Re: Wrapping variable argument functions

[José Alburquerque <jaalburquerque cox net>]

José Alburquerque wrote:
> José Alburquerque wrote:
>   
> > Murray Cumming wrote:
> >     
> > > On Wed, 2008-02-06 at 14:32 -0500, José Alburquerque wrote:
> > >  
> > >       
> > > > Hi.  I have a general question about gmmproc:  Can it wrap methods 
> > > > with variable arguments?  For example would  _WRAP_METHOD(void 
> > > > method(int field1, ...), c_function) work if the c_function accepts 
> > > > the same variable argument list as the method?  Thanks.
> > > >     
> > > >         
> > > No. These are generally convenience functions for C, which usually
> > > repeatedly call other functions that we do wrap. We don't generally
> > > want ... arguments in C++ because they are not at all type-safe.
> > >
> > >   
> > >       
> > I'm looking at two functions in gstreamer (the GstCaps 
> > gst_caps_set_simple and the GstStructure gst_structure_set functions) 
> > that are giving me a bit of trouble.  They're meant to set a series of 
> > fields in the Caps and Structure.  What would I do in a case like 
> > this?  Thanks.
> >
> > -Jose
> >
> >     
> In both cases, they seem to call a ..._set_valist() related function do 
> I use these?
>
>   
You know, I think I'll do something like what happens with 
Gst::Element::link() which returns the element so another link can be 
called right after, as in:

element->link(one)->link(two);

So the syntax would look like:

pad->set(f1)->set(f2).  Would this work?  Thanks.

-Jose
> -Jose
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