Rust на примерах

assert_equal_len!(xs, ys, $func, $op);

for (x, y) in xs.iter_mut().zip(ys.iter()) {

*x = $bound::$method(*x, *y);

// *x = x.$method(*y);

}

}

)

}

// Реализуем функции `add_assign`, `mul_assign`, и `sub_assign`.

op!(add_assign, Add, +=, add);

op!(mul_assign, Mul, *=, mul);

op!(sub_assign, Sub, -=, sub);

mod test {

use std::iter;

macro_rules! test {

($func: ident, $x:expr, $y:expr, $z:expr) => {

#[test]

fn $func() {

for size in 0usize..10 {

let mut x: Vec<_> = iter::repeat($x).take(size).collect();

let y: Vec<_> = iter::repeat($y).take(size).collect();

let z: Vec<_> = iter::repeat($z).take(size).collect();

super::$func(&mut x, &y);

assert_eq!(x, z);

}

}

}

}

// Протестируем `add_assign`, `mul_assign` и `sub_assign`

test!(add_assign, 1u32, 2u32, 3u32);

test!(mul_assign, 2u32, 3u32, 6u32);

test!(sub_assign, 3u32, 2u32, 1u32);

}

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$ rustc --test dry.rs && ./dry

running 3 tests

test test::mul_assign ... ok

test test::add_assign ... ok