Allow for non-consuming std operations on DMat. Added DMat multiplication test.

src/structs/dmat.rs

@@ -265,7 +265,35 @@ impl<N> IndexMut<(usize, usize)> for DMat<N> {
 impl<N: Copy + Mul<N, Output = N> + Add<N, Output = N> + Zero> Mul<DMat<N>> for DMat<N> {
     type Output = DMat<N>;
 
+    #[inline]
     fn mul(self, right: DMat<N>) -> DMat<N> {
+        (&self) * (&right)
+    }
+}
+
+impl<'a, N: Copy + Mul<N, Output = N> + Add<N, Output = N> + Zero> Mul<&'a DMat<N>> for DMat<N> {
+    type Output = DMat<N>;
+
+    #[inline]
+    fn mul(self, right: &'a DMat<N>) -> DMat<N> {
+        (&self) * right
+    }
+}
+
+impl<'a, N: Copy + Mul<N, Output = N> + Add<N, Output = N> + Zero> Mul<DMat<N>> for &'a DMat<N> {
+    type Output = DMat<N>;
+
+    #[inline]
+    fn mul(self, right: DMat<N>) -> DMat<N> {
+        right * self
+    }
+}
+
+impl<'a, N: Copy + Mul<N, Output = N> + Add<N, Output = N> + Zero> Mul<&'a DMat<N>> for &'a DMat<N> {
+    type Output = DMat<N>;
+
+    #[inline]
+    fn mul(self, right: &DMat<N>) -> DMat<N> {
         assert!(self.ncols == right.nrows);
 
         let mut res = unsafe { DMat::new_uninitialized(self.nrows, right.ncols) };
@@ -668,6 +696,15 @@ impl<N: Copy + Add<N, Output = N>> Add<DMat<N>> for DMat<N> {
 
     #[inline]
     fn add(self, right: DMat<N>) -> DMat<N> {
+        self + (&right)
+    }
+}
+
+impl<'a, N: Copy + Add<N, Output = N>> Add<&'a DMat<N>> for DMat<N> {
+    type Output = DMat<N>;
+
+    #[inline]
+    fn add(self, right: &'a DMat<N>) -> DMat<N> {
         assert!(self.nrows == right.nrows && self.ncols == right.ncols,
                 "Unable to add matrices with different dimensions.");
 
@@ -701,6 +738,15 @@ impl<N: Copy + Sub<N, Output = N>> Sub<DMat<N>> for DMat<N> {
 
     #[inline]
     fn sub(self, right: DMat<N>) -> DMat<N> {
+        self - (&right)
+    }
+}
+
+impl<'a, N: Copy + Sub<N, Output = N>> Sub<&'a DMat<N>> for DMat<N> {
+    type Output = DMat<N>;
+
+    #[inline]
+    fn sub(self, right: &'a DMat<N>) -> DMat<N> {
         assert!(self.nrows == right.nrows && self.ncols == right.ncols,
                 "Unable to subtract matrices with different dimensions.");
 

tests/mat.rs

@@ -322,6 +322,38 @@ fn test_dmat_addition() {
     assert!((mat1 + mat2) == res);
 }
 
+#[test]
+fn test_dmat_multiplication() {
+   let mat1 = DMat::from_row_vec(
+        2,
+        2,
+        &[
+            1.0, 2.0,
+            3.0, 4.0
+        ]
+    );
+
+    let mat2 = DMat::from_row_vec(
+        2,
+        2,
+        &[
+            10.0, 20.0,
+            30.0, 40.0
+        ]
+    );
+
+    let res = DMat::from_row_vec(
+        2,
+        2,
+        &[
+            70.0, 100.0,
+            150.0, 220.0
+        ]
+    );
+
+    assert!((mat1 * mat2) == res);
+}
+
 #[test]
 fn test_dmat_subtraction() {
     let mat1 = DMat::from_row_vec(