133 lines
5.6 KiB
HTML
133 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 `log_enabled!` macro in crate `log`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, log_enabled!">
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<title>log::log_enabled! - Rust</title>
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<link rel="stylesheet" type="text/css" href="../rustdoc.css">
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<link rel="stylesheet" type="text/css" href="../main.css">
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<link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico">
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</head>
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<body class="rustdoc">
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<!--[if lte IE 8]>
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<div class="warning">
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This old browser is unsupported and will most likely display funky
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things.
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</div>
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<![endif]-->
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<nav class="sidebar">
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<a href='../log/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a>
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<p class='location'><a href='index.html'>log</a></p><script>window.sidebarCurrent = {name: 'log_enabled!', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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</nav>
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<nav class="sub">
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<form class="search-form js-only">
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<div class="search-container">
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<input class="search-input" name="search"
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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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</div>
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</form>
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</nav>
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<section id='main' class="content macro">
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<h1 class='fqn'><span class='in-band'><a href='index.html'>log</a>::<wbr><a class='macro' href=''>log_enabled!</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 id='src-323' class='srclink' href='../src/log/macros.rs.html#148-155' 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'>log_enabled</span> {
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(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>) <span class='op'>=></span> { ... };
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(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>) <span class='op'>=></span> { ... };
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}</pre>
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<div class='docblock'><p>Determines if a message logged at the specified level in that module will
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be logged.</p>
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<p>This can be used to avoid expensive computation of log message arguments if
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the message would be ignored anyway.</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='kw'>use</span> <span class='ident'>log</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>;
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<span class='kw'>if</span> <span class='macro'>log_enabled</span><span class='macro'>!</span>(<span class='ident'>Debug</span>) {
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<span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='ident'>expensive_call</span>();
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<span class='macro'>debug</span><span class='macro'>!</span>(<span class='string'>"expensive debug data: {} {}"</span>, <span class='ident'>data</span>.<span class='ident'>x</span>, <span class='ident'>data</span>.<span class='ident'>y</span>);
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}</pre>
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</div></section>
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<section id='search' class="content hidden"></section>
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<section class="footer"></section>
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<aside id="help" class="hidden">
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<div>
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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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<dt>?</dt>
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<dd>Show this help dialog</dd>
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<dt>S</dt>
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<dd>Focus the search field</dd>
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<dt>⇤</dt>
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<dd>Move up in search results</dd>
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<dt>⇥</dt>
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<dd>Move down in search results</dd>
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<dt>⏎</dt>
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<dd>Go to active search result</dd>
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<dt>+</dt>
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<dd>Collapse/expand all sections</dd>
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</dl>
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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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</p>
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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 = "log";
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window.playgroundUrl = "";
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</script>
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<script src="../jquery.js"></script>
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<script src="../main.js"></script>
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<script defer src="../search-index.js"></script>
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</body>
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</html>
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