18. std::multimap::equal_range

• equal_range( key ) returns a range that includes all elements for a given key:

  
      typedef multimap< string, int > MMapT;
      typedef MMapT::const_iterator MMIterT;
  
      MMapT amap;
      pair< MMIterT, MMIterT > result = amap.equal_range( "Fred" );
  
      // Print out all values for the key named "Fred"
      for( MMIterT mit = result.first; mit != result.second; mit++ ) {
          cout
              << mit->first
              << " "
              << mit->second
              << endl
              ;
      }