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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Function <a href='index.html'>env_logger</a>::<wbr><a class="fn" href=''>try_init_from_env</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/env_logger/lib.rs.html#1021-1028' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn try_init_from_env<'a, E>(env: E) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../log/struct.SetLoggerError.html" title="struct log::SetLoggerError">SetLoggerError</a>> <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></pre><div class='docblock'><p>Attempts to initialize the global logger with an env logger from the given
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environment variables.</p>
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<p>This should be called early in the execution of a Rust program. Any log
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events that occur before initialization will be ignored.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>Initialise a logger using the <code>MY_LOG</code> environment variable for filters
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and <code>MY_LOG_STYLE</code> for writing colors:</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">Builder</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</span>(<span class="string">"MY_LOG"</span>).<span class="ident">write_style</span>(<span class="string">"MY_LOG_STYLE"</span>);
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<span class="ident">env_logger</span>::<span class="ident">try_init_from_env</span>(<span class="ident">env</span>)<span class="question-mark">?</span>;
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<span class="prelude-val">Ok</span>(())</pre>
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<h1 id="errors" class="section-header"><a href="#errors">Errors</a></h1>
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<p>This function will fail if it is called more than once, or if another
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library has already initialized a global logger.</p>
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