Declare a reverse iterator to a map : map iterator « map multimap « C++ Tutorial

1. C++ Tutorial
2. map multimap
3. map iterator

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main() {
  map<string, int> m;

  m.insert(pair<string, int>("A", 100));
  m.insert(pair<string, int>("G", 300));
  m.insert(pair<string, int>("B", 200));

  // Declare an iterator to a map<string, int>.
  map<string, int>::iterator itr;

  // Declare a reverse iterator to a map<string, itr>.
  map<string, int>::reverse_iterator ritr;

  // show the contents of m in reverse order.
  cout << "The contents of m in reverse:\n";

  for(ritr=m.rbegin(); ritr != m.rend(); ++ritr)
    cout << "  " << ritr->first << ", " << ritr->second << endl;
  cout << endl;


  return 0;
}