The type_traits webpage contains the following, from which
is_base_and_derived should be removed:
>Note that both is_convertible, and is_base_and_derived can produce
>compiler errors if the convertion is ambiguous:
>
>struct A {};
>struct B : A {};
>struct C : A {};
>struct D : B, C {};
>bool const x = boost::is_base_and_derived<A,D>::value; // error
>bool const y = boost::is_convertible<D*,A*>::value; // error
--
Mike Conley
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