QList of pointers

[Farcaller]

I have such a code:

static QList<display_list*> displayLists;

static QList<display_list*> displayLists;

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items are added this way:

list = new display_list();
list->new_list(GL_COMPILE);
glBegin(GL_QUADS);
...
glEnd();
list->end_list();
displayLists.append(list);

list = new display_list();
list->new_list(GL_COMPILE);
glBegin(GL_QUADS);
...
glEnd();
list->end_list();
displayLists.append(list);

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The problem is if I need to clear list and generate otehr display lists than displayLists.clear() is a bad choice - ~display_list() is not called for elements, in fact lists still reside in OpenGL memory. Currently I have such a header in function, that generates this list:

void prepareLists()
{
	if(!displayLists.isEmpty())
		foreach(display_list* ptr, displayLists) delete ptr;
	displayLists.clear();
	...

void prepareLists()
{
	if(!displayLists.isEmpty())
		foreach(display_list* ptr, displayLists) delete ptr;
	displayLists.clear();
	...

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but I don't like it
Any ideas how to make it nice&clean?

PS: display_list is not a QObject