| /// 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) |
| ); |
| } |
| } |