C++ (Cpp) QMap::detach示例

// remove a viewport
void caDoubleTabWidget::removePage(int index)
{
    int pageIndex = 0;
    PRINT(printf("we have to remove the page from array for row=%d col=%d\n", row, col));
    if((pageIndex =lookupArrayIndex(row, col)) != -1) {

        // delete this stackwidget page from the array
        deleteArrayIndex(pageIndex);
        QWidget *widget = viewPort->widget(index);
        PRINT(printf("remove widget at stacked widget index=%d with name=%s\n", index, qasc(widget->objectName())));
        viewPort->removeWidget(widget);
        setRow(row);
        setCol(col);

        // now that we deleted a page of the stackwidget we will have to change are lookup array
        // after the deleted page, change key to key -1
        QMap<int, twoInts> lookupNew;
        QMapIterator<int, twoInts> j(lookup);
        while (j.hasNext()) {
            j.next();
            twoInts item;
            item.r = j.value().r;
            item.c = j.value().c;
            if(j.key() > pageIndex) {
                lookupNew.insert(j.key()-1, item);
            } else {
                lookupNew.insert(j.key(), item);
            }
        }
        // and copy it back
        lookup = lookupNew;
        lookupNew.detach();

    } else {
        PRINT(printf("page not found, return\n"));
        return;
    }
}