std::vector< int > * chain = 0;
if ( QListWidgetItem * item = myListWidget->currentItem() )
{
- int i = item->data( Qt::UserRole ).toInt();
+ size_t i = (size_t) item->data( Qt::UserRole ).toInt();
if ( 0 <= i && i < myChains.size() )
chain = & myChains[i];
}