CObList::RemoveAt
voidRemoveAt(POSITIONposition**);**
Parameters
position
The position of the element to be removed from the list.
Remarks
Removes the specified element from this list.
When you remove an element from a CObList, you remove the object pointer from the list. It is your responsibility to delete the objects themselves.
You must ensure that your POSITION value represents a valid position in the list. If it is invalid, then the Debug version of the Microsoft Foundation Class Library asserts.
Example
Be careful when removing an element during a list iteration. The following example shows a removal technique that guarantees a valid POSITION value for GetNext.
See CObList::CObList for a listing of the CAge class.
CObList list;
POSITION pos1, pos2;
CObject* pa;
list.AddHead( new CAge( 21 ) );
list.AddHead( new CAge( 40 ) );
list.AddHead( new CAge( 65 ) ); // List now contains (65 40, 21).
for( pos1 = list.GetHeadPosition(); ( pos2 = pos1 ) != NULL; )
{
if( *(CAge*) list.GetNext( pos1 ) == CAge( 40 ) )
{
pa = list.GetAt( pos2 ); // Save the old pointer for
//deletion.
list.RemoveAt( pos2 );
delete pa; // Deletion avoids memory leak.
}
}
#ifdef _DEBUG
afxDump.SetDepth( 1 );
afxDump << "RemoveAt example: " << &list << "\n";
#endif
The results from this program are as follows:
RemoveAt example: A CObList with 2 elements
a CAge at $4C1E 65
a CAge at $4B22 21