Qt 槽函数重载时通过函数指针绑定

信号

public slots:
    void testShow();
    void testShow(int a);

signals:
    void show(int a);

槽函数

void A::testShow(){
    qDebug() <<"testShow(" + QString::number(1) + ")" << QThread::currentThreadId();
}
void A::testShow(int a){
    qDebug() <<"testShow(" + QString::number(a) + ")" << QThread::currentThreadId();
}

绑定

void (A:: *testShow_)(int) = &A::testShow;
QObject::connect(this, &A::show, this, testShow_);