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use array_trait::Array;
use slice_ops::AsSlice;
#[const_trait]
pub trait ArrayTransposeAssign<T, const N: usize>: Array + AsSlice<Item = [T; N]>
{
/// Transposes a square matrix in-place.
///
/// # Examples
/// ```rust
/// use array__ops::ops::*;
///
/// let mut a = [
/// [1, 2, 3],
/// [4, 5, 6],
/// [7, 8, 9]
/// ];
///
/// a.transpose_assign();
///
/// assert_eq!(a, [
/// [1, 4, 7],
/// [2, 5, 8],
/// [3, 6, 9]
/// ]);
/// ```
fn transpose_assign(&mut self);
}
impl<T, const N: usize> const ArrayTransposeAssign<T, N> for [[T; N]; N]
{
fn transpose_assign(&mut self)
{
let mut r = 0;
while r < N
{
let row = unsafe {
(&mut self[r] as *mut [T; N]).as_mut_unchecked()
};
let mut c = r + 1;
while c < N
{
core::mem::swap(
&mut row[c],
&mut self[c][r]
);
c += 1;
}
r += 1;
}
}
}