58 wiersze
1.6 KiB
Rust
58 wiersze
1.6 KiB
Rust
use std::ops::{Add, Mul, Sub};
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macro_rules! assert_equal_len {
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// The `tt` (token tree) designator is used for
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// operators and tokens.
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($a:ident, $b: ident, $func:ident) => (
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assert_eq!($a.len(), $b.len(),
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"{:?}: dimension mismatch: {:?} {:?}",
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stringify!($func),
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($a.len(),),
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($b.len(),));
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)
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}
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macro_rules! op {
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($func:ident, $bound:ident, $method:ident) => (
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pub fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
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assert_equal_len!(xs, ys, $func);
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for (x, y) in xs.iter_mut().zip(ys.iter()) {
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*x = $bound::$method(*x, *y);
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}
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}
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)
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}
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// Implement `add_assign`, `mul_assign`, and `sub_assign` functions.
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op!(add_assign, Add, add);
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op!(mul_assign, Mul, mul);
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op!(sub_assign, Sub, sub);
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#[cfg(test)]
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mod test {
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use std::iter;
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macro_rules! test {
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($func: ident, $x:expr, $y:expr, $z:expr) => {
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#[test]
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fn $func() {
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for size in 0usize..10 {
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let mut x: Vec<_> = iter::repeat($x).take(size).collect();
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let y: Vec<_> = iter::repeat($y).take(size).collect();
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let z: Vec<_> = iter::repeat($z).take(size).collect();
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super::$func(&mut x, &y);
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assert_eq!(x, z);
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}
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}
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}
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}
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// Test `add_assign`, `mul_assign` and `sub_assign`
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test!(add_assign, 1u32, 2u32, 3u32);
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test!(mul_assign, 2u32, 3u32, 6u32);
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test!(sub_assign, 3u32, 2u32, 1u32);
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}
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