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

[Murray Cumming <murrayc murrayc com>]

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'm writing some code that would conveniently return a 
> derived Glib::ValueBase as a Glib::ValueBase and really don't know how 
> to convert it back to the derived type once it's been returned.  Thanks.
> 
> -Jose

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