array_iter_tools/
mut_ref.rs

1//! ArrayIterator implementations on &mut [T; N]
2
3use crate::{ArrayIterator, IntoArrayIterator};
4use core::marker::PhantomData;
5
6/// ArrayIter is an implementation of [`ArrayIterator`] for &[T; N]
7pub struct ArrayIter<'a, T: 'a, const N: usize> {
8    ptr: *mut T,
9    i: usize,
10    _marker: PhantomData<&'a mut T>,
11}
12
13impl<'a, T, const N: usize> IntoArrayIterator<N> for &'a mut [T; N] {
14    type Item = &'a mut T;
15    type ArrayIter = ArrayIter<'a, T, N>;
16    fn into_array_iter(self) -> Self::ArrayIter {
17        ArrayIter {
18            ptr: self.as_mut_ptr(),
19            i: 0,
20            _marker: PhantomData,
21        }
22    }
23}
24
25impl<'a, T, const N: usize> ArrayIterator<N> for ArrayIter<'a, T, N> {
26    type Item = &'a mut T;
27    unsafe fn next(&mut self) -> Self::Item {
28        debug_assert_ne!(self.i, N, "Called next too many times");
29        let n = self.i + 1;
30        &mut *self.ptr.add(core::mem::replace(&mut self.i, n))
31    }
32}
array_iter_tools/mut_ref.rs

array_iter_tools/
mut_ref.rs
