user data in signals

[Christopher Harvey <chris basementcode com>]

I've got a button signal handler, so it takes no parameters. I was
wondering if there was some way I could send "user data" when the signal
is connected.

something like this:

void handlePress(int buttonID) {
   //I use buttonID here
}

int main() {
   b1.signal_clicked().connect(ptr_fun(handlePress(1)));
   b2.signal_clicked().connect(ptr_fun(handlePress(2)));
   b3.signal_clicked().connect(ptr_fun(handlePress(3)));
}

Doesn't plain gtk support something like this?