[Interest] Interface with signals and slots

[Konstantin Shegunov]

Hi,
This compiles for me:

class SignalInterface

{

public:

    virtual void mysignal() = 0;

};


class SignalImplementer : public QObject, public SignalInterface

{

    Q_OBJECT


signals:

    void mysignal() override;

};


However putting signals into an interface I think is rather dubious,
because you won't be able to connect through the interface. I.e. this:

SignalImplementer obj;

QObject::connect(this, &Session::opened, &obj, &SignalInterface::mysignal);


Is going to fail the static assertions in QObject::connect.
You could derive from QObject though and have them in an abstract class.
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