15. map::erase

• Use erase( key ) to remove an item:

  
      typedef map< string, int > MapT;
      MapT amap;
      //...
  
      int how_many_erased = amap.erase( "Fred" );
  
      if ( how_many_erased == 1 ) {
          // Fred was in the map, now he's not.
      }