Macro cli_log::time [−][src]
print the time that executing some expression took but only when relevant according to log level.
The goal of this macro is to avoid doing useless
Instant::now
.
Arguments:
- log level, optional (default is
Debug
) - a category, optional (only if name is set)
- a name, optional (stringified expression is used by default)
- the expression whose duration we want to log depending on the level
Examples:
#[macro_use] extern crate log; #[macro_use] extern crate cli_log; let result = time!(do_stuff(4)); let result = time!(Debug, do_stuff(3))?; let result = time!("World creation", do_stuff(7)); let sum = time!(Debug, "summing", 2 + 2); let sum = time!(Debug, "summing", 2 + 2); let mult = time!("operations", "mult 4", 3 * 4); let mult = time!(Info, "operations", "mult 4", 3 * 4);