Example

class MyClass { public: inline MyClass operator*(const MyClass& left, const MyClass& right); MyClass* operator/(const MyClass& left, const MyClass& right); MyClass& operator+(const MyClass& left, const MyClass& right); private: int field; };

Solution

Binary operators should return const objects. class MyClass { public: inline const MyClass operator*(const MyClass& left, const MyClass& right); const MyClass operator/(const MyClass& left, const MyClass& right); const MyClass operator+(const MyClass& left, const MyClass& right); private: int field; };