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use std::sync::atomic::AtomicUsize;
pub struct Limit {
upper_bound: usize,
#[allow(unused)]
max: AtomicUsize,
}
impl Limit {
#[inline]
pub const fn new(upper_bound: usize) -> Self {
Self { upper_bound, max: AtomicUsize::new(0) }
}
#[inline]
#[cfg(feature = "tracking")]
pub const fn new_tracking(upper_bound: usize) -> Self {
Self { upper_bound, max: AtomicUsize::new(1) }
}
#[inline]
pub const fn inner(&self) -> usize {
self.upper_bound
}
#[inline]
pub fn check(&self, other: usize) -> Result<(), ()> {
if other > self.upper_bound {
Err(())
} else {
#[cfg(feature = "tracking")]
loop {
use std::sync::atomic::Ordering;
let old_max = self.max.load(Ordering::Relaxed);
if other <= old_max || old_max == 0 {
break;
}
if self
.max
.compare_exchange(old_max, other, Ordering::Relaxed, Ordering::Relaxed)
.is_ok()
{
eprintln!("new max: {}", other);
}
}
Ok(())
}
}
}