Assert in itemviews drag and drop

Storing void * data in the itemviews asserts when used with the standard drag drop system.

If the code in the #if 0 is enabled it works. This seems like a bug.

#include <QtGui>

#if 0 // have to do this to make it not assert

QDataStream &operator<<(QDataStream &ds, const QVariant &var)
{
if (var.userType() == QMetaType::VoidStar)

{ ds << var.userType(); QByteArray voidPtr(sizeof(void*), 0); void *ptr = qVariantValue<void*>(var); memcpy((void*)voidPtr.data(), &ptr, sizeof(void*)); ds << voidPtr; }

else

{ ds << int(0); var.save(ds); }

return ds;
}

QDataStream &operator>>(QDataStream &ds, QVariant &var)
{
int type;
ds >> type;
if (type == 0)

{ var.load(ds); }

else if (type == QMetaType::VoidStar)

{ QByteArray ba; ds >> ba; void *ptr; memcpy(&ptr, (void*)ba.constData(), sizeof(void*)); var = qVariantFromValue<void*>(ptr); }

return ds;
}
#endif

int main(int argc, char * argv[])
{
QApplication app(argc, argv);
QWidget w;
QHBoxLayout *l = new QHBoxLayout(&w);
QTreeWidget *left = new QTreeWidget(&w);
l->addWidget(left);
left->setDragEnabled(true);
QTreeWidget *right = new QTreeWidget(&w);
l->addWidget(right);
right->setAcceptDrops(true);

QTreeWidgetItem *item = new QTreeWidgetItem();
item->setText(0, "Item");
item->setData(0, Qt::UserRole, qVariantFromValue((void*)0));
left->addTopLevelItem(item);
w.show();
return app.exec();
}