-use time_crate as time;
+//! This module contains a few utilities to measure how long executing algorithms takes.
+use std::time::*;
+
+/// This function will measure how long it takes to execute the given lambda,
+/// print the time and return the result of the lambda.
pub fn report_time<Out, F: FnOnce() -> Out>(name: &str, f: F) -> Out {
- let start = time::now();
- println!("starting {}", name);
+ let start = Instant::now();
+ eprintln!("starting {}", name);
let res = f();
- println!("done {} - took: {}", name, (time::now() - start));
+ eprintln!("done {} - took: {}s", name, start.elapsed().as_secs_f64());
res
}
-pub fn measure<Out, F: FnOnce() -> Out>(f: F) -> (Out, time::Duration) {
- let start = time::now();
+/// This function will measure how long it takes to execute the given lambda
+/// and return a tuple of the result of the lambda and a duration object.
+pub fn measure<Out, F: FnOnce() -> Out>(f: F) -> (Out, Duration) {
+ let start = Instant::now();
let res = f();
- (res, time::now() - start)
+ (res, start.elapsed())
}
+/// A struct to repeatedly measure the time passed since the timer was started
#[derive(Debug)]
pub struct Timer {
- start: time::Tm
+ start: Instant,
}
impl Default for Timer {
}
impl Timer {
+ /// Create and start a new `Timer`
pub fn new() -> Timer {
- Timer { start: time::now() }
+ Timer { start: Instant::now() }
}
+ /// Reset the `Timer`
pub fn restart(&mut self) {
- self.start = time::now();
+ self.start = Instant::now();
}
+ /// Print the passed time in ms since the timer was started
pub fn report_passed_ms(&self) {
- println!("{}ms", (time::now() - self.start).num_milliseconds());
+ eprintln!("{}ms", self.start.elapsed().as_secs_f64() * 1000.0);
+ }
+
+ /// Return the number of ms passed since the timer was started as a `i64`
+ pub fn get_passed_ms(&self) -> f64 {
+ self.start.elapsed().as_secs_f64() * 1000.0
}
- pub fn get_passed_ms(&self) -> i64 {
- (time::now() - self.start).num_milliseconds()
+ /// Return the number of ms passed since the timer was started as a `std::time::Duration`
+ pub fn get_passed(&self) -> Duration {
+ self.start.elapsed()
}
}