What

Very simply "n" argument extension to core::mem::swap.

Motivation

Wrote it for doing a linked-list question on leetcode

Usage

Add the following to your Cargo.toml

swap-n = "0.1"

Use either #[macro_use] extern crate swap_n; or for newer versions, directly call swap_n::swap_n or via use swap_n::swap_n;

Example

use swap_n::swap_n;

fn main() {
    let mut x = std::boxed::Box::new(1);
    let mut y = std::boxed::Box::new(2);
    let mut z = std::boxed::Box::new(3);
    let mut w = std::boxed::Box::new(4);

    println!("The old values of x, y, z, w: {} {} {} {}", *x, *y, *z, *w);

    swap_n!(&mut x, &mut y, &mut z, &mut w);

    println!("The new values of x, y, z, w: {} {} {} {}", *x, *y, *z, *w);
}

License

MIT license

lib.rs:

Macro to extend core::mem::swap to n elements

Example usage:

// #[macro_use] extern crate swap_n;
use swap_n::swap_n;
    
let mut x = 1;
let mut y = 2;
let mut z = 3;

swap_n!(&mut x, &mut y, &mut z);

Examples of failure:

use swap_n::swap_n;

let mut x = 1;
swap_n!(&mut x);

use swap_n::swap_n;

let mut x = 1;
swap_n!(x);

use swap_n::swap_n;

let mut x = 1;
let mut y = 1.0;
swap_n!(&mut x, &mut y);