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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="Small vectors in various sizes. These store a certain number of elements inline, and fall back to the heap for larger allocations.  This can be a useful optimization for improving cache locality and reducing allocator traffic for workloads that fit within the inline buffer."><meta name="keywords" content="rust, rustlang, rust-lang, smallvec"><title>smallvec - 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="../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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                <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">Crate <a class="mod" href="">smallvec</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">&#x2212;</span>]</a></span><a class="srclink" href="../src/smallvec/lib.rs.html#7-1981" title="goto source code">[src]</a></span></h1><div class="docblock"><p>Small vectors in various sizes. These store a certain number of elements inline, and fall back
to the heap for larger allocations.  This can be a useful optimization for improving cache
locality and reducing allocator traffic for workloads that fit within the inline buffer.</p>
<h2 id="no_std-support" class="section-header"><a href="#no_std-support"><code>no_std</code> support</a></h2>
<p>By default, <code>smallvec</code> does not depend on <code>std</code>.  However, the optional
<code>write</code> feature implements the <code>std::io::Write</code> trait for vectors of <code>u8</code>.
When this feature is enabled, <code>smallvec</code> depends on <code>std</code>.</p>
<h2 id="optional-features" class="section-header"><a href="#optional-features">Optional features</a></h2><h3 id="serde" class="section-header"><a href="#serde"><code>serde</code></a></h3>
<p>When this optional dependency is enabled, <code>SmallVec</code> implements the <code>serde::Serialize</code> and
<code>serde::Deserialize</code> traits.</p>
<h3 id="write" class="section-header"><a href="#write"><code>write</code></a></h3>
<p>When this feature is enabled, <code>SmallVec&lt;[u8; _]&gt;</code> implements the <code>std::io::Write</code> trait.
This feature is not compatible with <code>#![no_std]</code> programs.</p>
<h3 id="union" class="section-header"><a href="#union"><code>union</code></a></h3>
<p><strong>This feature requires Rust 1.49.</strong></p>
<p>When the <code>union</code> feature is enabled <code>smallvec</code> will track its state (inline or spilled)
without the use of an enum tag, reducing the size of the <code>smallvec</code> by one machine word.
This means that there is potentially no space overhead compared to <code>Vec</code>.
Note that <code>smallvec</code> can still be larger than <code>Vec</code> if the inline buffer is larger than two
machine words.</p>
<p>To use this feature add <code>features = [&quot;union&quot;]</code> in the <code>smallvec</code> section of Cargo.toml.
Note that this feature requires Rust 1.49.</p>
<p>Tracking issue: <a href="https://github.com/rust-lang/rust/issues/55149">rust-lang/rust#55149</a></p>
<h3 id="const_generics" class="section-header"><a href="#const_generics"><code>const_generics</code></a></h3>
<p><strong>This feature is unstable and requires a nightly build of the Rust toolchain.</strong></p>
<p>When this feature is enabled, <code>SmallVec</code> works with any arrays of any size, not just a fixed
list of sizes.</p>
<p>Tracking issue: <a href="https://github.com/rust-lang/rust/issues/44580">rust-lang/rust#44580</a></p>
<h3 id="specialization" class="section-header"><a href="#specialization"><code>specialization</code></a></h3>
<p><strong>This feature is unstable and requires a nightly build of the Rust toolchain.</strong></p>
<p>When this feature is enabled, <code>SmallVec::from(slice)</code> has improved performance for slices
of <code>Copy</code> types.  (Without this feature, you can use <code>SmallVec::from_slice</code> to get optimal
performance for <code>Copy</code> types.)</p>
<p>Tracking issue: <a href="https://github.com/rust-lang/rust/issues/31844">rust-lang/rust#31844</a></p>
<h3 id="may_dangle" class="section-header"><a href="#may_dangle"><code>may_dangle</code></a></h3>
<p><strong>This feature is unstable and requires a nightly build of the Rust toolchain.</strong></p>
<p>This feature makes the Rust compiler less strict about use of vectors that contain borrowed
references. For details, see the
<a href="https://doc.rust-lang.org/1.42.0/nomicon/dropck.html#an-escape-hatch">Rustonomicon</a>.</p>
<p>Tracking issue: <a href="https://github.com/rust-lang/rust/issues/34761">rust-lang/rust#34761</a></p>
</div><h2 id="macros" class="section-header"><a href="#macros">Macros</a></h2>
<table><tr class="module-item"><td><a class="macro" href="macro.smallvec.html" title="smallvec::smallvec macro">smallvec</a></td><td class="docblock-short"><p>Creates a <a href="../smallvec/struct.SmallVec.html" title="SmallVec"><code>SmallVec</code></a> containing the arguments.</p>
</td></tr></table><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2>
<table><tr class="module-item"><td><a class="struct" href="struct.Drain.html" title="smallvec::Drain struct">Drain</a></td><td class="docblock-short"><p>An iterator that removes the items from a <code>SmallVec</code> and yields them by value.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.IntoIter.html" title="smallvec::IntoIter struct">IntoIter</a></td><td class="docblock-short"><p>An iterator that consumes a <code>SmallVec</code> and yields its items by value.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.SmallVec.html" title="smallvec::SmallVec struct">SmallVec</a></td><td class="docblock-short"><p>A <code>Vec</code>-like container that can store a small number of elements inline.</p>
</td></tr></table><h2 id="enums" class="section-header"><a href="#enums">Enums</a></h2>
<table><tr class="module-item"><td><a class="enum" href="enum.CollectionAllocErr.html" title="smallvec::CollectionAllocErr enum">CollectionAllocErr</a></td><td class="docblock-short"><p>Error type for APIs with fallible heap allocation</p>
</td></tr></table><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2>
<table><tr class="module-item"><td><a class="trait" href="trait.Array.html" title="smallvec::Array trait">Array</a></td><td class="docblock-short"><p>Types that can be used as the backing store for a SmallVec</p>
</td></tr><tr class="module-item"><td><a class="trait" href="trait.ToSmallVec.html" title="smallvec::ToSmallVec trait">ToSmallVec</a></td><td class="docblock-short"><p>Convenience trait for constructing a <code>SmallVec</code></p>
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