unchecked-indexing

Unchecked indexing through the regular index syntax.

Using a wrapper type that requires an unsafe block to create.

Example

use unchecked_index::unchecked_index;

/// unsafe because: trusts the permutation to be correct
unsafe fn apply_permutation<T>(perm: &mut [usize], v: &mut [T]) {
    debug_assert_eq!(perm.len(), v.len());
    
    // use unchecked (in reality, debug-checked) indexing throughout
    let mut perm = unchecked_index(perm);
    
    for i in 0..perm.len() {
        let mut current = i;
        while i != perm[current] {
            let next = perm[current];
            // move element from next to current
            v.swap(next, current);
            perm[current] = current;
            current = next;
        }
        perm[current] = current;
    }
}

How to contribute:

• Fix a bug or implement a new thing
• Include tests for your new feature
• Make a pull request

Recent Changes

• 0.1.1

  • Add Copy impl (for shared slices)

• 0.1.0

  • Initial release