CODEWITHSUNDEEP
c++boostoperator-overloading
jfritz42
jfritz42

Reputation: 5993

If you overload operator== do you also need to overload operator!=?

I am using the BOOST_STRONG_TYPEDEF macro, which creates a class that overloads operator==. I'm wondering if I need to overload operator!= as well?

Upvotes: 4

Views: 124

Answers (2)

Antoine Auffray
Antoine Auffray

Reputation: 1293

Well, no. These operators are totally independent, you can overload one but not the another if you don't use it

Upvotes: 2

jfritz42
jfritz42

Reputation: 5993

Answer: no!

The reason (that I didn't notice at first) is that BOOST_STRONG_TYPEDEF uses Boost operators (http://www.boost.org/doc/libs/1_38_0/libs/utility/operators.htm), specifically totally_ordered1 and totally_ordered2. So the less than and equality comparison operators are implemented for you.

Upvotes: 5

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