<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/regisp/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/log-0.4.26/src/macros.rs`."><title>macros.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-46132b98.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="log" data-themes="" data-resource-suffix="" data-rustdoc-version="1.85.0 (4d91de4e4 2025-02-17)" data-channel="1.85.0" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../../static.files/src-script-56102188.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">log/</div>macros.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers">
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// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
</span><span class="doccomment">/// The standard logging macro.
///
/// This macro will generically log with the specified `Level` and `format!`
/// based argument list.
///
/// # Examples
///
/// ```
/// use log::{log, Level};
///
/// # fn main() {
/// let data = (42, "Forty-two");
/// let private_data = "private";
///
/// log!(Level::Error, "Received errors: {}, {}", data.0, data.1);
/// log!(target: "app_events", Level::Warn, "App warning: {}, {}, {}",
/// data.0, data.1, private_data);
/// # }
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> log {
<span class="comment">// log!(target: "my_target", Level::Info, key1:? = 42, key2 = true; "a {} event", "log");
</span>(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$key</span>:tt $(:<span class="macro-nonterminal">$capture</span>:tt)<span class="question-mark">? </span>$(= <span class="macro-nonterminal">$value</span>:expr)<span class="question-mark">?</span>),+; $(<span class="macro-nonterminal">$arg</span>:tt)+) => ({
<span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>;
<span class="kw">if </span>lvl <= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL </span>&& lvl <= <span class="macro-nonterminal">$crate::max_level</span>() {
<span class="macro-nonterminal">$crate::__private_api::log</span>::<<span class="kw-2">&</span><span class="kw">_</span>>(
<span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::format_args!</span>($(<span class="macro-nonterminal">$arg</span>)+),
lvl,
<span class="kw-2">&</span>(<span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::module_path!</span>(), <span class="macro-nonterminal">$crate::__private_api::loc</span>()),
<span class="kw-2">&</span>[$((<span class="macro-nonterminal">$</span><span class="macro">crate::__log_key!</span>(<span class="macro-nonterminal">$key</span>), <span class="macro-nonterminal">$</span><span class="macro">crate::__log_value!</span>(<span class="macro-nonterminal">$key </span>$(:<span class="macro-nonterminal">$capture</span>)* = $(<span class="macro-nonterminal">$value</span>)<span class="kw-2">*</span>))),+]
);
}
});
<span class="comment">// log!(target: "my_target", Level::Info, "a {} event", "log");
</span>(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => ({
<span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>;
<span class="kw">if </span>lvl <= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL </span>&& lvl <= <span class="macro-nonterminal">$crate::max_level</span>() {
<span class="macro-nonterminal">$crate::__private_api::log</span>(
<span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::format_args!</span>($(<span class="macro-nonterminal">$arg</span>)+),
lvl,
<span class="kw-2">&</span>(<span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::module_path!</span>(), <span class="macro-nonterminal">$crate::__private_api::loc</span>()),
(),
);
}
});
<span class="comment">// log!(Level::Info, "a log event")
</span>(<span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::module_path!</span>(), <span class="macro-nonterminal">$lvl</span>, $(<span class="macro-nonterminal">$arg</span>)+));
}
<span class="doccomment">/// Logs a message at the error level.
///
/// # Examples
///
/// ```
/// use log::error;
///
/// # fn main() {
/// let (err_info, port) = ("No connection", 22);
///
/// error!("Error: {err_info} on port {port}");
/// error!(target: "app_events", "App Error: {err_info}, Port: {port}");
/// # }
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> error {
<span class="comment">// error!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// error!(target: "my_target", "a {} event", "log")
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Error</span>, $(<span class="macro-nonterminal">$arg</span>)+));
<span class="comment">// error!("a {} event", "log")
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">$crate::Level::Error</span>, $(<span class="macro-nonterminal">$arg</span>)+))
}
<span class="doccomment">/// Logs a message at the warn level.
///
/// # Examples
///
/// ```
/// use log::warn;
///
/// # fn main() {
/// let warn_description = "Invalid Input";
///
/// warn!("Warning! {warn_description}!");
/// warn!(target: "input_events", "App received warning: {warn_description}");
/// # }
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> warn {
<span class="comment">// warn!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// warn!(target: "my_target", "a {} event", "log")
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Warn</span>, $(<span class="macro-nonterminal">$arg</span>)+));
<span class="comment">// warn!("a {} event", "log")
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">$crate::Level::Warn</span>, $(<span class="macro-nonterminal">$arg</span>)+))
}
<span class="doccomment">/// Logs a message at the info level.
///
/// # Examples
///
/// ```
/// use log::info;
///
/// # fn main() {
/// # struct Connection { port: u32, speed: f32 }
/// let conn_info = Connection { port: 40, speed: 3.20 };
///
/// info!("Connected to port {} at {} Mb/s", conn_info.port, conn_info.speed);
/// info!(target: "connection_events", "Successful connection, port: {}, speed: {}",
/// conn_info.port, conn_info.speed);
/// # }
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> info {
<span class="comment">// info!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// info!(target: "my_target", "a {} event", "log")
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Info</span>, $(<span class="macro-nonterminal">$arg</span>)+));
<span class="comment">// info!("a {} event", "log")
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">$crate::Level::Info</span>, $(<span class="macro-nonterminal">$arg</span>)+))
}
<span class="doccomment">/// Logs a message at the debug level.
///
/// # Examples
///
/// ```
/// use log::debug;
///
/// # fn main() {
/// # struct Position { x: f32, y: f32 }
/// let pos = Position { x: 3.234, y: -1.223 };
///
/// debug!("New position: x: {}, y: {}", pos.x, pos.y);
/// debug!(target: "app_events", "New position: x: {}, y: {}", pos.x, pos.y);
/// # }
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> debug {
<span class="comment">// debug!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// debug!(target: "my_target", "a {} event", "log")
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Debug</span>, $(<span class="macro-nonterminal">$arg</span>)+));
<span class="comment">// debug!("a {} event", "log")
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">$crate::Level::Debug</span>, $(<span class="macro-nonterminal">$arg</span>)+))
}
<span class="doccomment">/// Logs a message at the trace level.
///
/// # Examples
///
/// ```
/// use log::trace;
///
/// # fn main() {
/// # struct Position { x: f32, y: f32 }
/// let pos = Position { x: 3.234, y: -1.223 };
///
/// trace!("Position is: x: {}, y: {}", pos.x, pos.y);
/// trace!(target: "app_events", "x is {} and y is {}",
/// if pos.x >= 0.0 { "positive" } else { "negative" },
/// if pos.y >= 0.0 { "positive" } else { "negative" });
/// # }
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> trace {
<span class="comment">// trace!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// trace!(target: "my_target", "a {} event", "log")
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Trace</span>, $(<span class="macro-nonterminal">$arg</span>)+));
<span class="comment">// trace!("a {} event", "log")
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro-nonterminal">$</span><span class="macro">crate::log!</span>(<span class="macro-nonterminal">$crate::Level::Trace</span>, $(<span class="macro-nonterminal">$arg</span>)+))
}
<span class="doccomment">/// Determines if a message logged at the specified level in that module will
/// be logged.
///
/// This can be used to avoid expensive computation of log message arguments if
/// the message would be ignored anyway.
///
/// # Examples
///
/// ```
/// use log::Level::Debug;
/// use log::{debug, log_enabled};
///
/// # fn foo() {
/// if log_enabled!(Debug) {
/// let data = expensive_call();
/// debug!("expensive debug data: {} {}", data.x, data.y);
/// }
/// if log_enabled!(target: "Global", Debug) {
/// let data = expensive_call();
/// debug!(target: "Global", "expensive debug data: {} {}", data.x, data.y);
/// }
/// # }
/// # struct Data { x: u32, y: u32 }
/// # fn expensive_call() -> Data { Data { x: 0, y: 0 } }
/// # fn main() {}
/// ```
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> log_enabled {
(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr) => {{
<span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>;
lvl <= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL
</span>&& lvl <= <span class="macro-nonterminal">$crate::max_level</span>()
&& <span class="macro-nonterminal">$crate::__private_api::enabled</span>(lvl, <span class="macro-nonterminal">$target</span>)
}};
(<span class="macro-nonterminal">$lvl</span>:expr) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::log_enabled!</span>(<span class="macro-nonterminal">target</span>: <span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::module_path!</span>(), <span class="macro-nonterminal">$lvl</span>)
};
}
<span class="comment">// These macros use a pattern of #[cfg]s to produce nicer error
// messages when log features aren't available
</span><span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(feature = <span class="string">"kv"</span>)]
</span><span class="macro">macro_rules!</span> __log_key {
<span class="comment">// key1 = 42
</span>($(<span class="macro-nonterminal">$args</span>:ident)<span class="kw-2">*</span>) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__private_api::stringify!</span>($(<span class="macro-nonterminal">$args</span>)<span class="kw-2">*</span>)
};
<span class="comment">// "key1" = 42
</span>($(<span class="macro-nonterminal">$args</span>:expr)<span class="kw-2">*</span>) => {
$(<span class="macro-nonterminal">$args</span>)*
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(not(feature = <span class="string">"kv"</span>))]
</span><span class="macro">macro_rules!</span> __log_key {
($(<span class="macro-nonterminal">$args</span>:tt)<span class="kw-2">*</span>) => {
<span class="macro">compile_error!</span>(<span class="string">"key value support requires the `kv` feature of `log`"</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(feature = <span class="string">"kv"</span>)]
</span><span class="macro">macro_rules!</span> __log_value {
<span class="comment">// Entrypoint
</span>(<span class="macro-nonterminal">$key</span>:tt = <span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value!</span>((<span class="macro-nonterminal">$args</span>):value)
};
(<span class="macro-nonterminal">$key</span>:tt :<span class="macro-nonterminal">$capture</span>:tt = <span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value!</span>((<span class="macro-nonterminal">$args</span>):<span class="macro-nonterminal">$capture</span>)
};
(<span class="macro-nonterminal">$key</span>:ident =) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value!</span>((<span class="macro-nonterminal">$key</span>):value)
};
(<span class="macro-nonterminal">$key</span>:ident :<span class="macro-nonterminal">$capture</span>:tt =) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value!</span>((<span class="macro-nonterminal">$key</span>):<span class="macro-nonterminal">$capture</span>)
};
<span class="comment">// ToValue
</span>((<span class="macro-nonterminal">$args</span>:expr):value) => {
<span class="macro-nonterminal">$crate::__private_api::capture_to_value</span>(&&<span class="macro-nonterminal">$args</span>)
};
<span class="comment">// Debug
</span>((<span class="macro-nonterminal">$args</span>:expr):<span class="question-mark">?</span>) => {
<span class="macro-nonterminal">$crate::__private_api::capture_debug</span>(&&<span class="macro-nonterminal">$args</span>)
};
((<span class="macro-nonterminal">$args</span>:expr):debug) => {
<span class="macro-nonterminal">$crate::__private_api::capture_debug</span>(&&<span class="macro-nonterminal">$args</span>)
};
<span class="comment">// Display
</span>((<span class="macro-nonterminal">$args</span>:expr):%) => {
<span class="macro-nonterminal">$crate::__private_api::capture_display</span>(&&<span class="macro-nonterminal">$args</span>)
};
((<span class="macro-nonterminal">$args</span>:expr):display) => {
<span class="macro-nonterminal">$crate::__private_api::capture_display</span>(&&<span class="macro-nonterminal">$args</span>)
};
<span class="comment">//Error
</span>((<span class="macro-nonterminal">$args</span>:expr):err) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value_error!</span>(<span class="macro-nonterminal">$args</span>)
};
<span class="comment">// sval::Value
</span>((<span class="macro-nonterminal">$args</span>:expr):sval) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value_sval!</span>(<span class="macro-nonterminal">$args</span>)
};
<span class="comment">// serde::Serialize
</span>((<span class="macro-nonterminal">$args</span>:expr):serde) => {
<span class="macro-nonterminal">$</span><span class="macro">crate::__log_value_serde!</span>(<span class="macro-nonterminal">$args</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(not(feature = <span class="string">"kv"</span>))]
</span><span class="macro">macro_rules!</span> __log_value {
($(<span class="macro-nonterminal">$args</span>:tt)<span class="kw-2">*</span>) => {
<span class="macro">compile_error!</span>(<span class="string">"key value support requires the `kv` feature of `log`"</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(feature = <span class="string">"kv_sval"</span>)]
</span><span class="macro">macro_rules!</span> __log_value_sval {
(<span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro-nonterminal">$crate::__private_api::capture_sval</span>(&&<span class="macro-nonterminal">$args</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(not(feature = <span class="string">"kv_sval"</span>))]
</span><span class="macro">macro_rules!</span> __log_value_sval {
(<span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro">compile_error!</span>(<span class="string">"capturing values as `sval::Value` requites the `kv_sval` feature of `log`"</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(feature = <span class="string">"kv_serde"</span>)]
</span><span class="macro">macro_rules!</span> __log_value_serde {
(<span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro-nonterminal">$crate::__private_api::capture_serde</span>(&&<span class="macro-nonterminal">$args</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(not(feature = <span class="string">"kv_serde"</span>))]
</span><span class="macro">macro_rules!</span> __log_value_serde {
(<span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro">compile_error!</span>(
<span class="string">"capturing values as `serde::Serialize` requites the `kv_serde` feature of `log`"
</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(feature = <span class="string">"kv_std"</span>)]
</span><span class="macro">macro_rules!</span> __log_value_error {
(<span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro-nonterminal">$crate::__private_api::capture_error</span>(<span class="kw-2">&</span><span class="macro-nonterminal">$args</span>)
};
}
<span class="attr">#[doc(hidden)]
#[macro_export]
#[cfg(not(feature = <span class="string">"kv_std"</span>))]
</span><span class="macro">macro_rules!</span> __log_value_error {
(<span class="macro-nonterminal">$args</span>:expr) => {
<span class="macro">compile_error!</span>(
<span class="string">"capturing values as `std::error::Error` requites the `kv_std` feature of `log`"
</span>)
};
}
</code></pre></div></section></main></body></html>