Re: callback function without arguments

[Shiraz Baig <shiraz_baig yahoo com>]

Thanks. I got the general Idea.
Bye
shiraz
--- Owen Taylor <otaylor redhat com> wrote:
> On Tue, 2003-05-06 at 01:09, Shiraz Baig wrote:
> > I have defined a callback function for "clicking"
> of a
> > button. I have not used the normal form of 
> > 
> >    callback(GtkWidget *widget, gpointer data).
> > 
> > Instead, I have used a callback without any
> arugments.
> > (See the example given below).
> > 
> > My question is 
> > 
> > "Is there anything wrong in doing so, when I do
> not
> > need to dereference the widget or the data?"
> 
> GTK+ relies on this ability in various places
> internally
> and it is quite safe on any machine you are likely
> to
> ever run on. (Though it isn't guaranteed by the C
> standard.)
> 
> Regards,
>                                  Owen
> 
> [
> What you can't do is use a callback with *more*
> arguments
> than it is called with, even if you don't reference
> the extra arguments. This will break various
> assumptions 
> used by the compiler.
> ]
> 
> 


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