Replace by-value with by-reference parameters

include/ls-math/vector/Vector2.hpp

@@ -24,9 +24,9 @@ namespace ls::math::vector
 
       // arithmetic operations
 
-      ls::math::vector::Vector2 operator+(ls::math::vector::Vector2 _vector);
-      ls::math::vector::Vector2 operator-(ls::math::vector::Vector2 _vector);
-      ls::math::core::type::vector_scalar operator*(ls::math::vector::Vector2 _vector);
+      ls::math::vector::Vector2 operator+(const ls::math::vector::Vector2& _vector);
+      ls::math::vector::Vector2 operator-(const ls::math::vector::Vector2& _vector);
+      ls::math::core::type::vector_scalar operator*(const ls::math::vector::Vector2& _vector);
       ls::math::vector::Vector2 operator*(double _value);
       ls::math::vector::Vector2 operator/(double _divisor);
 

source/ls-math/vector/Vector2.cpp

@@ -16,19 +16,19 @@ ls::math::vector::Vector2::Vector2(const ls::math::core::type::vector2_component
   this->components[1] = _y;
 }
 
-ls::math::vector::Vector2 ls::math::vector::Vector2::operator+(ls::math::vector::Vector2 _vector)
+ls::math::vector::Vector2 ls::math::vector::Vector2::operator+(const ls::math::vector::Vector2& _vector)
 {
-  return ls::math::vector::Vector2{this->components[0] + _vector.getX(), this->components[1] + _vector.getY()};
+  return ls::math::vector::Vector2{this->components[0] + _vector.components[0], this->components[1] + _vector.components[1]};
 }
 
-ls::math::vector::Vector2 ls::math::vector::Vector2::operator-(ls::math::vector::Vector2 _vector)
+ls::math::vector::Vector2 ls::math::vector::Vector2::operator-(const ls::math::vector::Vector2& _vector)
 {
-  return ls::math::vector::Vector2{this->components[0] - _vector.getX(), this->components[1] - _vector.getY()};
+  return ls::math::vector::Vector2{this->components[0] - _vector.components[0], this->components[1] - _vector.components[1]};
 }
 
-ls::math::core::type::vector_scalar ls::math::vector::Vector2::operator*(ls::math::vector::Vector2 _vector)
+ls::math::core::type::vector_scalar ls::math::vector::Vector2::operator*(const ls::math::vector::Vector2& _vector)
 {
-  return this->components[0] * _vector.getX() + this->components[1] * _vector.getY();
+  return this->components[0] * _vector.components[0] + this->components[1] * _vector.components[1];
 }
 
 ls::math::vector::Vector2 ls::math::vector::Vector2::operator*(double _value)