//this->>ucd_parent is a derived qgraphicsitem an is an instance of the same class as this itself
//items is a QList<T*> - with T = typeof(this)
for (i = this->ucd_parent->items.begin(); i != this->ucd_parent->items.end(); ++i) {
	if(*i == this) {
		*i = item;
	}
}