<!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 `Chain` struct in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, Chain"><title>std::io::Chain - 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 struct"><!--[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'>Struct Chain</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.into_inner">into_inner</a><a href="#method.get_ref">get_ref</a><a href="#method.get_mut">get_mut</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Read">Read</a><a href="#impl-BufRead">BufRead</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>io</a></p><script>window.sidebarCurrent = {name: 'Chain', ty: 'struct', 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'>Struct <a href='../index.html'>std</a>::<wbr><a href='index.html'>io</a>::<wbr><a class="struct" href=''>Chain</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/std/io/mod.rs.html#1649-1653' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Chain<T, U> { /* fields omitted */ }</pre></div><div class='docblock'><p>Adaptor to chain together two readers.</p>
<p>This struct is generally created by calling <a href="trait.Read.html#method.chain"><code>chain</code></a> on a reader.
Please see the documentation of <a href="trait.Read.html#method.chain"><code>chain</code></a> for more details.</p>
</div>
<h2 id='methods' class='small-section-header'>
Methods<a href='#methods' class='anchor'></a>
</h2>
<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T, U> <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1655-1728' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.into_inner' class="method"><span id='into_inner.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -> <a class="primitive" href="../primitive.tuple.html">(</a>T, U<a class="primitive" href="../primitive.tuple.html">)</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.20.0'>1.20.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1675-1677' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Consumes the <code>Chain</code>, returning the wrapped readers.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bar_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"bar.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">chain</span> <span class="op">=</span> <span class="ident">foo_file</span>.<span class="ident">chain</span>(<span class="ident">bar_file</span>);
<span class="kw">let</span> (<span class="ident">foo_file</span>, <span class="ident">bar_file</span>) <span class="op">=</span> <span class="ident">chain</span>.<span class="ident">into_inner</span>();
<span class="prelude-val">Ok</span>(())
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aio%3B%0Ause%20std%3A%3Aio%3A%3Aprelude%3A%3A*%3B%0Ause%20std%3A%3Afs%3A%3AFile%3B%0A%0Afn%20main()%20-%3E%20io%3A%3AResult%3C()%3E%20%7B%0A%20%20%20%20let%20mut%20foo_file%20%3D%20File%3A%3Aopen(%22foo.txt%22)%3F%3B%0A%20%20%20%20let%20mut%20bar_file%20%3D%20File%3A%3Aopen(%22bar.txt%22)%3F%3B%0A%0A%20%20%20%20let%20chain%20%3D%20foo_file.chain(bar_file)%3B%0A%20%20%20%20let%20(foo_file%2C%20bar_file)%20%3D%20chain.into_inner()%3B%0A%20%20%20%20Ok(())%0A%7D">Run</a></pre>
</div><h4 id='method.get_ref' class="method"><span id='get_ref.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.get_ref' class='fnname'>get_ref</a>(&self) -> <a class="primitive" href="../primitive.tuple.html">(</a><a class="primitive" href="../primitive.reference.html">&</a>T, <a class="primitive" href="../primitive.reference.html">&</a>U<a class="primitive" href="../primitive.tuple.html">)</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.20.0'>1.20.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1698-1700' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Gets references to the underlying readers in this <code>Chain</code>.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bar_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"bar.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">chain</span> <span class="op">=</span> <span class="ident">foo_file</span>.<span class="ident">chain</span>(<span class="ident">bar_file</span>);
<span class="kw">let</span> (<span class="ident">foo_file</span>, <span class="ident">bar_file</span>) <span class="op">=</span> <span class="ident">chain</span>.<span class="ident">get_ref</span>();
<span class="prelude-val">Ok</span>(())
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aio%3B%0Ause%20std%3A%3Aio%3A%3Aprelude%3A%3A*%3B%0Ause%20std%3A%3Afs%3A%3AFile%3B%0A%0Afn%20main()%20-%3E%20io%3A%3AResult%3C()%3E%20%7B%0A%20%20%20%20let%20mut%20foo_file%20%3D%20File%3A%3Aopen(%22foo.txt%22)%3F%3B%0A%20%20%20%20let%20mut%20bar_file%20%3D%20File%3A%3Aopen(%22bar.txt%22)%3F%3B%0A%0A%20%20%20%20let%20chain%20%3D%20foo_file.chain(bar_file)%3B%0A%20%20%20%20let%20(foo_file%2C%20bar_file)%20%3D%20chain.get_ref()%3B%0A%20%20%20%20Ok(())%0A%7D">Run</a></pre>
</div><h4 id='method.get_mut' class="method"><span id='get_mut.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut self) -> <a class="primitive" href="../primitive.tuple.html">(</a><a class="primitive" href="../primitive.reference.html">&mut </a>T, <a class="primitive" href="../primitive.reference.html">&mut </a>U<a class="primitive" href="../primitive.tuple.html">)</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.20.0'>1.20.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1725-1727' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Gets mutable references to the underlying readers in this <code>Chain</code>.</p>
<p>Care should be taken to avoid modifying the internal I/O state of the
underlying readers as doing so may corrupt the internal state of this
<code>Chain</code>.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bar_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"bar.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chain</span> <span class="op">=</span> <span class="ident">foo_file</span>.<span class="ident">chain</span>(<span class="ident">bar_file</span>);
<span class="kw">let</span> (<span class="ident">foo_file</span>, <span class="ident">bar_file</span>) <span class="op">=</span> <span class="ident">chain</span>.<span class="ident">get_mut</span>();
<span class="prelude-val">Ok</span>(())
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aio%3B%0Ause%20std%3A%3Aio%3A%3Aprelude%3A%3A*%3B%0Ause%20std%3A%3Afs%3A%3AFile%3B%0A%0Afn%20main()%20-%3E%20io%3A%3AResult%3C()%3E%20%7B%0A%20%20%20%20let%20mut%20foo_file%20%3D%20File%3A%3Aopen(%22foo.txt%22)%3F%3B%0A%20%20%20%20let%20mut%20bar_file%20%3D%20File%3A%3Aopen(%22bar.txt%22)%3F%3B%0A%0A%20%20%20%20let%20mut%20chain%20%3D%20foo_file.chain(bar_file)%3B%0A%20%20%20%20let%20(foo_file%2C%20bar_file)%20%3D%20chain.get_mut()%3B%0A%20%20%20%20Ok(())%0A%7D">Run</a></pre>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<div id='implementations-list'><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: <a class="trait" href="../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a>, U: <a class="trait" href="../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a>> <a class="trait" href="../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.16.0'>1.16.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1731-1738' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../std/fmt/type.Result.html" title="type std::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1732-1737' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="../../std/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Read' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>, U: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>> <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code><a href='#impl-Read' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1741-1760' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.read' class="method"><span id='read.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#tymethod.read' class='fnname'>read</a>(&mut self, buf: <a class="primitive" href="../primitive.slice.html">&mut [</a><a class="primitive" href="../primitive.u8.html">u8</a><a class="primitive" href="../primitive.slice.html">]</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1742-1750' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Pull some bytes from this source into the specified buffer, returning how many bytes were read. <a href="../../std/io/trait.Read.html#tymethod.read">Read more</a></p>
</div><h4 id='method.initializer' class="method"><span id='initializer.v' class='invisible'><table class='table-display'><tbody><tr><td><code>unsafe fn <a href='../../std/io/trait.Read.html#method.initializer' class='fnname'>initializer</a>(&self) -> <a class="struct" href="../../std/io/struct.Initializer.html" title="struct std::io::Initializer">Initializer</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1752-1759' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>read_initializer </code><a href="https://github.com/rust-lang/rust/issues/42788">#42788</a>)</div></div><div class='docblock'><p>Determines if this <code>Read</code>er can work with buffers of uninitialized memory. <a href="../../std/io/trait.Read.html#method.initializer">Read more</a></p>
</div><h4 id='method.read_to_end' class="method"><span id='read_to_end.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.read_to_end' class='fnname'>read_to_end</a>(&mut self, buf: &mut <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#604-606' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read all bytes until EOF in this source, placing them into <code>buf</code>. <a href="../../std/io/trait.Read.html#method.read_to_end">Read more</a></p>
</div><h4 id='method.read_to_string' class="method"><span id='read_to_string.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.read_to_string' class='fnname'>read_to_string</a>(&mut self, buf: &mut <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#647-658' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read all bytes until EOF in this source, appending them to <code>buf</code>. <a href="../../std/io/trait.Read.html#method.read_to_string">Read more</a></p>
</div><h4 id='method.read_exact' class="method"><span id='read_exact.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.read_exact' class='fnname'>read_exact</a>(&mut self, buf: <a class="primitive" href="../primitive.slice.html">&mut [</a><a class="primitive" href="../primitive.u8.html">u8</a><a class="primitive" href="../primitive.slice.html">]</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.unit.html">()</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.6.0'>1.6.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#710-725' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read the exact number of bytes required to fill <code>buf</code>. <a href="../../std/io/trait.Read.html#method.read_exact">Read more</a></p>
</div><h4 id='method.by_ref' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="../primitive.reference.html">&'a mut </a>I</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="../primitive.reference.html">&'a mut </a>I</h3><code class="content"><span class="where fmt-newline">impl<'a, I> <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> 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.Iterator.html" title="trait std::iter::Iterator">Iterator</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</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>;</span><span class="where fmt-newline">impl<'a, R: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="../primitive.reference.html">&'a mut </a>R</span><span class="where fmt-newline">impl<'a, W: <a class="trait" href="../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="../primitive.reference.html">&'a mut </a>W</span></code></div></div><span id='by_ref.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.by_ref' class='fnname'>by_ref</a>(&mut self) -> <a class="primitive" href="../primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#762' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates a "by reference" adaptor for this instance of <code>Read</code>. <a href="../../std/io/trait.Read.html#method.by_ref">Read more</a></p>
</div><h4 id='method.bytes' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a><R></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a><R></h3><code class="content"><span class="where fmt-newline">impl<R: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>> <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="struct" href="../../std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a><R></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.u8.html">u8</a>>;</span></code></div></div><span id='bytes.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.bytes' class='fnname'>bytes</a>(self) -> <a class="struct" href="../../std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#799-801' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Transforms this <code>Read</code> instance to an [<code>Iterator</code>] over its bytes. <a href="../../std/io/trait.Read.html#method.bytes">Read more</a></p>
</div><h4 id='method.chars' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a><R></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a><R></h3><code class="content"><span class="where fmt-newline">impl<R: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>> <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="struct" href="../../std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a><R></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a><<a class="primitive" href="../primitive.char.html">char</a>, <a class="enum" href="../../std/io/enum.CharsError.html" title="enum std::io::CharsError">CharsError</a>>;</span></code></div></div><span id='chars.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.chars' class='fnname'>chars</a>(self) -> <a class="struct" href="../../std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#846-848' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab deprecated'>Deprecated since 1.27.0<p>: Use str::from_utf8 instead:
https://doc.rust-lang.org/nightly/std/str/struct.Utf8Error.html#examples</p>
</div><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>io </code><a href="https://github.com/rust-lang/rust/issues/27802">#27802</a>)</summary><p>the semantics of a partial read/write of where errors happen is currently unclear and may change</p>
</details></div></div><div class='docblock'><p>Transforms this <code>Read</code> instance to an [<code>Iterator</code>] over [<code>char</code>]s. <a href="../../std/io/trait.Read.html#method.chars">Read more</a></p>
</div><h4 id='method.chain' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></h3><code class="content"><span class="where fmt-newline">impl<T: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>, U: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>> <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></span></code></div></div><span id='chain.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.chain' class='fnname'>chain</a><R: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>>(self, next: R) -> <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><Self, R> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#881-883' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates an adaptor which will chain this stream with another. <a href="../../std/io/trait.Read.html#method.chain">Read more</a></p>
</div><h4 id='method.take' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/io/struct.Take.html" title="struct std::io::Take">Take</a><T></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/io/struct.Take.html" title="struct std::io::Take">Take</a><T></h3><code class="content"><span class="where fmt-newline">impl<T: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>> <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="../../std/io/struct.Take.html" title="struct std::io::Take">Take</a><T></span></code></div></div><span id='take.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.Read.html#method.take' class='fnname'>take</a>(self, limit: <a class="primitive" href="../primitive.u64.html">u64</a>) -> <a class="struct" href="../../std/io/struct.Take.html" title="struct std::io::Take">Take</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#917-919' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates an adaptor which will read at most <code>limit</code> bytes from it. <a href="../../std/io/trait.Read.html#method.take">Read more</a></p>
</div></div><h3 id='impl-BufRead' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a>, U: <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a>> <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code><a href='#impl-BufRead' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1763-1781' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fill_buf' class="method"><span id='fill_buf.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.BufRead.html#tymethod.fill_buf' class='fnname'>fill_buf</a>(&mut self) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.slice.html">&[</a><a class="primitive" href="../primitive.u8.html">u8</a><a class="primitive" href="../primitive.slice.html">]</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1764-1772' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Fills the internal buffer of this object, returning the buffer contents. <a href="../../std/io/trait.BufRead.html#tymethod.fill_buf">Read more</a></p>
</div><h4 id='method.consume' class="method"><span id='consume.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.BufRead.html#tymethod.consume' class='fnname'>consume</a>(&mut self, amt: <a class="primitive" href="../primitive.usize.html">usize</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1774-1780' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Tells this buffer that <code>amt</code> bytes have been consumed from the buffer, so they should no longer be returned in calls to <code>read</code>. <a href="../../std/io/trait.BufRead.html#tymethod.consume">Read more</a></p>
</div><h4 id='method.read_until' class="method"><span id='read_until.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.BufRead.html#method.read_until' class='fnname'>read_until</a>(&mut self, byte: <a class="primitive" href="../primitive.u8.html">u8</a>, buf: &mut <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1498-1500' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read all bytes into <code>buf</code> until the delimiter <code>byte</code> or EOF is reached. <a href="../../std/io/trait.BufRead.html#method.read_until">Read more</a></p>
</div><h4 id='method.read_line' class="method"><span id='read_line.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.BufRead.html#method.read_line' class='fnname'>read_line</a>(&mut self, buf: &mut <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1557-1562' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. <a href="../../std/io/trait.BufRead.html#method.read_line">Read more</a></p>
</div><h4 id='method.split' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/io/struct.Split.html" title="struct std::io::Split">Split</a><B></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/io/struct.Split.html" title="struct std::io::Split">Split</a><B></h3><code class="content"><span class="where fmt-newline">impl<B: <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a>> <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="struct" href="../../std/io/struct.Split.html" title="struct std::io::Split">Split</a><B></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>>>;</span></code></div></div><span id='split.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.BufRead.html#method.split' class='fnname'>split</a>(self, byte: <a class="primitive" href="../primitive.u8.html">u8</a>) -> <a class="struct" href="../../std/io/struct.Split.html" title="struct std::io::Split">Split</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1598-1600' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns an iterator over the contents of this reader split on the byte <code>byte</code>. <a href="../../std/io/trait.BufRead.html#method.split">Read more</a></p>
</div><h4 id='method.lines' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/io/struct.Lines.html" title="struct std::io::Lines">Lines</a><B></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/io/struct.Lines.html" title="struct std::io::Lines">Lines</a><B></h3><code class="content"><span class="where fmt-newline">impl<B: <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a>> <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="struct" href="../../std/io/struct.Lines.html" title="struct std::io::Lines">Lines</a><B></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a>>;</span></code></div></div><span id='lines.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../std/io/trait.BufRead.html#method.lines' class='fnname'>lines</a>(self) -> <a class="struct" href="../../std/io/struct.Lines.html" title="struct std::io::Lines">Lines</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1637-1639' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns an iterator over the lines of this reader. <a href="../../std/io/trait.BufRead.html#method.lines">Read more</a></p>
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Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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