[Kde-games-devel] test QPtrList existence ?

[cantabile]

Hi, 
I encounter a simple problem with QPtrList, but can't see why:
when my game is ending, I call a clear() function, which erase the
values in a QPtrList<QCanvasItems>.

When the list has not been used (e.g I call a new game at the start,
without erasing any value in the list), no problem, but when it's been
used, I get a crash pointing to my clear() methtod.

Here's the method :

void KMatchesView::clear()
{
	if (!matchesList.isEmpty())	
	for (uint i=0; i< matchesList.count() ; i++) {
                QCanvasItem* match = matchesList.at(i);
                if (match->rtti() == matchRTTI) {
                        delete match;
			}
        }
        //this is the list where are stored pointers to canvas items
	matchesList.clear();

}

Here's the method where I erase item in game :
void KMatchesView::play()
{
	// iterator of the list of selected sprites
	QValueList<int>::Iterator it;
        for (it = selectedList.begin(); it !=selectedList.end();it++)
		delete matchesList.at(*it);
        }
        selectedList.clear();
}

Is there something wrong in these methods ?
Is there a way to test if a QPtrList exists (like if (matchesList) ...)
?
Thanks.