<!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 `std`."><meta name="keywords" content="rust, rustlang, rust-lang, DoubleEndedIterator"><title>std::iter::DoubleEndedIterator - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></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='../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.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.try_rfold">try_rfold</a><a href="#method.rfold">rfold</a><a href="#method.rfind">rfind</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>std</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="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>std</a>::<wbr><a href='index.html'>iter</a>::<wbr><a class="trait" href=''>DoubleEndedIterator</a></span><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.rs.html#397-583' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait DoubleEndedIterator: <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> {
fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>>;
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> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../std/ops/trait.Try.html" title="trait std::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> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::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="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>><br> <span class="where">where<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> <a class="primitive" href="../primitive.bool.html">bool</a></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>
<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>
<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'><span id='next_back.v' class='invisible'><code>fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>></code></span></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>
<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='provided-methods' class='small-section-header'>
Provided Methods<a href='#provided-methods' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='method.try_rfold' class='method'><span id='try_rfold.v' class='invisible'><code>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> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> R,<br> R: <a class="trait" href="../../std/ops/trait.Try.html" title="trait std::ops::Try">Try</a><Ok = B>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div></span></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-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<p>Basic usage:</p>
<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>
<p>Short-circuiting:</p>
<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><h3 id='method.rfold' class='method'><span id='rfold.v' class='invisible'><code>fn <a href='#method.rfold' class='fnname'>rfold</a><B, F>(self, accum: B, f: F) -> B <span class="where fmt-newline">where<br> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(B, Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> B, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div></span></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-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<p>Basic usage:</p>
<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>
<p>This example builds a string, starting with an initial value
and continuing with each element from the back until the front:</p>
<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><h3 id='method.rfind' class='method'><span id='rfind.v' class='invisible'><code>fn <a href='#method.rfind' class='fnname'>rfind</a><P>(&mut self, predicate: P) -> <a class="enum" href="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(&Self::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> <a class="primitive" href="../primitive.bool.html">bool</a>, </span></code><div class='since' title='Stable since Rust version 1.27.0'>1.27.0</div></span></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-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<p>Basic usage:</p>
<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>
<p>Stopping at the first <code>true</code>:</p>
<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>
<h2 id='implementors' class='small-section-header'>
Implementors<a href='#implementors' class='anchor'></a>
</h2>
<ul class='item-list' id='implementors-list'>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Once.html" title="struct std::iter::Once">Once</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/sources.rs.html#315-319' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.ChunksMut.html" title="struct std::slice::ChunksMut">ChunksMut</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3614-3629' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::slice::<a class="struct" href="../../std/slice/struct.Iter.html" title="struct std::slice::Iter">Iter</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#2494-2543' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Rev.html" title="struct std::iter::Rev">Rev</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#458-479' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.SplitWhitespace.html" title="struct std::str::SplitWhitespace">SplitWhitespace</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#3947-3951' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Enumerate.html" title="struct std::iter::Enumerate">Enumerate</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.ExactSizeIterator.html" title="trait std::iter::ExactSizeIterator">ExactSizeIterator</a> + <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#1736-1774' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.Chunks.html" title="struct std::slice::Chunks">Chunks</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3497-3510' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T, P> DoubleEndedIterator for std::slice::<a class="struct" href="../../std/slice/struct.RSplit.html" title="struct std::slice::RSplit">RSplit</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<a class="primitive" href="../primitive.reference.html">&</a>T) -> <a class="primitive" href="../primitive.bool.html">bool</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3078-3083' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.RMatchIndices.html" title="struct std::str::RMatchIndices">RMatchIndices</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1011-1018' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, A> DoubleEndedIterator for std::option::<a class="struct" href="../../std/option/struct.IterMut.html" title="struct std::option::IterMut">IterMut</a><'a, A></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/option.rs.html#1134-1137' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, I, T> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Cloned.html" title="struct std::iter::Cloned">Cloned</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a><Item = <a class="primitive" href="../primitive.reference.html">&'a </a>T>,<br> T: 'a + <a class="trait" href="../../std/clone/trait.Clone.html" title="trait std::clone::Clone">Clone</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#544-562' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<A, B> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Chain.html" title="struct std::iter::Chain">Chain</a><A, B> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> B: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a><Item = <A as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#924-981' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for std::str::<a class="struct" href="../../std/str/struct.Split.html" title="struct std::str::Split">Split</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1001-1008' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I, U> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Flatten.html" title="struct std::iter::Flatten">Flatten</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> U: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> <I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>: <a class="trait" href="../../std/iter/trait.IntoIterator.html" title="trait std::iter::IntoIterator">IntoIterator</a>,<br> <<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a> as <a class="trait" href="../../std/iter/trait.IntoIterator.html" title="trait std::iter::IntoIterator">IntoIterator</a>>::<a class="type" href="../../std/iter/trait.IntoIterator.html#associatedtype.IntoIter" title="type std::iter::IntoIterator::IntoIter">IntoIter</a> == U,<br> <<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a> as <a class="trait" href="../../std/iter/trait.IntoIterator.html" title="trait std::iter::IntoIterator">IntoIterator</a>>::<a class="type" href="../../std/iter/trait.IntoIterator.html#associatedtype.Item" title="type std::iter::IntoIterator::Item">Item</a> == <U as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#2565-2585' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::result::<a class="struct" href="../../std/result/struct.Iter.html" title="struct std::result::Iter">Iter</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/result.rs.html#1033-1036' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.SplitTerminator.html" title="struct std::str::SplitTerminator">SplitTerminator</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1001-1008' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, I> DoubleEndedIterator for <a class="primitive" href="../primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/traits.rs.html#586-588' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::slice::<a class="struct" href="../../std/slice/struct.IterMut.html" title="struct std::slice::IterMut">IterMut</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#2494-2543' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.RSplitTerminator.html" title="struct std::str::RSplitTerminator">RSplitTerminator</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1011-1018' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.ExactChunks.html" title="struct std::slice::ExactChunks">ExactChunks</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3727-3738' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for std::result::<a class="struct" href="../../std/result/struct.IntoIter.html" title="struct std::result::IntoIter">IntoIter</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/result.rs.html#1120-1123' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Fuse.html" title="struct std::iter::Fuse">Fuse</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#2829-2864' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::result::<a class="struct" href="../../std/result/struct.IterMut.html" title="struct std::result::IterMut">IterMut</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/result.rs.html#1077-1080' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T, P> DoubleEndedIterator for std::slice::<a class="struct" href="../../std/slice/struct.Split.html" title="struct std::slice::Split">Split</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<a class="primitive" href="../primitive.reference.html">&</a>T) -> <a class="primitive" href="../primitive.bool.html">bool</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#2915-2929' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T, P> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.SplitMut.html" title="struct std::slice::SplitMut">SplitMut</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<a class="primitive" href="../primitive.reference.html">&</a>T) -> <a class="primitive" href="../primitive.bool.html">bool</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3013-3034' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.LinesAny.html" title="struct std::str::LinesAny">LinesAny</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1403-1408' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<A> DoubleEndedIterator for std::ops::<a class="struct" href="../../std/ops/struct.Range.html" title="struct std::ops::Range">Range</a><A> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/iter/trait.Step.html" title="trait std::iter::Step">Step</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#282-292' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<B, I, F> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Map.html" title="struct std::iter::Map">Map</a><I, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> B,<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#1350-1371' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.Lines.html" title="struct std::str::Lines">Lines</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1337-1342' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I, P> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Filter.html" title="struct std::iter::Filter">Filter</a><I, P> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(&<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> <a class="primitive" href="../primitive.bool.html">bool</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#1497-1533' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.RMatches.html" title="struct std::str::RMatches">RMatches</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1011-1018' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, A> DoubleEndedIterator for std::option::<a class="struct" href="../../std/option/struct.Iter.html" title="struct std::option::Iter">Iter</a><'a, A></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/option.rs.html#1089-1092' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<A> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Repeat.html" title="struct std::iter::Repeat">Repeat</a><A> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/clone/trait.Clone.html" title="trait std::clone::Clone">Clone</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/sources.rs.html#39-42' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.Bytes.html" title="struct std::str::Bytes">Bytes</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#797-809' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Empty.html" title="struct std::iter::Empty">Empty</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/sources.rs.html#234-238' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I, F> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Inspect.html" title="struct std::iter::Inspect">Inspect</a><I, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(&<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>),<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#3025-3049' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Fuse.html" title="struct std::iter::Fuse">Fuse</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../std/iter/trait.FusedIterator.html" title="trait std::iter::FusedIterator">FusedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#2921-2942' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<A> DoubleEndedIterator for std::option::<a class="struct" href="../../std/option/struct.IntoIter.html" title="struct std::option::IntoIter">IntoIter</a><A></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/option.rs.html#1171-1174' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<A> DoubleEndedIterator for <a class="struct" href="../../std/ops/struct.RangeInclusive.html" title="struct std::ops::RangeInclusive">RangeInclusive</a><A> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/iter/trait.Step.html" title="trait std::iter::Step">Step</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#422-460' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for std::str::<a class="struct" href="../../std/str/struct.RSplit.html" title="struct std::str::RSplit">RSplit</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1011-1018' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.MatchIndices.html" title="struct std::str::MatchIndices">MatchIndices</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1001-1008' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<B, I, F> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.FilterMap.html" title="struct std::iter::FilterMap">FilterMap</a><I, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> <a class="enum" href="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><B>,<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#1609-1643' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<A, B> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Zip.html" title="struct std::iter::Zip">Zip</a><A, B> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../std/iter/trait.ExactSizeIterator.html" title="trait std::iter::ExactSizeIterator">ExactSizeIterator</a>,<br> B: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../std/iter/trait.ExactSizeIterator.html" title="trait std::iter::ExactSizeIterator">ExactSizeIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#1035-1043' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.Windows.html" title="struct std::slice::Windows">Windows</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3377-3388' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.Chars.html" title="struct std::str::Chars">Chars</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#604-614' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I, U, F> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.FlatMap.html" title="struct std::iter::FlatMap">FlatMap</a><I, U, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>) -> U,<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>,<br> U: <a class="trait" href="../../std/iter/trait.IntoIterator.html" title="trait std::iter::IntoIterator">IntoIterator</a>,<br> <U as <a class="trait" href="../../std/iter/trait.IntoIterator.html" title="trait std::iter::IntoIterator">IntoIterator</a>>::<a class="type" href="../../std/iter/trait.IntoIterator.html#associatedtype.IntoIter" title="type std::iter::IntoIterator::IntoIter">IntoIter</a>: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#2476-2497' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.ExactChunksMut.html" title="struct std::slice::ExactChunksMut">ExactChunksMut</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3825-3838' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I> DoubleEndedIterator for <a class="struct" href="../../std/iter/struct.Skip.html" title="struct std::iter::Skip">Skip</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a> + <a class="trait" href="../../std/iter/trait.ExactSizeIterator.html" title="trait std::iter::ExactSizeIterator">ExactSizeIterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/mod.rs.html#2246-2270' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T, P> DoubleEndedIterator for <a class="struct" href="../../std/slice/struct.RSplitMut.html" title="struct std::slice::RSplitMut">RSplitMut</a><'a, T, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/ops/trait.FnMut.html" title="trait std::ops::FnMut">FnMut</a>(<a class="primitive" href="../primitive.reference.html">&</a>T) -> <a class="primitive" href="../primitive.bool.html">bool</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#3142-3149' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, P> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.Matches.html" title="struct std::str::Matches">Matches</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="../../std/str/pattern/trait.Pattern.html" title="trait std::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="../../std/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type std::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="../../std/str/pattern/trait.DoubleEndedSearcher.html" title="trait std::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#1001-1008' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl DoubleEndedIterator for <a class="struct" href="../../std/ascii/struct.EscapeDefault.html" title="struct std::ascii::EscapeDefault">EscapeDefault</a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/ascii.rs.html#132-136' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/str/struct.CharIndices.html" title="struct std::str::CharIndices">CharIndices</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#696-707' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for std::vec::<a class="struct" href="../../std/vec/struct.IntoIter.html" title="struct std::vec::IntoIter">IntoIter</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec.rs.html#2420-2442' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for std::collections::btree_map::<a class="struct" href="../../std/collections/btree_map/struct.Range.html" title="struct std::collections::btree_map::Range">Range</a><'a, K, V></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1563-1571' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for std::collections::vec_deque::<a class="struct" href="../../std/collections/vec_deque/struct.IntoIter.html" title="struct std::collections::vec_deque::IntoIter">IntoIter</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec_deque.rs.html#2202-2207' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::linked_list::<a class="struct" href="../../std/collections/linked_list/struct.Iter.html" title="struct std::collections::linked_list::Iter">Iter</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/linked_list.rs.html#823-838' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for <a class="struct" href="../../std/collections/btree_map/struct.Keys.html" title="struct std::collections::btree_map::Keys">Keys</a><'a, K, V></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1426-1430' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::vec::<a class="struct" href="../../std/vec/struct.Drain.html" title="struct std::vec::Drain">Drain</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec.rs.html#2521-2526' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, I> DoubleEndedIterator for <a class="struct" href="../../std/vec/struct.Splice.html" title="struct std::vec::Splice">Splice</a><'a, I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec.rs.html#2590-2594' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for <a class="struct" href="../../std/collections/btree_map/struct.ValuesMut.html" title="struct std::collections::btree_map::ValuesMut">ValuesMut</a><'a, K, V></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1513-1517' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<K, V> DoubleEndedIterator for std::collections::btree_map::<a class="struct" href="../../std/collections/btree_map/struct.IntoIter.html" title="struct std::collections::btree_map::IntoIter">IntoIter</a><K, V></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1364-1400' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::vec_deque::<a class="struct" href="../../std/collections/vec_deque/struct.Iter.html" title="struct std::collections::vec_deque::Iter">Iter</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec_deque.rs.html#2041-2058' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::vec_deque::<a class="struct" href="../../std/collections/vec_deque/struct.Drain.html" title="struct std::collections::vec_deque::Drain">Drain</a><'a, T> <span class="where fmt-newline">where<br> T: 'a, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec_deque.rs.html#2313-2318' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::binary_heap::<a class="struct" href="../../std/collections/binary_heap/struct.Iter.html" title="struct std::collections::binary_heap::Iter">Iter</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/binary_heap.rs.html#977-982' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<I> DoubleEndedIterator for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.DoubleEndedIterator.html" title="trait std::iter::DoubleEndedIterator">DoubleEndedIterator</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/boxed.rs.html#567-571' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for <a class="struct" href="../../std/collections/btree_map/struct.RangeMut.html" title="struct std::collections::btree_map::RangeMut">RangeMut</a><'a, K, V></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1664-1672' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for std::collections::btree_map::<a class="struct" href="../../std/collections/btree_map/struct.IterMut.html" title="struct std::collections::btree_map::IterMut">IterMut</a><'a, K, V> <span class="where fmt-newline">where<br> K: 'a,<br> V: 'a, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1258-1267' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::linked_list::<a class="struct" href="../../std/collections/linked_list/struct.IterMut.html" title="struct std::collections::linked_list::IterMut">IterMut</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/linked_list.rs.html#872-887' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::btree_set::<a class="struct" href="../../std/collections/btree_set/struct.Range.html" title="struct std::collections::btree_set::Range">Range</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/set.rs.html#993-997' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::vec_deque::<a class="struct" href="../../std/collections/vec_deque/struct.IterMut.html" title="struct std::collections::vec_deque::IterMut">IterMut</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/vec_deque.rs.html#2130-2151' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for std::collections::btree_map::<a class="struct" href="../../std/collections/btree_map/struct.Iter.html" title="struct std::collections::btree_map::Iter">Iter</a><'a, K, V> <span class="where fmt-newline">where<br> K: 'a,<br> V: 'a, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1201-1210' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, K, V> DoubleEndedIterator for <a class="struct" href="../../std/collections/btree_map/struct.Values.html" title="struct std::collections::btree_map::Values">Values</a><'a, K, V></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/map.rs.html#1463-1467' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::binary_heap::<a class="struct" href="../../std/collections/binary_heap/struct.Drain.html" title="struct std::collections::binary_heap::Drain">Drain</a><'a, T> <span class="where fmt-newline">where<br> T: 'a, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/binary_heap.rs.html#1078-1083' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for std::collections::btree_set::<a class="struct" href="../../std/collections/btree_set/struct.IntoIter.html" title="struct std::collections::btree_set::IntoIter">IntoIter</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/set.rs.html#963-967' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for std::string::<a class="struct" href="../../std/string/struct.Drain.html" title="struct std::string::Drain">Drain</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/string.rs.html#2354-2359' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a, T> DoubleEndedIterator for std::collections::btree_set::<a class="struct" href="../../std/collections/btree_set/struct.Iter.html" title="struct std::collections::btree_set::Iter">Iter</a><'a, T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/btree/set.rs.html#938-942' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for std::collections::linked_list::<a class="struct" href="../../std/collections/linked_list/struct.IntoIter.html" title="struct std::collections::linked_list::IntoIter">IntoIter</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/linked_list.rs.html#1053-1058' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> DoubleEndedIterator for std::collections::binary_heap::<a class="struct" href="../../std/collections/binary_heap/struct.IntoIter.html" title="struct std::collections::binary_heap::IntoIter">IntoIter</a><T></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/binary_heap.rs.html#1032-1037' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl DoubleEndedIterator for <a class="struct" href="../../std/env/struct.Args.html" title="struct std::env::Args">Args</a></code><td><div class='out-of-band'><a class='srclink' href='../../src/std/env.rs.html#757-761' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl DoubleEndedIterator for <a class="struct" href="../../std/env/struct.ArgsOs.html" title="struct std::env::ArgsOs">ArgsOs</a></code><td><div class='out-of-band'><a class='srclink' href='../../src/std/env.rs.html#792-794' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for std::path::<a class="struct" href="../../std/path/struct.Iter.html" title="struct std::path::Iter">Iter</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/std/path.rs.html#901-905' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<'a> DoubleEndedIterator for <a class="struct" href="../../std/path/struct.Components.html" title="struct std::path::Components">Components</a><'a></code><td><div class='out-of-band'><a class='srclink' href='../../src/std/path.rs.html#964-1008' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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