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author2015-06-29 20:16:15 +0000
committer2015-06-29 20:16:15 +0000
commit64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree8c64d6e8be006486d975a651505fbbde61365cd6 /log/macro.log_enabled!.html
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+ <section id='main' class="content macro">
+<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'>
+ <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
+ [<span class='inner'>&#x2212;</span>]
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+ </span><a id='src-1625' class='srclink' href='../src/log/macros.rs.html#133-145' title='goto source code'>[src]</a></span></h1>
+<pre class='rust macro'>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>log_enabled</span> {
+ (<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'>=&gt;</span> ({
+ <span class='kw'>let</span> <span class='ident'>lvl</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>;
+ <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;off&quot;</span>) <span class='op'>&amp;&amp;</span>
+ (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Error</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;error&quot;</span>)) <span class='op'>&amp;&amp;</span>
+ (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;warn&quot;</span>)) <span class='op'>&amp;&amp;</span>
+ (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;debug&quot;</span>)) <span class='op'>&amp;&amp;</span>
+ (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Info</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;info&quot;</span>)) <span class='op'>&amp;&amp;</span>
+ <span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>max_log_level</span>() <span class='op'>&amp;&amp;</span>
+ <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>__enabled</span>(<span class='ident'>lvl</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>)
+ });
+ (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> (<span class='macro'>log_enabled</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro'>module_path</span><span class='macro'>!</span>(), <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>))
+}
+</pre>
+<div class='docblock'><p>Determines if a message logged at the specified level in that module will
+be logged.</p>
+
+<p>This can be used to avoid expensive computation of log message arguments if
+the message would be ignored anyway.</p>
+
+<h1 id="examples" class='section-header'><a
+ href="#examples">Examples</a></h1><pre class='rust rust-example-rendered'>
+<span class='kw'>use</span> <span class='ident'>log</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>;
+
+<span class='kw'>if</span> <span class='macro'>log_enabled</span><span class='macro'>!</span>(<span class='ident'>Debug</span>) {
+ <span class='macro'>debug</span><span class='macro'>!</span>(<span class='string'>&quot;expensive debug data: {}&quot;</span>, <span class='ident'>expensive_call</span>());
+}
+</pre>
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