Re: Converting a Glib::ValueBase to a derived type

[José Alburquerque <jaalburquerque cox net>]

Murray Cumming wrote:
> On Wed, 2008-01-30 at 14:48 -0500, José Alburquerque wrote:      
>   
> > > > Don't do that
> > > > ( Glib::ValueBase get_something() )
> > > >
> > > > Do this:
> > > >   void get_something(Glib::ValueBase& value);
> > > >
> > > > Then it's up to the caller to pass the correct type, and it's up to the
> > > > get_something() to complain at runtime if it's not the correct type.
> > > >
> > > > See, for instance, Gtk::TreeModel
> > > >   
> > > >         
> > > I see; it works better returning value in reference.  Thanks.
> > >   
> > >       
> > I forgot to ask:  How would the "get_something()" know if the value 
> > returned is of the right type?
> >     
>
> I'm not quite sure what you are asking, and the answer probably depends
> on what you are doing? I guess you are trying to wrap a particular C
> function. Which one?
>
>   
I'm looking at the todo comments in lines 65 and 71 of the structure.hg 
file (in gstreamermm).  I'm attempting to define the getter methods of 
the Gst::Structure along with the id_get_value() method (commented 
definition) correctly.

-Jose