cppreference.com > C++ Multimaps > Container operators Container operators Syntax:
      #include <map>
      container operator=(const container& c2);
      bool operator==(const container& c1, const container& c2);
      bool operator!=(const container& c1, const container& c2);
      bool operator<(const container& c1, const container& c2);
      bool operator>(const container& c1, const container& c2);
      bool operator<=(const container& c1, const container& c2);
      bool operator>=(const container& c1, const container& c2);
All of the C++ containers can be compared and assigned with the standard comparison operators: ==, !=, <=, >=, <, >, and =. Performing a comparison or assigning one multimap to another takes linear time. Two multimaps are equal if: Their size is the same, and Each member in location i in one multimap is equal to the the member in location i in the other multimap. Comparisons among multimaps are done lexicographically. Related topics: (C++ Strings) String operators (C++ Strings) at (C++ Lists) merge (C++ Lists) unique