单例模式的写法

#include <QObject>

class emit02 : public QObject

{

    Q_OBJECT

public:

//    explicit emit02(QObject *parent = nullptr);

    static emit02* Get_test_emit();

private:

    emit02();

    static emit02* m_test_emit;

//    emit02(QObject *parent = nullptr);

signals:

    void ts_single01();

public slots:

    void ts_slot01();

};

emit02 *emit02::m_test_emit = NULL;

emit02 *emit02::Get_test_emit()

{

    if (m_test_emit == NULL)

        m_test_emit = new emit02();

    return m_test_emit;

}

emit02::emit02()

{

        connect(this,SIGNAL(ts_single01()),this,SLOT(ts_slot01()));

}

void emit02::ts_slot01()

{

    qDebug() << "this is ts_slot01 function!";

}

 

来源：CSDN

作者：hanhanluma

链接：https://blog.csdn.net/qq_39027296/article/details/104753635