How to deal with GBoxed values and methods

[Andreas Rottmann]

Hi!

I recently made a change in G-Wrap that should enhance the generic
support. Methods are now specialized on all arguments, and arguments
can also be specialized on basic types, such as <string>. 

This breaks guile-gnome, however, since the values passed around do
not always have the proper class; for instance, we have "GBoxed"
types, which are passed around as GValue smobs (see
gw-spec-utils.scm). One example for this is GtkTreeIter values. To fix
this issue, we must find a way to pass these values as instances of
their class, e.g. <gtk-tree-iter>, so instances/objects of the class
must have a "slot" where we can store the C pointer. 

I'm not yet sure of all the implications that will have, but it seems
we at least have to extend gtype->class, making it create that slot in
the base case (no superclasses). The slot could be just an opaque
smob, or it could be a gboxed value as it is now.

Thoughts?

Regards, Rotty
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A. Because it breaks the logical sequence of discussion
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