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//! This module fits the requirement of `rtic-monotonic`, but has uses beyond that.
use core::{
self,
cmp::{Ord, Ordering, PartialOrd},
ops::{Add, Sub},
time::Duration,
};
/// A time instant, from the start of a timer, with nanosecond precision. Has methods similar
/// to that found in `core::Duration`.
#[derive(Eq, PartialEq, PartialOrd, Copy, Clone, Default)]
pub struct Instant {
/// Total count, in microseconds. We use a signed integer for use with Durations.
count_ns: i128,
// todo: Count ticks instead?
}
/// An instant. Designed to be, in its most basic sense, similar to `std::time::Instant`. Created
/// from the `now()` method on a `Timer`. Can be compared to create a `core::Duration`. Standalone
/// methods on this struct are similar to those on `Duration`, but return timestamps since the timer start.
impl Instant {
pub(crate) fn new(count_ns: i128) -> Self {
Self { count_ns }
}
/// The time, in seconds.
pub fn as_secs(&self) -> f32 {
self.count_ns as f32 / 1_000_000_000.
}
/// The time, in milliseconds.
pub fn as_millis(&self) -> u32 {
(self.count_ns / 1_000_000) as u32
}
/// The time, in milliseconds as an f32.
pub fn as_millis_f32(&self) -> f32 {
self.count_ns as f32 / 1_000_000.
}
/// The time, in microseconds
pub fn as_micros(&self) -> u64 {
(self.count_ns / 1_000) as u64
}
/// The time, in nanoseconds
pub fn as_nanos(&self) -> u128 {
self.count_ns as u128
}
}
impl Ord for Instant {
fn cmp(&self, other: &Self) -> Ordering {
// self.count_us.cmp(&other.count_us)
self.count_ns.cmp(&other.count_ns)
}
}
impl Add<Duration> for Instant {
type Output = Self;
fn add(self, rhs: Duration) -> Self::Output {
Self {
count_ns: self.count_ns + rhs.as_nanos() as i128,
}
}
}
impl Sub<Duration> for Instant {
type Output = Self;
fn sub(self, rhs: Duration) -> Self::Output {
Self {
count_ns: self.count_ns - rhs.as_nanos() as i128,
}
}
}
impl Sub<Self> for Instant {
type Output = Duration;
fn sub(self, rhs: Self) -> Self::Output {
// todo: Handle negative overflow.
Duration::from_nanos((self.count_ns - rhs.count_ns) as u64)
}
}