Method zip_each_mut

perro_source/core/perro_structs/src/structs/matrix/mod.rs:465–482

(
        &mut self,
        rhs: &Matrix<ROWS, COLS, U>,
        mut f: impl FnMut(usize, usize, &mut T, &U),
    )

    #[inline]
    pub fn zip_each_mut<U>(
        &mut self,
        rhs: &Matrix<ROWS, COLS, U>,
        mut f: impl FnMut(usize, usize, &mut T, &U),
    ) -> &mut Self {
        for row in 0..ROWS {
            for col in 0..COLS {
                // SAFETY: row/col come from matrix bounds for both same-shape matrices.
                f(
                    row,
                    col,
                    unsafe { self.get_unchecked_mut(row, col) },
                    unsafe { rhs.get_unchecked(row, col) },
                );
            }
        }
        self
    }

    #[inline]
    pub fn for_neighbors_4(