Question

I’m using Qt now.

I’ve written a C++ class A and there are some public functions in it. And now, I’m writing a Qt class B which has multiple inheritences from both QObject and A.

And I want to change one public function in A to public slots in B.

Can it be possible?

Answer 1

You can do that by simply creating a slot in B and delegating to A‘s function in there.
Here’s an example:

#include <QtCore>

class A {
    public:
        A() {}
        void foo() { qDebug() << "In A::foo()"; }
};

class B: public QObject, public A {
    Q_OBJECT

    public:
        B(QObject *parent=0): QObject(parent), A() {
            connect(this, SIGNAL(fire()), this, SLOT(foo()));
        }
    public slots:
        void foo() {
            qDebug() << "In slot B::foo()";
            A::foo();
        }
    signals:
        void fire();
    public:
        void test() { emit fire(); }
};

Class A doesn’t need to be “aware” of Qt at all.