Inheritance graph

FYI, I've messed around with the code in inheritance.cpp / inheritance.hpp
and made it into a real singleton. In this process I also investigated type 
importing,
and to me it seems complicated to try to share any data at all between modules.

Also, I've looked into library configuration. I ended up with one macro;
BOOST_LANGBINDING_TYPE_INFO, which is the type used for type
identification. I also did something like this (python::type_info used for
illustrative purposes):

   typedef BOOST_LANDBINDING_TYPE_INFO type_info;

   template<class T>
   type_info static_type_id(T*, type<python::type_info>)
   { return python::type_id<T>(); }

   template<class T>
   type_info dynamic_type_id(T* p, type<python::type_info>)
   { return type_info(typeid(p)); }

Anyway, nothing is checked in yet.. I'm merging luabind with the 
inheritance code
right now though.

---
Daniel Wallin



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