212 lines
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212 lines
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<div class="sidebar-menu">☰</div>
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<p class='location'>Trait FromBuf</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.from_buf">from_buf</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-FromBuf">Vec<u8></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>bytes</a>::<wbr><a href='index.html'>buf</a></p><script>window.sidebarCurrent = {name: 'FromBuf', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>bytes</a>::<wbr><a href='index.html'>buf</a>::<wbr><a class="trait" href=''>FromBuf</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/bytes/buf/from_buf.rs.html#68-87' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait FromBuf {
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fn <a href='#tymethod.from_buf' class='fnname'>from_buf</a><T>(buf: T) -> Self<br> <span class="where">where<br> T: <a class="trait" href="../../bytes/buf/trait.IntoBuf.html" title="trait bytes::buf::IntoBuf">IntoBuf</a></span>;
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}</pre><div class='docblock'><p>Conversion from a <a href="trait.Buf.html"><code>Buf</code></a></p>
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<p>Implementing <code>FromBuf</code> for a type defines how it is created from a buffer.
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This is common for types which represent byte storage of some kind.</p>
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<p><a href="#method.from_buf"><code>FromBuf::from_buf</code></a> is rarely called explicitly, and it is instead used
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through <a href="trait.Buf.html#method.collect"><code>Buf::collect</code></a>. See <a href="trait.Buf.html#method.collect"><code>Buf::collect</code></a> documentation for more examples.</p>
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<p>See also <a href="trait.IntoBuf.html"><code>IntoBuf</code></a>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>Basic usage:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">bytes</span>::{<span class="ident">Bytes</span>, <span class="ident">IntoBuf</span>};
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<span class="kw">use</span> <span class="ident">bytes</span>::<span class="ident">buf</span>::<span class="ident">FromBuf</span>;
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<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Bytes</span>::<span class="ident">from</span>(<span class="kw-2">&</span><span class="string">b"hello world"</span>[..]).<span class="ident">into_buf</span>();
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<span class="kw">let</span> <span class="ident">vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">from_buf</span>(<span class="ident">buf</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">vec</span>, <span class="kw-2">&</span><span class="string">b"hello world"</span>[..]);</pre>
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<p>Using <a href="trait.Buf.html#method.collect"><code>Buf::collect</code></a> to implicitly use <code>FromBuf</code>:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">bytes</span>::{<span class="ident">Buf</span>, <span class="ident">Bytes</span>, <span class="ident">IntoBuf</span>};
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<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Bytes</span>::<span class="ident">from</span>(<span class="kw-2">&</span><span class="string">b"hello world"</span>[..]).<span class="ident">into_buf</span>();
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<span class="kw">let</span> <span class="ident">vec</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="ident">buf</span>.<span class="ident">collect</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">vec</span>, <span class="kw-2">&</span><span class="string">b"hello world"</span>[..]);</pre>
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<p>Implementing <code>FromBuf</code> for your type:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">bytes</span>::{<span class="ident">BufMut</span>, <span class="ident">Bytes</span>};
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<span class="kw">use</span> <span class="ident">bytes</span>::<span class="ident">buf</span>::{<span class="ident">IntoBuf</span>, <span class="ident">FromBuf</span>};
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<span class="comment">// A sample buffer, that's just a wrapper over Vec<u8></span>
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<span class="kw">struct</span> <span class="ident">MyBuffer</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>);
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<span class="kw">impl</span> <span class="ident">FromBuf</span> <span class="kw">for</span> <span class="ident">MyBuffer</span> {
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<span class="kw">fn</span> <span class="ident">from_buf</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>(<span class="ident">buf</span>: <span class="ident">B</span>) <span class="op">-></span> <span class="self">Self</span> <span class="kw">where</span> <span class="ident">B</span>: <span class="ident">IntoBuf</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
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<span class="ident">v</span>.<span class="ident">put</span>(<span class="ident">buf</span>.<span class="ident">into_buf</span>());
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<span class="ident">MyBuffer</span>(<span class="ident">v</span>)
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}
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}
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<span class="comment">// Now we can make a new buf</span>
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<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Bytes</span>::<span class="ident">from</span>(<span class="kw-2">&</span><span class="string">b"hello world"</span>[..]);
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<span class="comment">// And make a MyBuffer out of it</span>
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<span class="kw">let</span> <span class="ident">my_buf</span> <span class="op">=</span> <span class="ident">MyBuffer</span>::<span class="ident">from_buf</span>(<span class="ident">buf</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">my_buf</span>.<span class="number">0</span>, <span class="kw-2">&</span><span class="string">b"hello world"</span>[..]);</pre>
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</div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.from_buf' class='method'><span id='from_buf.v' class='invisible'><code>fn <a href='#tymethod.from_buf' class='fnname'>from_buf</a><T>(buf: T) -> Self <span class="where fmt-newline">where<br> T: <a class="trait" href="../../bytes/buf/trait.IntoBuf.html" title="trait bytes::buf::IntoBuf">IntoBuf</a>, </span></code></span></h3><div class='docblock'><p>Creates a value from a buffer.</p>
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<p>See the <a href="#">type-level documentation</a> for more details.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<p>Basic usage:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">bytes</span>::{<span class="ident">Bytes</span>, <span class="ident">IntoBuf</span>};
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<span class="kw">use</span> <span class="ident">bytes</span>::<span class="ident">buf</span>::<span class="ident">FromBuf</span>;
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<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Bytes</span>::<span class="ident">from</span>(<span class="kw-2">&</span><span class="string">b"hello world"</span>[..]).<span class="ident">into_buf</span>();
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<span class="kw">let</span> <span class="ident">vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">from_buf</span>(<span class="ident">buf</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">vec</span>, <span class="kw-2">&</span><span class="string">b"hello world"</span>[..]);</pre>
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</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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<h3 id='impl-FromBuf' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../bytes/buf/trait.FromBuf.html" title="trait bytes::buf::FromBuf">FromBuf</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>></code><a href='#impl-FromBuf' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/bytes/buf/from_buf.rs.html#89-98' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_buf' class="method"><span id='from_buf.v-1' class='invisible'><code>fn <a href='#method.from_buf' class='fnname'>from_buf</a><T>(buf: T) -> Self <span class="where fmt-newline">where<br> T: <a class="trait" href="../../bytes/buf/trait.IntoBuf.html" title="trait bytes::buf::IntoBuf">IntoBuf</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/bytes/buf/from_buf.rs.html#90-97' title='goto source code'>[src]</a></span></h4>
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</div></span>
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<h2 id='implementors' class='small-section-header'>
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Implementors<a href='#implementors' class='anchor'></a>
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</h2>
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<ul class='item-list' id='implementors-list'>
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<li><div class='out-of-band'><a class='srclink' href='../../src/bytes/buf/from_buf.rs.html#100-106' title='goto source code'>[src]</a></div><code>impl FromBuf for <a class="struct" href="../../bytes/struct.Bytes.html" title="struct bytes::Bytes">Bytes</a></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/bytes/buf/from_buf.rs.html#108-117' title='goto source code'>[src]</a></div><code>impl FromBuf for <a class="struct" href="../../bytes/struct.BytesMut.html" title="struct bytes::BytesMut">BytesMut</a></code></li>
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</ul><script type="text/javascript" async
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src="../../implementors/bytes/buf/trait.FromBuf.js">
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Prefix searches with a type followed by a colon (e.g.
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Accepted types are: <code>fn</code>, <code>mod</code>,
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Search functions by type signature (e.g.
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