Implement by-Reference operators

src/J3ML/LinearAlgebra/Vector2.cpp

@@ -15,13 +15,21 @@ namespace J3ML::LinearAlgebra {
     Vector2::Vector2(const Vector2& rhs): x(rhs.x), y(rhs.y)
     {}
 
-    float Vector2::operator[](std::size_t index)
+    float Vector2::operator[](std::size_t index) const
     {
         assert(index < 2);
         if (index == 0) return x;
         if (index == 1) return y;
         return 0;
     }
+
+    float &Vector2::operator[](std::size_t index)
+    {
+        assert(index < 2);
+        if (index == 0) return x;
+        if (index == 1) return y;
+    }
+
     bool Vector2::IsWithinMarginOfError(const Vector2& rhs, float margin) const
     {
         return this->Distance(rhs) <= margin;