145 lines
6 KiB
HTML
145 lines
6 KiB
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<meta name="description" content="API documentation for the Rust `debug_assert_matches` macro in crate `matches`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, debug_assert_matches">
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<title>matches::debug_assert_matches - Rust</title>
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<p class='location'><a href='index.html'>matches</a></p><script>window.sidebarCurrent = {name: 'debug_assert_matches', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>matches</a>::<wbr><a class="macro" href=''>debug_assert_matches</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/matches/lib.rs.html#100-102' title='goto source code'>[src]</a></span></h1>
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<pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">debug_assert_matches</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Assert that an expression matches a refutable pattern using debug assertions.</p>
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<p>Syntax: <code>debug_assert_matches!(</code> <em>expression</em> <code>,</code> <em>pattern</em> <code>)</code></p>
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<p>If debug assertions are enabled, panic with a message that shows the
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expression if it does not match the pattern.</p>
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<p>When debug assertions are not enabled, this macro does nothing.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">matches</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
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<span class="macro">debug_assert_matches</span><span class="macro">!</span>(<span class="ident">data</span>.<span class="ident">get</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(_));
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}</pre>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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and <code>const</code>.
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