/rust/issues/56995">#56995</a>)</div></div><h4 id='method.try_rfold-59' class="method"><code id='try_rfold.v-59'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.try_rfold' class='fnname'>try_rfold</a><B, F, R>(&mut self, init: B, f: F) -> R <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../core/ops/trait.Try.html" title="trait core::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#159-170' title='goto source code'>[src]</a></h4><h4 id='method.rfold-59' class="method"><code id='rfold.v-59'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> F: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#225-231' title='goto source code'>[src]</a></h4><h4 id='method.rfind-59' class="method"><code id='rfind.v-59'>fn <a href='../../core/iter/trait.DoubleEndedIterator.html#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> P: <a class="trait" href="../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../core/iter/trait.Iterator.html#associatedtype.Item" title="type core::iter::Iterator::Item">Item</a>) -> bool, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div><a class='srclink' href='../../src/core/iter/traits/double_ended.rs.html#277-286' title='goto source code'>[src]</a></h4></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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