std::multimap::swap

// swap multimaps
#include <iostream>
#include <map>
int main ()
{
  std::multimap<char,int> foo,bar;
  foo.insert(std::make_pair('x',100));
  foo.insert(std::make_pair('y',200));
  bar.insert(std::make_pair('a',11));
  bar.insert(std::make_pair('b',22));
  bar.insert(std::make_pair('a',55));
  foo.swap(bar);
  std::cout << "foo contains:\n";
  for (std::multimap<char,int>::iterator it=foo.begin(); it!=foo.end(); ++it)
    std::cout << (*it).first << " => " << (*it).second << '\n';
  std::cout << "bar contains:\n";
  for (std::multimap<char,int>::iterator it=bar.begin(); it!=bar.end(); ++it)
    std::cout << (*it).first << " => " << (*it).second << '\n';
  return 0;
}