Re: Derived interfaces : An Example Solution

[murrayc t-online de (Murray Cumming)]

n Sun, 2001-11-04 at 08:19, Jeff Franks wrote:
>   Murray Cumming wrote:
> 
> >So, if interfaces can't really be inherited, what does this do:
> >gpointer g_type_interface_peek_parent (gpointer g_iface)
> >?
> >
> 
> Translating the GTK interfaces into C++ was tricky. You can only derive 
> an interface from G_TYPE_INTERFACE, not an exisitng interface.

I'm not sure that's what Owen said in his other email, though it doesn't
seem to be coded like normal gobject inheritance.
g_type_add_interface_static() seems to recognise the inheritance
relationship of it's Interface (e.g. GtkTreeModel) and IFace (e.g.
GTreeModelIFace) types.

I am pleased to see that you seem to be using
g_type_interface_peek_parent() to get the original *IFace, in the same
way as gtkmm-1.3, because I wasn't very sure of that part.

I have already implemented the shared Instance base for the
multiply-inherited Objects and Interfaces classes, as you said before.
Our code is now much the same.

-- 
Murray Cumming
murrayc usa net
www.murrayc.com