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<!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 `MemPool` struct in crate `smithay_client_toolkit`."><meta name="keywords" content="rust, rustlang, rust-lang, MemPool"><title>smithay_client_toolkit::utils::MemPool - 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></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><p class='location'>Struct MemPool</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.resize">resize</a><a href="#method.buffer">buffer</a><a href="#method.is_used">is_used</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Drop">Drop</a><a href="#impl-Write">Write</a><a href="#impl-Seek">Seek</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'>smithay_client_toolkit</a>::<wbr><a href='index.html'>utils</a></p><script>window.sidebarCurrent = {name: 'MemPool', 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'>smithay_client_toolkit</a>::<wbr><a href='index.html'>utils</a>::<wbr><a class="struct" href=''>MemPool</a></span><span class='out-of-band'><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/smithay_client_toolkit/utils/mempool.rs.html#102-108' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct MemPool { /* fields omitted */ }</pre></div><div class='docblock'><p>A wrapper handling an SHM memory pool backed by a shared memory file</p>
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<p>This wrapper handles for you the creation of the shared memory file and its synchronisation
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with the protocol.</p>
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<p>Mempool internally tracks the lifetime of all buffers created from it and to ensure that
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this buffer count is correct all buffers must be attached to a surface. Once a buffer is attached to
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a surface it must be immediately commited to that surface before another buffer is attached.</p>
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<p>Mempool will also handle the destruction of buffers and as such the <code>destroy()</code> method should not
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be used on buffers created from Mempool.</p>
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<p>Overwriting the contents of the memory pool before it is completely freed may cause graphical
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glitches due to the possible corruption of data while the compositor is reading it.</p>
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<p>Mempool requires an implementation that will be called when the pool becomes free, this
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happens when all the pools buffers are released by the server.</p>
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</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 <a class="struct" href="../../smithay_client_toolkit/utils/struct.MemPool.html" title="struct smithay_client_toolkit::utils::MemPool">MemPool</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#110-199' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a><Impl>(shm: &<a class="struct" href="../../smithay_client_toolkit/reexports/client/struct.Proxy.html" title="struct smithay_client_toolkit::reexports::client::Proxy">Proxy</a><<a class="struct" href="../../smithay_client_toolkit/reexports/client/protocol/wl_shm/struct.WlShm.html" title="struct smithay_client_toolkit::reexports::client::protocol::wl_shm::WlShm">WlShm</a>>, implementation: Impl) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="struct" href="../../smithay_client_toolkit/utils/struct.MemPool.html" title="struct smithay_client_toolkit::utils::MemPool">MemPool</a>> <span class="where fmt-newline">where<br> Impl: <a class="trait" href="../../smithay_client_toolkit/reexports/client/commons/trait.Implementation.html" title="trait smithay_client_toolkit::reexports::client::commons::Implementation">Implementation</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#112-132' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a new memory pool associated with given shm</p>
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</div><h4 id='method.resize' class="method"><span id='resize.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.resize' class='fnname'>resize</a>(&mut self, newsize: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#145-152' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Resize the memory pool</p>
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<p>This affect the size as it is seen by the wayland server. Even
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if you extend the temporary file size by writing to it, you need to
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call this method otherwise the server won't see the new size.</p>
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<p>Memory pools can only be extented, as such this method wll do nothing
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if the requested new size is smaller than the current size.</p>
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<p>This method allows you to ensure the underlying pool is large enough to
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hold what you want to write to it.</p>
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</div><h4 id='method.buffer' class="method"><span id='buffer.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.buffer' class='fnname'>buffer</a>(<br> &self, <br> offset: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, <br> width: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, <br> height: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, <br> stride: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, <br> format: <a class="enum" href="../../smithay_client_toolkit/reexports/client/protocol/wl_shm/enum.Format.html" title="enum smithay_client_toolkit::reexports::client::protocol::wl_shm::Format">Format</a><br>) -> <a class="struct" href="../../smithay_client_toolkit/reexports/client/struct.Proxy.html" title="struct smithay_client_toolkit::reexports::client::Proxy">Proxy</a><<a class="struct" href="../../smithay_client_toolkit/reexports/client/protocol/wl_buffer/struct.WlBuffer.html" title="struct smithay_client_toolkit::reexports::client::protocol::wl_buffer::WlBuffer">WlBuffer</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#166-192' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a new buffer to this pool</p>
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<p>The parameters are:</p>
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<ul>
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<li><code>offset</code>: the offset (in bytes) from the beggining of the pool at which this
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buffer starts</li>
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<li><code>width</code>: the width of this buffer (in pixels)</li>
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<li><code>height</code>: the height of this buffer (in pixels)</li>
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<li><code>stride</code>: distance (in bytes) between the beggining of a row and the next one</li>
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<li><code>format</code>: the encoding format of the pixels. Using a format that was not
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advertized to the <code>wl_shm</code> global by the server is a protocol error and will
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terminate your connexion</li>
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</ul>
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</div><h4 id='method.is_used' class="method"><span id='is_used.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.is_used' class='fnname'>is_used</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#196-198' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Retuns true if the pool contains buffers that are currently in use by the server otherwise it returns
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false</p>
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</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-Drop' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="../../smithay_client_toolkit/utils/struct.MemPool.html" title="struct smithay_client_toolkit::utils::MemPool">MemPool</a></code><a href='#impl-Drop' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#201-205' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.drop' class="method"><span id='drop.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&mut self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#202-204' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Executes the destructor for this type. <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
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</div></div><h3 id='impl-Write' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="struct" href="../../smithay_client_toolkit/utils/struct.MemPool.html" title="struct smithay_client_toolkit::utils::MemPool">MemPool</a></code><a href='#impl-Write' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#207-214' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.write' class="method"><span id='write.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.write' class='fnname'>write</a>(&mut self, buf: <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>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#208-210' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Write a buffer into this object, returning how many bytes were written. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.write">Read more</a></p>
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</div><h4 id='method.flush' class="method"><span id='flush.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.flush' class='fnname'>flush</a>(&mut self) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#211-213' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Flush this output stream, ensuring that all intermediately buffered contents reach their destination. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.flush">Read more</a></p>
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</div><h4 id='method.write_all' class="method"><span id='write_all.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_all' class='fnname'>write_all</a>(&mut self, buf: <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>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#1109-1120' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Attempts to write an entire buffer into this write. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_all">Read more</a></p>
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</div><h4 id='method.write_fmt' class="method"><span id='write_fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_fmt' class='fnname'>write_fmt</a>(&mut self, fmt: <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Arguments.html" title="struct core::fmt::Arguments">Arguments</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#1161-1193' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Writes a formatted string into this writer, returning any error encountered. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_fmt">Read more</a></p>
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</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="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>W</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>W</h3><code class="content"><span class="where fmt-newline">impl<'a, W> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>W <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<'a, R> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<'a, I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='by_ref.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.by_ref' class='fnname'>by_ref</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#1217' 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>Write</code>. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.by_ref">Read more</a></p>
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</div></div><h3 id='impl-Seek' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Seek.html" title="trait std::io::Seek">Seek</a> for <a class="struct" href="../../smithay_client_toolkit/utils/struct.MemPool.html" title="struct smithay_client_toolkit::utils::MemPool">MemPool</a></code><a href='#impl-Seek' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#216-220' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.seek' class="method"><span id='seek.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#tymethod.seek' class='fnname'>seek</a>(&mut self, pos: <a class="enum" href="https://doc.rust-lang.org/nightly/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/smithay_client_toolkit/utils/mempool.rs.html#217-219' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Seek to an offset, in bytes, in a stream. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#tymethod.seek">Read more</a></p>
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