Rani Sharoni posted one possible implementation on http://tinyurl.com/459q
(c.l.c++.m, 2002-07-11, topic 'is_abstract_class implementation!').
The implementation depends on border-case C++ feature (more in Rani's text).
I compiled it sucessfully with Comeau online compiler.
It may be considered as addition to type_traits library, after the standard
settles on it.
is_abstract_class<T> may be useful e.g. to enforce "don't derive from
non-abstract classes" constraint.
/Pavel
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