[sigc] Re: binding by value, slot taking reference was Re: [gtkmm] binding arguments to slots

[Martin Schulze <martin-ml hippogriff de>]

Am 2003.11.18 00:45 schrieb(en) gtkmm mailing list account:
> Bonsoir,
> Thank you for your help.
> Le Lundi 17 Novembre 2003 19:41, Martin Schulze a écrit :
> > Am 2003.11.17 15:23 schrieb(en) gtkmm mailing list account:
> > > It look like there is a stringent limitation on the number of
> > > arguents
> > >
> > > :-(
> >
> > The limitation will be lifted in libsigc++-2.0.
>
> Cool !
> <snip>
> >
> > > Is there a way to expand it (recompiling libsigc++1.2 ) ?
> >
> > Yes. You have to edit sigc++/macros/bind.h.m4. The last "paragraph"
> > of the file is of interest. Add ADAPTOR_BIND_DATA(ARGS(C,3)), etc.;
> > maybe also some ADAPTOR_BIND_SLOT(...) commands are needed.
>
> Thank you, I'll try, but I think I will wait for libsigc++-2.0.
>
> There is still something I don't understand with slot and bind :
>
> I would like to make a slot for a function taking arguments by
> reference:
> program :
> "
> using namespace std;
> using namespace SigC;
>
> void foo1(int& i){++i;}
>
> int main(int argc, char** argv){
> int i=1;
> Slot0<void>slot1=bind(slot(foo1),i);
>  return 0;
> }

Try to specify the argument type as template parameter, i.e.:

  Slot0<void> slot1 = bind<int&>(slot(foo1), i);

I'm not sure if it works, though - let us know!

BTW in libsigc++-2.0 you will be able to write:

  sigc::slot<void> slot1 = sigc::bind(foo1, sigc::ref(i));

instead.

Regards,

  Martin