what operators should be methods , friends, and non-member function?

Asked Oct 29 '21 at 13:19

Active Oct 29 '21 at 13:19

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I have searched for a specific answer for my question and i couldn't find one , so here is my question:

I know that if we have operator+ and operator+= += should be a method and + a non-member function but what if we didn't have operator+= , should operator+ be friend then ?
I also know that symmetrical operators should be 'non-members' and 'friends' if needed , and I can see how == != are symmetrical operators, but what about < , > , >= , <= are they symmetric? and why ? I mean A<B is not the same as B<A , so are they symmetric? should they be declared as non-members? friends?

asked Oct 29 '21 at 13:19

Raea6789

Since C++20, there is [`<=>`](https://en.cppreference.com/w/cpp/language/default_comparisons) to replace most of them. – Jarod42 Oct 29 '21 at 13:22
@Jarod42 we use C++11 in the course I learn in university – Raea6789 Oct 29 '21 at 13:23

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