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Re: [v3] add_unsigned/remove_unsigned tweaks


Howard Hinnant wrote:

I'm asking because __add_unsigned builds on __is_integer and impacts how we handle __add_unsigned with cv-qualified integral types.

In my opinion, the "new traits" should behave consistently with the other traits in TR1 and the working paper ones wrt cv-qualification. On the other hand, at present, it's not an option using std::tr1::is_integral and other non-uglified names in the implementation of ext/type_traits.h (supposedly available also to the users of the library) and the legacy cpp_type_traits.h.


All in all, probably the best way to go is using something like your clever __union_cv for __add_unsigned and possibly, as a backward compatible change, for cpp_type_traits traits, it would not add so much code, after all.

Paolo.


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