How to find an object with specific field values in a std::set?

Question

I call a method which returns std::set const& where T is a class type. What I\'m trying to achieve is to check whether the set contain

Answer 1

The std::set allows you to provide your own comparison function, as in

template < class Key, class Compare = less,
       class Allocator = allocator > class set; 

Only compare the values you care about and it will act as if objects with those values are =. Note that you will probably need a multiset for this.

This would be the way to do it if you really care about logn performance.