c++ - I need help while inserting in a map of integer and set of a structure -

the code :

#include <map> #include <utility>  typedef struct {    int d_number;    int o_number; } d_o_pair;  std::set<d_o_pair> d_o_set; std::map<int, d_o_set> my_map;  } 

i want insert map. not able to

. using : this->my_map[5].insert(make_pair(0, 2)). compiler throws me error telling no function matches call insert

following sample code tell inserting map. inserting set, need overload '<' operator define ordering condition in structure constructor , insert in similar fashion using insert function.

#include<iostream> #include<map>  using namespace std;  typedef struct {     int d_number;     int o_number; }d_o_number;  int main() {     d_o_number s1;     s1.d_number  = 100;     s1.o_number = 1000;      std::map<int, d_o_number> d_o_map;     d_o_map.insert(std::pair<int, d_o_number>(0, s1));      // showing contents:     std::map<int,d_o_number>::iterator = d_o_map.begin();     std::cout << "d_o_map contains:\n";     (it=d_o_map.begin(); it!=d_o_map.end(); ++it)         std::cout << it->first << " => " << it->second.d_number<<","<<it->second.o_number << '\n';      return 0; }