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

[jedychen]

QMap<int, QString> mapCity;
mapCity.insert(1,"one");
mapCity.insert(2,"two");
...
mapCity.insert(9,"nine");
...
 
//Now, I want delete 1,2,3.
 
QMap<int, QString>::Iterator it;
for( it = mapCity.begin();  it != mapCity.end();  ++it)
{
    if( it.key() < 4 )
          mapCity.remove( it );  //Is that OK??
}

QMap<int, QString> mapCity;
mapCity.insert(1,"one");
mapCity.insert(2,"two");
...
mapCity.insert(9,"nine");
...

//Now, I want delete 1,2,3.

QMap<int, QString>::Iterator it;
for( it = mapCity.begin();  it != mapCity.end();  ++it)
{
    if( it.key() < 4 )
          mapCity.remove( it );  //Is that OK??
}

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