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use crate::clock;
use std::convert::TryInto;
use std::fmt;
use std::ops::{Add, Div, Mul};
use std::prelude::v1::*;
use std::time::Duration;
#[derive(PartialEq, Eq, Default, Clone, Copy, PartialOrd, Ord)]
pub struct Nanos(u64);
impl Nanos {
pub fn as_u64(self) -> u64 {
self.0
}
}
#[cfg(feature = "std")]
impl Nanos {
pub const fn new(u: u64) -> Self {
Nanos(u)
}
}
impl From<Duration> for Nanos {
fn from(d: Duration) -> Self {
Nanos(
d.as_nanos()
.try_into()
.expect("Duration is longer than 584 years"),
)
}
}
impl fmt::Debug for Nanos {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
let d = Duration::from_nanos(self.0);
write!(f, "Nanos({:?})", d)
}
}
impl Add<Nanos> for Nanos {
type Output = Nanos;
fn add(self, rhs: Nanos) -> Self::Output {
Nanos(self.0 + rhs.0)
}
}
impl Mul<u64> for Nanos {
type Output = Nanos;
fn mul(self, rhs: u64) -> Self::Output {
Nanos(self.0 * rhs)
}
}
impl Div<Nanos> for Nanos {
type Output = u64;
fn div(self, rhs: Nanos) -> Self::Output {
self.0 / rhs.0
}
}
impl From<u64> for Nanos {
fn from(u: u64) -> Self {
Nanos(u)
}
}
impl From<Nanos> for u64 {
fn from(n: Nanos) -> Self {
n.0
}
}
impl From<Nanos> for Duration {
fn from(n: Nanos) -> Self {
Duration::from_nanos(n.0)
}
}
impl Nanos {
#[inline]
pub fn saturating_sub(self, rhs: Nanos) -> Nanos {
Nanos(self.0.saturating_sub(rhs.0))
}
}
impl clock::Reference for Nanos {
#[inline]
fn duration_since(&self, earlier: Self) -> Nanos {
(*self as Nanos).saturating_sub(earlier)
}
#[inline]
fn saturating_sub(&self, duration: Nanos) -> Self {
(*self as Nanos).saturating_sub(duration)
}
}
impl Add<Duration> for Nanos {
type Output = Self;
fn add(self, other: Duration) -> Self {
let other: Nanos = other.into();
self + other
}
}
#[cfg(all(feature = "std", test))]
mod test {
use super::*;
use std::time::Duration;
#[test]
fn nanos_impls() {
let n = Nanos::new(20);
assert_eq!("Nanos(20ns)", format!("{:?}", n));
}
#[test]
fn nanos_arith_coverage() {
let n = Nanos::new(20);
let n_half = Nanos::new(10);
assert_eq!(n / n_half, 2);
assert_eq!(30, (n + Duration::from_nanos(10)).as_u64());
assert_eq!(n_half.saturating_sub(n), Nanos::new(0));
assert_eq!(n.saturating_sub(n_half), n_half);
assert_eq!(clock::Reference::saturating_sub(&n_half, n), Nanos::new(0));
}
}