POSITION GetHeadPosition() const;
Gets the position of the head element of this list.
A POSITION value that can be used for iteration or object pointer retrieval; NULL if the list is empty.
CObList list;
POSITION pos;
list.AddHead( new CAge( 21 ) );
list.AddHead( new CAge( 40 ) ); // List now contains (40, 21)
if( ( pos = list.GetHeadPosition()) != NULL )
{
ASSERT( *(CAge*) list.GetAt( pos ) == CAge( 40 ) );
}