Question

In my classes I often write a quick operator!= by returning !(*this == rhs), e.g.:

class Foo { private:     int n_;     std::string str_; public:     ...     bool operator==(const Foo& rhs) const     {         return n_ == rhs.n_ && str_ == rhs.str_;     }      bool operator!=(const Foo& rhs) const     {         return !(*this == rhs);     } }; 

I can’t see any obvious problems with doing this but thought I’d ask if anyone knows of any.

Answer 1

I believe that’s the preferred method of implementing operator!= so that you don’t repeat yourself, and you have a guaranteed correct relationship with operator==.