std::unordered_map::cbegin

// unordered_map::cbegin/cend example
#include <iostream>
#include <unordered_map>
int main ()
{
  std::unordered_map<std::string,std::string> mymap;
  mymap = {{"Australia","Canberra"},{"U.S.","Washington"},{"France","Paris"}};
  std::cout << "mymap contains:";
  for ( auto it = mymap.cbegin(); it != mymap.cend(); ++it )
    std::cout << " " << it->first << ":" << it->second;  // cannot modify *it
  std::cout << std::endl;
  std::cout << "mymap's buckets contain:\n";
  for ( unsigned i = 0; i < mymap.bucket_count(); ++i) {
    std::cout << "bucket #" << i << " contains:";
    for ( auto local_it = mymap.cbegin(i); local_it!= mymap.cend(i); ++local_it )
      std::cout << " " << local_it->first << ":" << local_it->second;
    std::cout << std::endl;
  }
  return 0;
}