Example

class MyClass { public: MyClass(int input); MyClass(const MyClass& right); int getter() const{ return num; } void settter(int input) { field = num; } private: int num; }; const MyClass operator+(const MyClass& left, const MyClass& right){ return MyClass(left.getter() + right.getter()); }

Solution

If you declare a binary operator, you might also want an operator= function. class MyClass { public: MyClass(int input); MyClass(const MyClass& right); int getter() const{ return num; } void settter(int input) { field = num; } MyClass& operator+=(const MyClass& right); private: int num; }; const MyClass operator+(const MyClass& left, const MyClass& right){ return MyClass(left) += right; }