use std::ops::{Bound, Range, RangeBounds};

/// Divide `n` by `divisor`, and round up to the nearest integer

/// if not evenly divisible.

#[inline]

pub(super) fn div_round_up(n: usize, divisor: usize) -> usize {

    debug_assert!(divisor != 0, "Division by zero!");

    if n == 0 {

        0

    } else {

        (n - 1) / divisor + 1

    }

}

Unexecuted instantiation: rayon::math::div_round_up

Unexecuted instantiation: rayon::math::div_round_up

/// Normalize arbitrary `RangeBounds` to a `Range`

pub(super) fn simplify_range(range: impl RangeBounds<usize>, len: usize) -> Range<usize> {

    let start = match range.start_bound() {

        Bound::Unbounded => 0,

        Bound::Included(&i) if i <= len => i,

        Bound::Excluded(&i) if i < len => i + 1,

        bound => panic!("range start {:?} should be <= length {}", bound, len),

    };

    let end = match range.end_bound() {

        Bound::Unbounded => len,

        Bound::Excluded(&i) if i <= len => i,

        Bound::Included(&i) if i < len => i + 1,

        bound => panic!("range end {:?} should be <= length {}", bound, len),

    };

    if start > end {

        panic!(

            "range start {:?} should be <= range end {:?}",

            range.start_bound(),

            range.end_bound()

        );

    }

    start..end

}

Unexecuted instantiation: rayon::math::simplify_range::<core::ops::range::RangeFull>

Unexecuted instantiation: rayon::math::simplify_range::<_>

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    fn check_div_round_up() {

        assert_eq!(0, div_round_up(0, 5));

        assert_eq!(1, div_round_up(5, 5));

        assert_eq!(1, div_round_up(1, 5));

        assert_eq!(2, div_round_up(3, 2));

        assert_eq!(

            usize::max_value() / 2 + 1,

            div_round_up(usize::max_value(), 2)

        );

    }

}