Is it possible to connect a signal to a static slot without a receiver instance?

Question

Is it possible to connect a signal to static slot without receiver instance?

Like this: connect(&object, SIGNAL(some()), STATIC_SLOT(staticFooMember()));

Answer 1

It is. (With Qt5)

#include 
#include 

void foo(){
    qDebug() << "focusChanged";
}


int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    QObject::connect(&app, &QApplication::focusChanged, foo);
    return app.exec();
}