| // This is a part of Chrono. |
| // Portions Copyright 2013-2014 The Rust Project Developers. |
| // See README.md and LICENSE.txt for details. |
| |
| //! Integer division utilities. (Shamelessly copied from [num](https://github.com/rust-lang/num/)) |
| |
| // Algorithm from [Daan Leijen. _Division and Modulus for Computer Scientists_, |
| // December 2001](http://research.microsoft.com/pubs/151917/divmodnote-letter.pdf) |
| |
| pub use num_integer::{div_floor, div_mod_floor, div_rem, mod_floor}; |
| |
| #[cfg(test)] |
| mod tests { |
| use super::{div_mod_floor, mod_floor}; |
| |
| #[test] |
| fn test_mod_floor() { |
| assert_eq!(mod_floor(8, 3), 2); |
| assert_eq!(mod_floor(8, -3), -1); |
| assert_eq!(mod_floor(-8, 3), 1); |
| assert_eq!(mod_floor(-8, -3), -2); |
| |
| assert_eq!(mod_floor(1, 2), 1); |
| assert_eq!(mod_floor(1, -2), -1); |
| assert_eq!(mod_floor(-1, 2), 1); |
| assert_eq!(mod_floor(-1, -2), -1); |
| } |
| |
| #[test] |
| fn test_div_mod_floor() { |
| assert_eq!(div_mod_floor(8, 3), (2, 2)); |
| assert_eq!(div_mod_floor(8, -3), (-3, -1)); |
| assert_eq!(div_mod_floor(-8, 3), (-3, 1)); |
| assert_eq!(div_mod_floor(-8, -3), (2, -2)); |
| |
| assert_eq!(div_mod_floor(1, 2), (0, 1)); |
| assert_eq!(div_mod_floor(1, -2), (-1, -1)); |
| assert_eq!(div_mod_floor(-1, 2), (-1, 1)); |
| assert_eq!(div_mod_floor(-1, -2), (0, -1)); |
| } |
| } |
