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<p class='location'><a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>io</a></p><script>window.sidebarCurrent = {name: 'copy', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Function <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>io</a>::<wbr><a class='fn' href=''>copy</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a id='src-4544' class='srclink' href='https://doc.rust-lang.org/nightly/std/io/util/fn.copy.html?gotosrc=4544' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn copy<R, W>(reader: &mut R, writer: &mut W) -> <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u64.html'>u64</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>> <span class='where'>where R: <a class='trait' href='../../../bitflags/__core/io/trait.Read.html' title='bitflags::__core::io::Read'>Read</a> + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a>, W: <a class='trait' href='../../../bitflags/__core/io/trait.Write.html' title='bitflags::__core::io::Write'>Write</a> + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></pre><span class="since">1.0.0</span><div class='docblock'><p>Copies the entire contents of a reader into a writer.</p>
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<p>This function will continuously read data from <code>reader</code> and then
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write it into <code>writer</code> in a streaming fashion until <code>reader</code>
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returns EOF.</p>
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<p>On success, the total number of bytes that were copied from
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<code>reader</code> to <code>writer</code> is returned.</p>
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<h1 id='errors' class='section-header'><a href='#errors'>Errors</a></h1>
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<p>This function will return an error immediately if any call to <code>read</code> or
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<code>write</code> returns an error. All instances of <code>ErrorKind::Interrupted</code> are
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handled by this function and the underlying operation is retried.</p>
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<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>reader</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>] <span class='op'>=</span> <span class='string'>b"hello"</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>writer</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>io</span>::<span class='ident'>copy</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>reader</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>writer</span>));
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<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>reader</span>, <span class='kw-2'>&</span><span class='ident'>writer</span>[..]);</pre>
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