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<p class='location'>Struct Logger</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.from_env">from_env</a><a href="#method.from_default_env">from_default_env</a><a href="#method.filter">filter</a><a href="#method.matches">matches</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Log">Log</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='index.html'>env_logger</a></p><script>window.sidebarCurrent = {name: 'Logger', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>env_logger</a>::<wbr><a class="struct" href=''>Logger</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/env_logger/lib.rs.html#261-265' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Logger { /* fields omitted */ }</pre></div><div class='docblock'><p>The env logger.</p>
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<p>This struct implements the <code>Log</code> trait from the <a href="https://docs.rs/log/"><code>log</code> crate</a>,
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which allows it to act as a logger.</p>
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<p>The <a href="fn.init.html"><code>init()</code></a>, <a href="fn.try_init.html"><code>try_init()</code></a>, <a href="struct.Builder.html#method.init"><code>Builder::init()</code></a> and <a href="struct.Builder.html#method.try_init"><code>Builder::try_init()</code></a>
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methods will each construct a <code>Logger</code> and immediately initialize it as the
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default global logger.</p>
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<p>If you'd instead need access to the constructed <code>Logger</code>, you can use
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the associated <a href="struct.Builder.html"><code>Builder</code></a> and install it with the
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<a href="https://docs.rs/log/"><code>log</code> crate</a> directly.</p>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../env_logger/struct.Logger.html" title="struct env_logger::Logger">Logger</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#707-772' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.from_env' class="method"><span id='from_env.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.from_env' class='fnname'>from_env</a><'a, E>(env: E) -> Self <span class="where fmt-newline">where<br> E: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../env_logger/struct.Env.html" title="struct env_logger::Env">Env</a><'a>>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#734-739' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates the logger from the environment.</p>
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<p>The variables used to read configuration from can be tweaked before
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passing in.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>Create a logger reading the log filter from an environment variable
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called <code>MY_LOG</code>:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">Logger</span>;
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<span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">Logger</span>::<span class="ident">from_env</span>(<span class="string">"MY_LOG"</span>);</pre>
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<p>Create a logger using the <code>MY_LOG</code> variable for filtering and
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<code>MY_LOG_STYLE</code> for whether or not to write styles:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">env_logger</span>::{<span class="ident">Logger</span>, <span class="ident">Env</span>};
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<span class="kw">let</span> <span class="ident">env</span> <span class="op">=</span> <span class="ident">Env</span>::<span class="ident">new</span>().<span class="ident">filter_or</span>(<span class="string">"MY_LOG"</span>, <span class="string">"info"</span>).<span class="ident">write_style_or</span>(<span class="string">"MY_LOG_STYLE"</span>, <span class="string">"always"</span>);
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<span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">Logger</span>::<span class="ident">from_env</span>(<span class="ident">env</span>);</pre>
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</div><h4 id='method.from_default_env' class="method"><span id='from_default_env.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.from_default_env' class='fnname'>from_default_env</a>() -> Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#758-760' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates the logger from the environment using default variable names.</p>
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<p>This method is a convenient way to call <code>from_env(Env::default())</code> without
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having to use the <code>Env</code> type explicitly. The logger will use the
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<a href="struct.Env.html#default-environment-variables">default environment variables</a>.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<p>Creates a logger using the default environment variables:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">Logger</span>;
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<span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">Logger</span>::<span class="ident">from_default_env</span>();</pre>
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</div><h4 id='method.filter' class="method"><span id='filter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.filter' class='fnname'>filter</a>(&self) -> <a class="enum" href="../log/enum.LevelFilter.html" title="enum log::LevelFilter">LevelFilter</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#764-766' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the maximum <code>LevelFilter</code> that this env logger instance is
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configured to output.</p>
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</div><h4 id='method.matches' class="method"><span id='matches.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.matches' class='fnname'>matches</a>(&self, record: &<a class="struct" href="../log/struct.Record.html" title="struct log::Record">Record</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#769-771' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Checks if this record matches the configured filter.</p>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../env_logger/struct.Logger.html" title="struct env_logger::Logger">Logger</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#948-954' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#949-953' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Log' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../log/trait.Log.html" title="trait log::Log">Log</a> for <a class="struct" href="../env_logger/struct.Logger.html" title="struct env_logger::Logger">Logger</a></code><a href='#impl-Log' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#774-832' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.enabled' class="method"><span id='enabled.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../log/trait.Log.html#tymethod.enabled' class='fnname'>enabled</a>(&self, metadata: &<a class="struct" href="../log/struct.Metadata.html" title="struct log::Metadata">Metadata</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#775-777' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Determines if a log message with the specified metadata would be logged. <a href="../log/trait.Log.html#tymethod.enabled">Read more</a></p>
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</div><h4 id='method.log' class="method"><span id='log.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../log/trait.Log.html#tymethod.log' class='fnname'>log</a>(&self, record: &<a class="struct" href="../log/struct.Record.html" title="struct log::Record">Record</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#779-829' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Logs the <code>Record</code>. <a href="../log/trait.Log.html#tymethod.log">Read more</a></p>
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</div><h4 id='method.flush' class="method"><span id='flush.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../log/trait.Log.html#tymethod.flush' class='fnname'>flush</a>(&self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/env_logger/lib.rs.html#831' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Flushes any buffered records.</p>
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