How to use QMap::remove() to delete some item?

[caduel]

QMap<int, QString>::Iterator it;
for( it = mapCity.begin(); it != mapCity.end(); ) // remove increment here
{
  if( it.key() < 4 )
     mapCity.remove( it++ ); // this is ok; note POSTFIX operator here
  else
     ++it;
}

QMap<int, QString>::Iterator it;
for( it = mapCity.begin(); it != mapCity.end(); ) // remove increment here
{
  if( it.key() < 4 )
     mapCity.remove( it++ ); // this is ok; note POSTFIX operator here
  else
     ++it;
}

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