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use core::cmp;
/// The ticks of a timer.
pub trait TimerQueueTicks: Copy + PartialEq + Eq {
/// Represents a single tick.
const ONE_TICK: Self;
/// Compares to another tick count.
///
/// Takes into account timer wrapping; if the difference is more than
/// half the value range, the result will be flipped.
fn compare(self, other: Self) -> cmp::Ordering;
/// True if `self` is at the same time as `other` or later.
///
/// Takes into account timer wrapping; if the difference is more than
/// half the value range, the result will be negated.
fn is_at_least(self, other: Self) -> bool {
match self.compare(other) {
cmp::Ordering::Less => false,
cmp::Ordering::Equal => true,
cmp::Ordering::Greater => true,
}
}
/// Wrapping addition.
fn wrapping_add(self, other: Self) -> Self;
}
impl TimerQueueTicks for u32 {
const ONE_TICK: Self = 1;
fn compare(self, other: Self) -> cmp::Ordering {
(self.wrapping_sub(other) as i32).cmp(&0)
}
fn wrapping_add(self, other: Self) -> Self {
u32::wrapping_add(self, other)
}
}
impl TimerQueueTicks for u64 {
const ONE_TICK: Self = 1;
fn compare(self, other: Self) -> cmp::Ordering {
(self.wrapping_sub(other) as i64).cmp(&0)
}
fn wrapping_add(self, other: Self) -> Self {
u64::wrapping_add(self, other)
}
}
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