Crate retain_mut

This crate provides trait RetainMut which provides retain_mut method for Vec and VecDeque.

retain_mut is basically the same as retain except that it gives mutable reference of items to the predicate function.

Since there is no reason retain couldn’t have been designed this way, this crate basically just copies the code from std with minor (1-line) change to hand out mutable reference. The code these impls are based on can be found in code comments of this crate.

Examples

Vec

let mut vec = vec![1, 2, 3, 4];
vec.retain_mut(|x| { *x *= 3; *x % 2 == 0 });
assert_eq!(vec, [6, 12]);

VecDeque

let mut deque = VecDeque::from(vec![1, 2, 3, 4]);
deque.retain_mut(|x| { *x *= 3; *x % 2 == 0 });
assert_eq!(deque, [6, 12]);

Traits

RetainMut

Trait that provides retain_mut method.