136 lines
5.6 KiB
HTML
136 lines
5.6 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `ensure` macro in crate `failure`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, ensure">
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<title>failure::ensure - Rust</title>
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<link rel="stylesheet" type="text/css" href="../normalize.css">
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</head>
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<body class="rustdoc macro">
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This old browser is unsupported and will most likely display funky
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things.
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<![endif]-->
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<div class="sidebar-menu">☰</div>
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<p class='location'><a href='index.html'>failure</a></p><script>window.sidebarCurrent = {name: 'ensure', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</form>
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</nav>
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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'>failure</a>::<wbr><a class="macro" href=''>ensure</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/failure/macros.rs.html#25-36' 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">ensure</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">cond</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">cond</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Exits a function early with an <code>Error</code> if the condition is not satisfied.</p>
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<p>Similar to <code>assert!</code>, <code>ensure!</code> takes a condition and exits the function
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if the condition fails. Unlike <code>assert!</code>, <code>ensure!</code> returns an <code>Error</code>,
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it does not panic.</p>
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</div></section>
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dd>Show this help dialog</dd>
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</div>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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</div>
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</div>
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</aside>
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<script>
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window.rootPath = "../";
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window.currentCrate = "failure";
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