test_map_insert.cpp

#include <algorithm>
#include <iostream>
#include <iterator>
#include <map>
#include <utility>

using namespace std;
typedef map<int,int> my_map;

// WARNING: Altering the std namespace is UB.
// Is specializing ostream_iterator<> for std::pair<int,int> the proper form?
namespace std
{
  ostream& operator << (ostream& os, const my_map::value_type& right)
  {
    return os << "[" << right.first << "," << right.second<< "]";
  }
}

int main()
{
  cout << "Hello world." << endl;

  my_map source;
  source.insert(make_pair(1,1));
  source.insert(make_pair(2,2));
  source.insert(make_pair(3,3));
  
  my_map destination;
  destination.insert(make_pair(2,465));
  destination.insert(source.begin(), source.end());
  
  copy(destination.begin(), destination.end(),
       ostream_iterator<my_map::value_type>  (cout,", "));
  cout << endl;
}