Define subtraction via addition and division via multiplication

Author: skitov

src/r4/vector.hpp

@@ -435,23 +435,7 @@ template <class T, size_t S> class vector : public std::array<T, S>{
 	 * @return Reference to this vector object.
 	 */
 	template <size_t SS> vector& operator-=(const vector<T, SS>& vec)noexcept{
-		if constexpr (SS >= S){
-			for(size_t i = 0; i != S; ++i){
-				this->operator[](i) -= vec[i];
-			}
-		}else if constexpr (S < 4 || SS >= 4){
-			static_assert(SS < S, "");
-			for(size_t i = 0; i != SS; ++i){
-				this->operator[](i) -= vec[i];
-			}
-		}else{
-			static_assert(SS < 4, "");
-			static_assert(S >= 4, "");
-			for(size_t i = 0; i != SS; ++i){
-				this->operator[](i) -= vec[i];
-			}
-			this->operator[](3) -= T(1);
-		}
+		(*this) += -vec;
 		return *this;
 	}
 
@@ -472,9 +456,7 @@ template <class T, size_t S> class vector : public std::array<T, S>{
 	 * @return Reference to this vector object.
 	 */
 	vector& operator-=(T number)noexcept{
-		for(size_t i = 0; i != S; ++i){
-			this->operator[](i) -= number;
-		}
+		(*this) += -number;
 		return *this;
 	}
 
@@ -547,9 +529,7 @@ template <class T, size_t S> class vector : public std::array<T, S>{
 	 */
 	vector& operator/=(T num)noexcept{
 		ASSERT_INFO(num != 0, "vector::operator/=(): division by 0")
-		for(auto& c : *this){
-			c /= num;
-		}
+		(*this) *= T(1)/num;
 		return *this;
 	}