Crate rawpointer

Rawpointer adds extra utility methods to raw pointers *const T, *mut T and NonNull<T>.

Features include:

• Strided offsets - .stride_offset(stride, index) make it easy to compute pointer offsets where the index is unsigned and the stride is signed.

• Offsetting methods in general for NonNull, since it does not have these from libcore

• Post- and preincrement and post- and predecrement methods

  • For p++ use p.post_inc().
  • For ++p use p.pre_inc().
  • For p-- use p.post_dec().
  • For --p use p.pre_dec().

use rawpointer::PointerExt;

unsafe {
    // In this example:
    // Use .post_inc() to iterate and overwrite the first four
    // elements of the array.

    let mut xs = [0; 16];
    let mut ptr = xs.as_mut_ptr();
    let end = ptr.offset(4);
    let mut i = 0;
    while ptr != end {
        *ptr.post_inc() = i;
        i += 1;
    }
    assert_eq!(&xs[..8], &[0, 1, 2, 3, 0, 0, 0, 0]);
}

Safety

See the Rust core::ptr documentation for more information.

Rust Version

This version of the crate requires Rust 1.26 or later

Traits

PointerExt

Extension methods for raw pointers

Functions

ptrdistance

Return the number of elements of T from start to end.
Return the arithmetic difference if T is zero size.