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    /// Divide `n` by `divisor`, and round up to the nearest integer
    /// if not evenly divisable.
    #[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
        }
    }

    #[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)
            );
        }
    }

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