[boost] is_polymorphic and unions (was: Pyste and STL types)

From: David Abrahams (dave_at_[hidden])
Date: 2003-03-18 19:06:32

Nicodemus <nicodemus_at_[hidden]> writes:

>>Is this happening somewhere in the type traits code?  Can you post an
>>instantiation backtrace?
>>  
>
> It seems to be. Here's the error message:

I guess the question here is: "should
is_polymorphic<some_union>::value compile?"

If so, then we have a bug in is_polymorphic.  If not, we should
change all uses of is_polymorphic<T> in 

       boost/python/class.hpp
       boost/python/object/class_converters.hpp
       boost/python/object/inheritance.hpp

to:
         mpl::and_<is_class<T>, is_polymorphic<T> >

You can make this patch yourself in Boost.Python as an interim
measure to see if it makes wrapping unions work.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com