Crate swap3

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§swap3

Provides utility functions for simultaneously swapping three values by rotating them either left (abc → bca) or right (abc → cab). These functions can come in handy e.g. when rotating elements of a binary tree in list representation.

The provided functions work on arbitrary types and do not require the type to be Clone, Copy or Default.

§Crate features

  • unsafe - The unsafe feature enables the use of (potentially faster) unsafe code. It is disabled by default; when disabled, forbid(unsafe_code) is implied.

§Examples

For individual references, the swap3_bca (rotate left) and swap3_cab (rotate right) functions are available:

let mut a = 10;
let mut b = 20;
let mut c = 30;

swap3::swap3_bca(&mut a, &mut b, &mut c);
assert_eq!([a, b, c], [20, 30, 10]);

For slices, the swap3_bca_slice and swap3_cab_slice functions can be used:

let mut vec = vec![10, 20, 30, 40, 50, 60];
swap3::swap3_bca_slice(&mut vec, 0, 1, 4);
assert_eq!(vec, &[20, 50, 30, 40, 10, 60]);

… or using the Swap3 trait imported from the prelude:

use swap3::prelude::*;

let mut vec = vec![10, 20, 30, 40, 50, 60];
vec.swap3_bca(0, 1, 4);
assert_eq!(vec, &[20, 50, 30, 40, 10, 60]);

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