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