Re: signal

[Mark Roberts <gtkmm manumark de>]

Dear pch0317,

> I choose signal_motion_notify_event() but when I compile my program
> ...
> eBox.set_events(Gdk::ALL_EVENTS_MASK);
> eBox.signal_motion_notify_event().connect(sigc::mem_fun(*this,
> &Interfejs::about));

> the error occur:
> [...]
> /usr/include/sigc++-2.0/sigc++/functors/slot.h:137: error: void value
> not ignored as it ought to be
> [...]

> What am I doing wrong?

It looks as if Interfejs::about has the wrong type. Look at the 
documentation to see what function type signal_motion_notify_event() 
expects. In particular, the error message mentions the return value.

Hope this helps,
Mark Roberts