Re: [boost] review request: addition to type_traits library of is_less_comparable<T, U> and others

First, I'd like to say I think this would be a useful addition to Boost.TypeTraits, and I appreciate your work Frederic ;) Thanks!

2) At the very least, boost::tribool is a legitimate return value (in addition to bool) for any of the comparison operators, which indicates to me that the interface should allow specification of the result type of a comparison operator.

I will try to make the checked return type a template defaulted to bool but I am not sure it will work. Frédéric