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

[José Alburquerque <jaalburquerque cox net>]

José Alburquerque wrote:
> Murray Cumming wrote:
>   
> > On Tue, 2008-01-29 at 23:48 -0500, José Alburquerque wrote:
> >   
> >     
> > > I'm wondering, would anyone know how to convert a Glib::ValueBase to one 
> > > of its derived types (such as Glib::Value<int>) assuming the derived 
> > > type has been returned from a function as the base class 
> > > Glib::ValueBase?
> > >     
> > >       
> > 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?

-Jose