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<h1 class='fqn'><span class='in-band'>Trait <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>io</a>::<wbr><a class='trait' href=''>Write</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a id='src-4862' class='srclink' href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html?gotosrc=4862' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Write {
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fn <a href='#tymethod.write' class='fnname'>write</a>(&mut self, buf: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a>) -> <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.usize.html'>usize</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>>;
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fn <a href='#tymethod.flush' class='fnname'>flush</a>(&mut self) -> <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.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>>;
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fn <a href='#method.write_all' class='fnname'>write_all</a>(&mut self, buf: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a>) -> <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.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>> { ... }
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fn <a href='#method.write_fmt' class='fnname'>write_fmt</a>(&mut self, fmt: <a class='struct' href='../../../bitflags/__core/fmt/struct.Arguments.html' title='bitflags::__core::fmt::Arguments'>Arguments</a>) -> <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.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>> { ... }
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fn <a href='#method.by_ref' class='fnname'>by_ref</a>(&mut self) -> &mut Self { ... }
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}</pre><div class='docblock'><p>A trait for objects which are byte-oriented sinks.</p>
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<p>Implementors of the <code>Write</code> trait are sometimes called 'writers'.</p>
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<p>Writers are defined by two required methods, <code>write()</code> and <code>flush()</code>:</p>
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<ul>
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<li><p>The <code>write()</code> method will attempt to write some data into the object,
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returning how many bytes were successfully written.</p></li>
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<li><p>The <code>flush()</code> method is useful for adaptors and explicit buffers
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themselves for ensuring that all buffered data has been pushed out to the
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'true sink'.</p></li>
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</ul>
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<p>Writers are intended to be composable with one another. Many implementors
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throughout <code>std::io</code> take and provide types which implement the <code>Write</code>
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trait.</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>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>create</span>(<span class='string'>"foo.txt"</span>));
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>buffer</span>.<span class='ident'>write</span>(<span class='string'>b"some bytes"</span>));</pre>
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</div>
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<h2 id='required-methods'>Required Methods</h2>
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<div class='methods'>
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<h3 id='tymethod.write' class='method stab '><code>fn <a href='#tymethod.write' class='fnname'>write</a>(&mut self, buf: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a>) -> <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.usize.html'>usize</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>></code></h3><div class='docblock'><p>Write a buffer into this object, returning how many bytes were written.</p>
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<p>This function will attempt to write the entire contents of <code>buf</code>, but
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the entire write may not succeed, or the write may also generate an
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error. A call to <code>write</code> represents <em>at most one</em> attempt to write to
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any wrapped object.</p>
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<p>Calls to <code>write</code> are not guaranteed to block waiting for data to be
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written, and a write which would otherwise block can be indicated through
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an <code>Err</code> variant.</p>
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<p>If the return value is <code>Ok(n)</code> then it must be guaranteed that
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<code>0 <= n <= buf.len()</code>. A return value of <code>0</code> typically means that the
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underlying object is no longer able to accept bytes and will likely not
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be able to in the future as well, or that the buffer provided is empty.</p>
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<h1 id='errors' class='section-header'><a href='#errors'>Errors</a></h1>
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<p>Each call to <code>write</code> may generate an I/O error indicating that the
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operation could not be completed. If an error is returned then no bytes
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in the buffer were written to this writer.</p>
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<p>It is <strong>not</strong> considered an error if the entire buffer could not be
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written to this writer.</p>
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<h1 id='examples-1' class='section-header'><a href='#examples-1'>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>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>create</span>(<span class='string'>"foo.txt"</span>));
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>buffer</span>.<span class='ident'>write</span>(<span class='string'>b"some bytes"</span>));</pre>
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</div><h3 id='tymethod.flush' class='method stab '><code>fn <a href='#tymethod.flush' class='fnname'>flush</a>(&mut self) -> <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.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>></code></h3><div class='docblock'><p>Flush this output stream, ensuring that all intermediately buffered
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contents reach their destination.</p>
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<h1 id='errors-1' class='section-header'><a href='#errors-1'>Errors</a></h1>
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<p>It is considered an error if not all bytes could be written due to
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I/O errors or EOF being reached.</p>
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<h1 id='examples-2' class='section-header'><a href='#examples-2'>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>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>::<span class='ident'>BufWriter</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='ident'>BufWriter</span>::<span class='ident'>new</span>(<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>create</span>(<span class='string'>"foo.txt"</span>)));
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>buffer</span>.<span class='ident'>write</span>(<span class='string'>b"some bytes"</span>));
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>buffer</span>.<span class='ident'>flush</span>());</pre>
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</div></div>
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<h2 id='provided-methods'>Provided Methods</h2>
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<div class='methods'>
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<h3 id='method.write_all' class='method stab '><code>fn <a href='#method.write_all' class='fnname'>write_all</a>(&mut self, buf: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a>) -> <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.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>></code></h3><div class='docblock'><p>Attempts to write an entire buffer into this write.</p>
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<p>This method will continuously call <code>write</code> while there is more data to
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write. This method will not return until the entire buffer has been
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successfully written or an error occurs. The first error generated from
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this method will be returned.</p>
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<h1 id='errors-2' class='section-header'><a href='#errors-2'>Errors</a></h1>
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<p>This function will return the first error that <code>write</code> returns.</p>
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<h1 id='examples-3' class='section-header'><a href='#examples-3'>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>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>create</span>(<span class='string'>"foo.txt"</span>));
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>buffer</span>.<span class='ident'>write_all</span>(<span class='string'>b"some bytes"</span>));</pre>
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</div><h3 id='method.write_fmt' class='method stab '><code>fn <a href='#method.write_fmt' class='fnname'>write_fmt</a>(&mut self, fmt: <a class='struct' href='../../../bitflags/__core/fmt/struct.Arguments.html' title='bitflags::__core::fmt::Arguments'>Arguments</a>) -> <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.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/io/struct.Error.html' title='bitflags::__core::io::Error'>Error</a>></code></h3><div class='docblock'><p>Writes a formatted string into this writer, returning any error
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encountered.</p>
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<p>This method is primarily used to interface with the
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<a href="../macro.format_args!.html"><code>format_args!</code></a> macro, but it is rare that this should
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explicitly be called. The <a href="../macro.write!.html"><code>write!</code></a> macro should be favored to
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invoke this method instead.</p>
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<p>This function internally uses the <a href="#method.write_all"><code>write_all</code></a> method on
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this trait and hence will continuously write data so long as no errors
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are received. This also means that partial writes are not indicated in
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this signature.</p>
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<h1 id='errors-3' class='section-header'><a href='#errors-3'>Errors</a></h1>
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<p>This function will return any I/O error reported while formatting.</p>
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<h1 id='examples-4' class='section-header'><a href='#examples-4'>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>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>create</span>(<span class='string'>"foo.txt"</span>));
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<span class='comment'>// this call</span>
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>buffer</span>, <span class='string'>"{:.*}"</span>, <span class='number'>2</span>, <span class='number'>1.234567</span>));
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<span class='comment'>// turns into this:</span>
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>buffer</span>.<span class='ident'>write_fmt</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"{:.*}"</span>, <span class='number'>2</span>, <span class='number'>1.234567</span>)));</pre>
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</div><h3 id='method.by_ref' class='method stab '><code>fn <a href='#method.by_ref' class='fnname'>by_ref</a>(&mut self) -> &mut Self</code></h3><div class='docblock'><p>Creates a "by reference" adaptor for this instance of <code>Write</code>.</p>
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<p>The returned adaptor also implements <code>Write</code> and will simply borrow this
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current writer.</p>
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<h1 id='examples-5' class='section-header'><a href='#examples-5'>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>::<span class='ident'>Write</span>;
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>create</span>(<span class='string'>"foo.txt"</span>));
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<span class='kw'>let</span> <span class='ident'>reference</span> <span class='op'>=</span> <span class='ident'>buffer</span>.<span class='ident'>by_ref</span>();
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<span class='comment'>// we can use reference just like our original buffer</span>
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<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>reference</span>.<span class='ident'>write_all</span>(<span class='string'>b"some bytes"</span>));</pre>
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</div></div>
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<h2 id='implementors'>Implementors</h2>
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<ul class='item-list' id='implementors-list'>
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<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/fs/struct.File.html' title='bitflags::__core::fs::File'>File</a></code></li>
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<li><code>impl<'a> Write for &'a <a class='struct' href='../../../bitflags/__core/fs/struct.File.html' title='bitflags::__core::fs::File'>File</a></code></li>
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<li><code>impl<W> Write for <a class='struct' href='../../../bitflags/__core/io/struct.BufWriter.html' title='bitflags::__core::io::BufWriter'>BufWriter</a><W> <span class='where'>where W: <a class='trait' href='../../../bitflags/__core/io/trait.Write.html' title='bitflags::__core::io::Write'>Write</a></span></code></li>
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<li><code>impl<W> Write for <a class='struct' href='../../../bitflags/__core/io/struct.LineWriter.html' title='bitflags::__core::io::LineWriter'>LineWriter</a><W> <span class='where'>where W: <a class='trait' href='../../../bitflags/__core/io/trait.Write.html' title='bitflags::__core::io::Write'>Write</a></span></code></li>
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<li><code>impl<'a> Write for <a class='struct' href='../../../bitflags/__core/io/struct.Cursor.html' title='bitflags::__core::io::Cursor'>Cursor</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&'a mut [</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a>></code></li>
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<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/io/struct.Cursor.html' title='bitflags::__core::io::Cursor'>Cursor</a><<a class='struct' href='../../../bitflags/__core/vec/struct.Vec.html' title='bitflags::__core::vec::Vec'>Vec</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a>>></code></li>
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<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/io/struct.Cursor.html' title='bitflags::__core::io::Cursor'>Cursor</a><<a class='struct' href='../../../bitflags/__core/boxed/struct.Box.html' title='bitflags::__core::boxed::Box'>Box</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a>>></code></li>
|
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<li><code>impl<'a, W> Write for &'a mut W <span class='where'>where 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></code></li>
|
||
<li><code>impl<W> Write for <a class='struct' href='../../../bitflags/__core/boxed/struct.Box.html' title='bitflags::__core::boxed::Box'>Box</a><W> <span class='where'>where 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></code></li>
|
||
<li><code>impl<'a> Write for <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&'a mut [</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>]</a></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/vec/struct.Vec.html' title='bitflags::__core::vec::Vec'>Vec</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.u8.html'>u8</a>></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/io/struct.Sink.html' title='bitflags::__core::io::Sink'>Sink</a></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/io/struct.Stdout.html' title='bitflags::__core::io::Stdout'>Stdout</a></code></li>
|
||
<li><code>impl<'a> Write for <a class='struct' href='../../../bitflags/__core/io/struct.StdoutLock.html' title='bitflags::__core::io::StdoutLock'>StdoutLock</a><'a></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/io/struct.Stderr.html' title='bitflags::__core::io::Stderr'>Stderr</a></code></li>
|
||
<li><code>impl<'a> Write for <a class='struct' href='../../../bitflags/__core/io/struct.StderrLock.html' title='bitflags::__core::io::StderrLock'>StderrLock</a><'a></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/net/struct.TcpStream.html' title='bitflags::__core::net::TcpStream'>TcpStream</a></code></li>
|
||
<li><code>impl<'a> Write for &'a <a class='struct' href='../../../bitflags/__core/net/struct.TcpStream.html' title='bitflags::__core::net::TcpStream'>TcpStream</a></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/os/ext/net/struct.UnixStream.html' title='bitflags::__core::os::ext::net::UnixStream'>UnixStream</a></code></li>
|
||
<li><code>impl<'a> Write for &'a <a class='struct' href='../../../bitflags/__core/os/ext/net/struct.UnixStream.html' title='bitflags::__core::os::ext::net::UnixStream'>UnixStream</a></code></li>
|
||
<li><code>impl Write for <a class='struct' href='../../../bitflags/__core/process/struct.ChildStdin.html' title='bitflags::__core::process::ChildStdin'>ChildStdin</a></code></li>
|
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</ul><script type="text/javascript" async
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