Re: ignoring arguments is portable?

[Owen Taylor <otaylor redhat com>]

Joshua N Pritikin <vishnu pobox com> writes:

> foo.c:
>   void f(gint ok)
>   { g_print("%d\n"); }
>
> bar.c:
>   extern void f(gint, gint, gint, gint);
>   void g()
>   { f(1,2,3,4); }
>
> Can i do this?
>
> The reason i'm asking is that i still can't reliably predict which arguments
> are delivered by a given signal.  However, i'm usually only interested
> in the first or second argument so maybe i can ignore the rest?  It works
> on i386-linux.  :-)

Yes, it is portable, except to platforms that you almost certainly aren't
using.

(It isn't guaranteed by the C standard, but, practically speaking, it
works on all interesting platforms, and GTK+ depends on this internally.)

As for predicting signal args -- you can do this by reading the docs,
looking at the header files, or by querying the arguments using the
introspection facilities.

Regards,
                                        Owen