Question

I can’t dereference a QMutableListIterator like an STL iterator – with *it.

I’m trying to use QMutableListIterator::value() but my program crashes. What is the right way to do this?

QFileInfoList files;
// populate list
QListIterator<QFileInfo> it(files);
it.toFront();
QFileInfo = it_top.value();
// crash

The error is

ASSERT: "item_exists()" in file /usr/include/qt4/QtCore/qlist.h, line 778

Thanks

Answer 1

I just checked the Qt documentation for “toFront” and it says:

Moves the iterator to the front of the
container (before the first item).

http://doc.trolltech.com/latest/qmutablelistiterator.html#toFront

The Qt Iterators are Java-style iterators which start before the items and end on the last item, the C++ style iterators begin on the first item and end after the last one.