bindgen/
time.rs

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1use std::io::{self, Write};
2use std::time::{Duration, Instant};
3
4/// RAII timer to measure how long phases take.
5#[derive(Debug)]
6pub struct Timer<'a> {
7    output: bool,
8    name: &'a str,
9    start: Instant,
10}
11
12impl<'a> Timer<'a> {
13    /// Creates a Timer with the given name, and starts it. By default,
14    /// will print to stderr when it is `drop`'d
15    pub fn new(name: &'a str) -> Self {
16        Timer {
17            output: true,
18            name,
19            start: Instant::now(),
20        }
21    }
22
23    /// Sets whether or not the Timer will print a message
24    /// when it is dropped.
25    pub fn with_output(mut self, output: bool) -> Self {
26        self.output = output;
27        self
28    }
29
30    /// Returns the time elapsed since the timer's creation
31    pub fn elapsed(&self) -> Duration {
32        Instant::now() - self.start
33    }
34
35    fn print_elapsed(&mut self) {
36        if self.output {
37            let elapsed = self.elapsed();
38            let time = (elapsed.as_secs() as f64) * 1e3 +
39                f64::from(elapsed.subsec_nanos()) / 1e6;
40            let stderr = io::stderr();
41            // Arbitrary output format, subject to change.
42            writeln!(stderr.lock(), "  time: {time:>9.3} ms.\t{}", self.name)
43                .expect("timer write should not fail");
44        }
45    }
46}
47
48impl Drop for Timer<'_> {
49    fn drop(&mut self) {
50        self.print_elapsed();
51    }
52}
bindgen/time.rs

bindgen/
time.rs
