Qt:在析构函数[duplicate]中删除QMainWindow的中心小部件时程序崩溃

QMainWindow . 正如我在互联网上使用的一些例子所建议的那样 QWidget 用于 setCentralWidget(QWidget*) QWidget公司 程序正在崩溃。

class MyMainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MyMainWindow(QWidget *parent = 0);
    ~MyMainWindow();

private:
    QVBoxLayout m_p1_level_vbox;
    QHBoxLayout m_p2_level_vbox;
    QHBoxLayout m_p2_level_hbox;
    QWidget* m_central_widget;
    QPushButton* m_increase_pressure;
    QPushButton* m_decrease_pressure;
};

对于.cpp

MyMainWindow::MyMainWindow(QWidget *parent)
    : QMainWindow(parent)
    , m_central_widget(new QWidget(this))
    , m_increase_pressure(new QPushButton("+", this))
    , m_decrease_pressure(new QPushButton("-", this))
{
    m_p2_level_hbox.addWidget(m_increase_pressure);
    m_p2_level_hbox.addWidget(m_decrease_pressure);

    m_p1_level_vbox.addLayout(&m_p2_level_hbox);

    m_central_widget->setLayout(&m_p1_level_vbox);
    setCentralWidget(m_central_widget);
}

MyMainWindow::~MyMainWindow()
{
    delete m_central_widget; // commenting this line doesn't  crash the program
    delete m_increase_pressure;
    delete m_decrease_pressure;
}

主.cpp

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyMainWindow w;
    w.show();
    return a.exec();
}

如果我不删除 m_central_widget 那就行了。