mentat/tokio_io/io/fn.read_exact.html
2018-08-22 17:04:13 +00:00

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<h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>tokio_io</a>::<wbr><a href='index.html'>io</a>::<wbr><a class="fn" href=''>read_exact</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust fn'>pub fn read_exact&lt;A, T&gt;(a: A, buf: T) -&gt; <a class="struct" href="../../tokio_io/io/struct.ReadExact.html" title="struct tokio_io::io::ReadExact">ReadExact</a>&lt;A, T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../tokio_io/trait.AsyncRead.html" title="trait tokio_io::AsyncRead">AsyncRead</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsMut.html" title="trait core::convert::AsMut">AsMut</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>&gt;,&nbsp;</span></pre><div class='docblock'><p>Creates a future which will read exactly enough bytes to fill <code>buf</code>,
returning an error if EOF is hit sooner.</p>
<p>The returned future will resolve to both the I/O stream as well as the
buffer once the read operation is completed.</p>
<p>In the case of an error the buffer and the object will be discarded, with
the error yielded. In the case of success the object will be destroyed and
the buffer will be returned, with all data read from the stream appended to
the buffer.</p>
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