new << operator for QMap

It would be handy if for

template <class Key, class T>
class QMap

there was an operator

template <class Key, class T>
QMap< Key, T >& QMap< Key, T >::operator<<( const QPair< Key, T >&
new_entry )
{
(*this)[new_entry.first] = new_entry.second;
return *this;
}