swap in core::mem - Rust
Description: Swaps the values at two mutable locations, without deinitializing either one.

# Function swap

1.6.0 (const: 1.85.0) · Source

    pub const fn swap<T>(x: &mut T, y: &mut T)

Expand description

Swaps the values at two mutable locations, without deinitializing either one.

- If you want to swap with a default or dummy value, see `take`.
- If you want to swap with a passed value, returning the old value, see `replace`.

## §Examples

    use std::mem;

    let mut x = 5;
    let mut y = 42;

    mem::swap(&mut x, &mut y);

    assert_eq!(42, x);
    assert_eq!(5, y);