c++ - 隐藏的重载虚函数 OSX QT4

Question

编译时我的 mac 上的 QT4 有问题

In file included from playlistWidget.cpp:16: ./playlistWidget.h:121:16: warning: 'NPlaylistWidget::mimeData' hides overloaded virtual function [-Woverloaded-virtual] QMimeData *mimeData(const QList items) const; ^ /opt/local/libexec/qt4/Library/Frameworks/QtGui.framework/Versions/4/Headers/qlistwidget.h:280:24: note: hidden overloaded virtual function 'QListWidget::mimeData' declared here: type mismatch at 1st parameter ('const QList' vs 'const QList') virtual QMimeData *mimeData(const QList items) const; ^

我的代码:

private:
        QPointer<QDrag> m_itemDrag;
        bool m_fileDrop;
        QList<QUrl> m_mimeDataUrls;
        QStringList mimeTypes() const;
        QMimeData *mimeData(const QList<NPlaylistWidgetItem *> items) const;
        bool dropMimeData(int index, const QMimeData *data, Qt::DropAction action);
    #ifdef Q_WS_MAC
        Qt::DropActions supportedDropActions() const;
    #endif
    protected:
        void dropEvent(QDropEvent *event);
        void dragEnterEvent(QDragEnterEvent *event);
        void dragMoveEvent(QDragMoveEvent *event);
        void dragLeaveEvent(QDragLeaveEvent *event);
        void mouseMoveEvent(QMouseEvent *event);

我该如何解决？

Answer 1

函数签名是: QMimeData *mimeData(const QList<QListWidgetItem *> items) const

您的 QList 由 NPlaylistWidgetItem * 参数化，用于签名:
QMimeData *mimeData(const QList<NPlaylistWidgetItem *> items) const

将参数更改为 QListWidgetItem * 应该没问题。通常建议至少使用 -Wall -Wextra -Werror 进行编译