rayon/
math.rs

1use std::ops::{Bound, Range, RangeBounds};
2
3/// Normalize arbitrary `RangeBounds` to a `Range`
4pub(super) fn simplify_range(range: impl RangeBounds<usize>, len: usize) -> Range<usize> {
5    let start = match range.start_bound() {
6        Bound::Unbounded => 0,
7        Bound::Included(&i) if i <= len => i,
8        Bound::Excluded(&i) if i < len => i + 1,
9        bound => panic!("range start {bound:?} should be <= length {len}"),
10    };
11    let end = match range.end_bound() {
12        Bound::Unbounded => len,
13        Bound::Excluded(&i) if i <= len => i,
14        Bound::Included(&i) if i < len => i + 1,
15        bound => panic!("range end {bound:?} should be <= length {len}"),
16    };
17    if start > end {
18        panic!(
19            "range start {:?} should be <= range end {:?}",
20            range.start_bound(),
21            range.end_bound()
22        );
23    }
24    start..end
25}
rayon/math.rs

rayon/
math.rs
