[boost] [type_traits] is_convertible<noncopyable,To> crashes

Hello, In a post from yesterday (see http://tinyurl.com/hzk5w), Alexei Alexandrov found a rather serious problem with is_convertible in at least MSVC 7.1 and Intel 9.0, namely that is_convertible<From,To> fails to compile when

From is non-copyable, emitting an error message like this:

boost/boost/type_traits/is_convertible.hpp(254): error: class "XXX" has no suitable copy constructor BOOST_STATIC_CONSTANT(bool, value = ... where XXX is the From argument. Needless to say, some fix for this issue would be most welcome. I'm sorry I cannot provide any more help than a mere report of the problem. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo