operator< overload for std::map's int type comparison? (I want it to sort in descending order..)

Question

I have encountered a problem that I want to define a map, that is sorted internally by the first's descending order. if the first is not a primary type, like if it's a class, I can just overload the "<" within that class, but I don't know how to deal with the int type. Any suggestion?

Thanks a lot!!

Answer 1

Add a comparator:

#include <functional>
map<int, value_type, greater<int>> m;

The default is less<int>.