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# Qt 3 Support Members for QMap

The following class members are part of the Qt 3 support layer. They are provided to help you port old code to Qt 4. We advise against using them in new code.

- QMap class reference

### Public Functions

- void erase ( const Key & key )
- iterator insert ( const Key & key, const T & value, bool overwrite )
- iterator remove ( iterator it )
- iterator replace ( const Key & key, const T & value )

## Member Function Documentation

### void QMap::erase ( const Key & key )

This is an overloaded member function, provided for convenience.

Use remove(key) instead.

### iterator QMap::insert ( const Key & key, const T & value, bool overwrite )

This is an overloaded member function, provided for convenience.

Use the two-argument insert() overload instead. If you don't want to overwrite, call contains() beforehand.

For example, if you have code like

        QMap<QString, int> map;
        ...
        map.insert("delay", 30000, false);

you can rewrite it as

        QMap<QString, int> map;
        ...
        if (!map.contains("delay"))
            map.insert("delay", 30000);

### iterator QMap::remove ( iterator it )

This is an overloaded member function, provided for convenience.

Use erase(it) instead.

### iterator QMap::replace ( const Key & key, const T & value )

Use remove() then insert().