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</pre><pre class='rust '>
<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='doccomment'>/// The standard logging macro.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This macro will generically log with the specified `LogLevel` and `format!`</span>
<span class='doccomment'>/// based argument list.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `max_level_*` features can be used to statically disable logging at</span>
<span class='doccomment'>/// various levels.</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>log</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>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>+</span>) <span class='op'>=></span> ({
<span class='kw'>static</span> <span class='ident'>_LOC</span>: <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLocation</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLocation</span> {
<span class='ident'>__line</span>: <span class='macro'>line</span><span class='macro'>!</span>(),
<span class='ident'>__file</span>: <span class='macro'>file</span><span class='macro'>!</span>(),
<span class='ident'>__module_path</span>: <span class='macro'>module_path</span><span class='macro'>!</span>(),
};
<span class='kw'>let</span> <span class='ident'>lvl</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>;
<span class='kw'>if</span> <span class='ident'>lvl</span> <span class='op'><=</span> <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>__static_max_level</span>() <span class='op'>&&</span> <span class='ident'>lvl</span> <span class='op'><=</span> <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>max_log_level</span>() {
<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>__log</span>(<span class='ident'>lvl</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='kw-2'>&</span><span class='ident'>_LOC</span>, <span class='macro'>format_args</span><span class='macro'>!</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>+</span>))
}
});
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</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> (<span class='macro'>log</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>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>+</span>))
}
<span class='doccomment'>/// Logs a message at the error level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Logging at this level is disabled if the `max_level_off` feature is present.</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>error</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'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Error</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
);
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Error</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
)
}
<span class='doccomment'>/// Logs a message at the warn level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Logging at this level is disabled if any of the following features are</span>
<span class='doccomment'>/// present: `max_level_off` or `max_level_error`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When building in release mode (i.e., without the `debug_assertions` option),</span>
<span class='doccomment'>/// logging at this level is also disabled if any of the following features are</span>
<span class='doccomment'>/// present: `release_max_level_off` or `max_level_error`.</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>warn</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'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Warn</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
);
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Warn</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
)
}
<span class='doccomment'>/// Logs a message at the info level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Logging at this level is disabled if any of the following features are</span>
<span class='doccomment'>/// present: `max_level_off`, `max_level_error`, or `max_level_warn`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When building in release mode (i.e., without the `debug_assertions` option),</span>
<span class='doccomment'>/// logging at this level is also disabled if any of the following features are</span>
<span class='doccomment'>/// present: `release_max_level_off`, `release_max_level_error`, or</span>
<span class='doccomment'>/// `release_max_level_warn`.</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>info</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'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Info</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
);
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Info</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
)
}
<span class='doccomment'>/// Logs a message at the debug level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Logging at this level is disabled if any of the following features are</span>
<span class='doccomment'>/// present: `max_level_off`, `max_level_error`, `max_level_warn`, or</span>
<span class='doccomment'>/// `max_level_info`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When building in release mode (i.e., without the `debug_assertions` option),</span>
<span class='doccomment'>/// logging at this level is also disabled if any of the following features are</span>
<span class='doccomment'>/// present: `release_max_level_off`, `release_max_level_error`,</span>
<span class='doccomment'>/// `release_max_level_warn`, or `release_max_level_info`.</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>debug</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'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Debug</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
);
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Debug</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
)
}
<span class='doccomment'>/// Logs a message at the trace level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Logging at this level is disabled if any of the following features are</span>
<span class='doccomment'>/// present: `max_level_off`, `max_level_error`, `max_level_warn`,</span>
<span class='doccomment'>/// `max_level_info`, or `max_level_debug`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When building in release mode (i.e., without the `debug_assertions` option),</span>
<span class='doccomment'>/// logging at this level is also disabled if any of the following features are</span>
<span class='doccomment'>/// present: `release_max_level_off`, `release_max_level_error`,</span>
<span class='doccomment'>/// `release_max_level_warn`, `release_max_level_info`, or</span>
<span class='doccomment'>/// `release_max_level_debug`.</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>trace</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'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Trace</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
);
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=></span> (
<span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>LogLevel</span>::<span class='ident'>Trace</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='kw-2'>*</span>);
)
}
<span class='doccomment'>/// Determines if a message logged at the specified level in that module will</span>
<span class='doccomment'>/// be logged.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This can be used to avoid expensive computation of log message arguments if</span>
<span class='doccomment'>/// the message would be ignored anyway.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Examples</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # #[macro_use]</span>
<span class='doccomment'>/// # extern crate log;</span>
<span class='doccomment'>/// use log::LogLevel::Debug;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # fn foo() {</span>
<span class='doccomment'>/// if log_enabled!(Debug) {</span>
<span class='doccomment'>/// let data = expensive_call();</span>
<span class='doccomment'>/// debug!("expensive debug data: {} {}", data.x, data.y);</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// # struct Data { x: u32, y: u32 }</span>
<span class='doccomment'>/// # fn expensive_call() -> Data { Data { x: 0, y: 0 } }</span>
<span class='doccomment'>/// # fn main() {}</span>
<span class='doccomment'>/// ```</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<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'>=></span> ({
<span class='kw'>let</span> <span class='ident'>lvl</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>;
<span class='ident'>lvl</span> <span class='op'><=</span> <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>__static_max_level</span>() <span class='op'>&&</span> <span class='ident'>lvl</span> <span class='op'><=</span> <span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>max_log_level</span>() <span class='op'>&&</span>
<span class='macro-nonterminal'>$</span><span class='kw'>crate</span>::<span class='macro-nonterminal'>__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'>=></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>
</section>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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Search functions by type signature (e.g.
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