64 lines
1.4 KiB
Rust
64 lines
1.4 KiB
Rust
use std::fmt::{Display, Error, Formatter};
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/// A timer.
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#[derive(Copy, Clone, Debug, Default)]
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pub struct Timer {
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time: f64,
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#[allow(dead_code)] // The field isn’t used if the `profiler` feature isn’t enabled.
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start: Option<f64>,
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}
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impl Timer {
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/// Creates a new timer initialized to zero and not started.
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pub fn new() -> Self {
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Timer {
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time: 0.0,
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start: None,
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}
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}
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/// Resets the timer to 0.
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pub fn reset(&mut self) {
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self.time = 0.0
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}
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/// Start the timer.
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pub fn start(&mut self) {
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#[cfg(feature = "profiler")]
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{
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self.time = 0.0;
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self.start = Some(instant::now());
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}
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}
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/// Pause the timer.
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pub fn pause(&mut self) {
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#[cfg(feature = "profiler")]
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{
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if let Some(start) = self.start {
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self.time += instant::now() - start;
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}
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self.start = None;
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}
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}
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/// Resume the timer.
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pub fn resume(&mut self) {
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#[cfg(feature = "profiler")]
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{
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self.start = Some(instant::now());
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}
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}
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/// The measured time between the last `.start()` and `.pause()` calls.
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pub fn time(&self) -> f64 {
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self.time
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}
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}
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impl Display for Timer {
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fn fmt(&self, f: &mut Formatter) -> Result<(), Error> {
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write!(f, "{}s", self.time)
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}
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}
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