1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/// print the time that executing $timed took
/// but only when the log level is "debug".
/// The goal of this macro is to avoid doing useless
/// `Instant::now` in non Debug executions.
///
/// Examples:
/// ```
/// let sum = time!(
/// Debug,
/// "summing",
/// 2 + 2 // this is super hard
/// );
/// let mult = time!(Info, 3 * 4);
/// ```
macro_rules! time {
($level: ident, $name: expr, $timed: expr $(,)?) => {{
use log::Level::*;
if log_enabled!($level) {
use std::time::Instant;
let start = Instant::now();
let value = $timed;
log!($level, "{} took {:?}", $name, start.elapsed());
value
} else {
$timed
}
}};
($level: ident, $cat: expr, $name :expr, $timed: expr $(,)?) => {{
use log::Level::*;
if log_enabled!($level) {
use std::time::Instant;
let start = Instant::now();
let value = $timed;
log!($level, "{} on {:?} took {:?}", $cat, $name, start.elapsed());
value
} else {
$timed
}
}};
}