log​::macros

Macros

debug!error!info!log!log_enabled!warn!

log::macros::log_enabled![src]

macro_rules! log_enabled(
    ($lvl:expr) => ({
        let lvl = $lvl;
        (lvl != ::log::DEBUG || cfg!(not(ndebug))) &&
        lvl <= ::log::log_level() &&
        ::log::mod_enabled(lvl, module_path!())
    })
)

A macro to test whether a log level is enabled for the current module.

Example

#![feature(phase)] #[phase(plugin, link)] extern crate log; fn main() { struct Point { x: int, y: int } fn some_expensive_computation() -> Point { Point { x: 1, y: 2 } } if log_enabled!(log::DEBUG) { let x = some_expensive_computation(); debug!("x.x = {}, x.y = {}", x.x, x.y); } }
#![feature(phase)]
#[phase(plugin, link)] extern crate log;

if log_enabled!(log::DEBUG) {
    let x = some_expensive_computation();
    debug!("x.x = {}, x.y = {}", x.x, x.y);
}