Calling multiple slots using a signal

tomy

Hi all,

Is there any better way to connect a signal to more than a slot than the one below, please?

connect(sender1, SIGNAL(triggered()), this, SLOT(foo_1()));
connect(sender1, SIGNAL(triggered()), this, SLOT(foo_2()));
connect(sender1, SIGNAL(triggered()), this, SLOT(foo_3()));

? Offline

Hi! Better in what regard?

tomy

@Wieland

Hi! Better in what regard?

Good question! I meant the way professionals use.

? Offline

Well, you could save pointers to the slots in a vector and then do stuff like this:

    using foo_p =  void (MainWindow::*)();
    
    QVector<foo_p> fps;
    fps << &MainWindow::foo_1;
    fps << &MainWindow::foo_2;
    // ...
    fps << &MainWindow::foo_100;

    for (auto f: fps)
        connect(this, &MainWindow::triggered, this, f);

tomy

@Wieland
Not been taught these as they are rather advanced. For the time being I use the first version.
Thanks.

mrjj

@tomy
Hi
What wieland shows is just normal c++.
It is not considered advanced as such.
But yes, you could say for a c++ beginner, function pointers might be advanced.
He just put pointers to member functions in a list and
loop over them to connect them all.
If you had 200, it would be a much better design that a load of
connect statements.

Anyway, its not really common to connect same signal to different slot in same class. You might as well fall foo_2 and foo_3 from foo_1.

But if the foo_x each lives in own classes, then its a pretty normal design.