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use std::ops::Sub;
use crate::Matrix;
use super::matrix_init;
pub trait MSub<Rhs: Matrix>: Matrix
where
Self::Output: Matrix
{
type Output;
/// Subtracts one matrix from another of equal dimensions
///
/// A - B
///
/// # Arguments
///
/// * `rhs` - The subtracted matrix
///
/// # Examples
///
/// ```rust
/// let a = [
/// [1.0, 2.0],
/// [3.0, 4.0]
/// ];
/// let b = [
/// [4.0, 3.0],
/// [2.0, 1.0]
/// ];
/// let s = [
/// [a[0][0] - b[0][0], a[0][1] - b[0][1]],
/// [a[1][0] - b[1][0], a[1][1] - b[1][1]]
/// ];
/// assert_eq!(a.sub(b), s);
/// ```
fn sub(self, rhs: Rhs) -> Self::Output;
}
impl<T1, T2, const H: usize, const L: usize> MSub<[[T2; L]; H]> for [[T1; L]; H]
where
Self: Matrix,
[[T2; L]; H]: Matrix,
[[<T1 as Sub<T2>>::Output; L]; H]: Matrix,
T1: Sub<T2> + Clone,
T2: Clone
{
type Output = [[<T1 as Sub<T2>>::Output; L]; H];
fn sub(self, rhs: [[T2; L]; H]) -> Self::Output
{
matrix_init(|r, c| self[r][c].clone() - rhs[r][c].clone())
}
}