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Delete mini integer-division module.

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We no longer need this since we've added rationals.
This commit is contained in:
David Wang 2017-03-16 08:03:29 +11:00
parent ab6267b46c
commit 3afb599568
2 changed files with 0 additions and 78 deletions
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77
src/intdiv.rs
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@ -1,77 +0,0 @@
//! Integer division.
use std::i32;
pub trait IntDiv {
fn div_round_up(self, b: Self) -> Self;
fn div_round_down(self, b: Self) -> Self;
}
impl IntDiv for i32 {
fn div_round_up(self, b: Self) -> Self {
if b == 0 { panic!("attempt to divide by zero"); }
if b == -1 && self == i32::MIN { panic!("attempt to divide with overflow"); }
let aa = (self as i64).abs();
let bb = (b as i64).abs();
if (self > 0) == (b > 0) {
((aa + bb - 1) / bb) as i32
} else {
-(aa / bb) as i32
}
}
fn div_round_down(self, b: Self) -> Self {
if b == 0 { panic!("attempt to divide by zero"); }
if b == -1 && self == i32::MIN { panic!("attempt to divide with overflow"); }
let aa = (self as i64).abs();
let bb = (b as i64).abs();
if (self > 0) == (b > 0) {
(aa / bb) as i32
} else {
-((aa + bb - 1) / bb) as i32
}
}
}
#[cfg(test)]
mod tests {
use std::i32;
use super::IntDiv;
#[test]
fn test_div_round_up() {
// 7.0 / 5.0 = 1.4
assert_eq!(( 0).div_round_up( 5), 0);
assert_eq!(( 0).div_round_up(-5), 0);
assert_eq!(( 7).div_round_up( 5), 2);
assert_eq!(( 7).div_round_up(-5), -1);
assert_eq!((-7).div_round_up( 5), -1);
assert_eq!((-7).div_round_up(-5), 2);
assert_eq!((i32::MIN).div_round_up(1), i32::MIN);
}
#[test]
fn test_div_round_down() {
// 7.0 / 5.0 = 1.4
assert_eq!(( 0).div_round_down( 5), 0);
assert_eq!(( 0).div_round_down(-5), 0);
assert_eq!(( 7).div_round_down( 5), 1);
assert_eq!(( 7).div_round_down(-5), -2);
assert_eq!((-7).div_round_down( 5), -2);
assert_eq!((-7).div_round_down(-5), 1);
}
#[test]
#[should_panic]
fn test_div_round_up_panic() {
(i32::MIN).div_round_up(-1);
}
#[test]
#[should_panic]
fn test_div_round_down_panic() {
(i32::MIN).div_round_down(-1);
}
}

1
src/lib.rs
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@ -49,7 +49,6 @@ pub struct Solution {
pub mod constraint; pub mod constraint;
mod intdiv;
mod linexpr; mod linexpr;
mod puzzle; mod puzzle;