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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 `smallvec` macro in crate `smallvec`."><meta name="keywords" content="rust, rustlang, rust-lang, smallvec"><title>smallvec::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="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc macro"><!--[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><a href='../smallvec/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>smallvec</a></p><script>window.sidebarCurrent = {name: 'smallvec', ty: 'macro', 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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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='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/smallvec/lib.rs.html#113-129' title='goto source code'>[src]</a></span><span class='in-band'>Macro <a href='index.html'>smallvec</a>::<wbr><a class="macro" href=''>smallvec</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">smallvec</span> {
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(@<span class="ident">one</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>:<span class="ident">expr</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>$(,)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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}</pre></div>
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</div><div class='docblock'><p>Creates a [<code>SmallVec</code>] containing the arguments.</p>
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<p><code>smallvec!</code> allows <code>SmallVec</code>s to be defined with the same syntax as array expressions.
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There are two forms of this macro:</p>
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<ul>
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<li>Create a [<code>SmallVec</code>] containing a given list of elements:</li>
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</ul>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">SmallVec</span><span class="op"><</span>[<span class="kw">_</span>; <span class="number">128</span>]<span class="op">></span> <span class="op">=</span> <span class="macro">smallvec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>[<span class="number">0</span>], <span class="number">1</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>[<span class="number">1</span>], <span class="number">2</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>[<span class="number">2</span>], <span class="number">3</span>);</pre></div>
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<ul>
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<li>Create a [<code>SmallVec</code>] from a given element and size:</li>
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</ul>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">SmallVec</span><span class="op"><</span>[<span class="kw">_</span>; <span class="number">0x8000</span>]<span class="op">></span> <span class="op">=</span> <span class="macro">smallvec</span><span class="macro">!</span>[<span class="number">1</span>; <span class="number">3</span>];
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">SmallVec</span>::<span class="ident">from_buf</span>([<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>]));</pre></div>
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<p>Note that unlike array expressions this syntax supports all elements
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which implement [<code>Clone</code>] and the number of elements doesn't have to be
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a constant.</p>
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<p>This will use <code>clone</code> to duplicate an expression, so one should be careful
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using this with types having a nonstandard <code>Clone</code> implementation. For
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example, <code>smallvec![Rc::new(1); 5]</code> will create a vector of five references
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to the same boxed integer value, not five references pointing to independently
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boxed integers.</p>
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