[Bug libstdc++/59027] std::is_signed does not include check for is_arithmetic

[marc.mutz at kdab dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59027

Marc Mutz <marc.mutz at kdab dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |---

--- Comment #3 from Marc Mutz <marc.mutz at kdab dot com> ---
See code posted in http://llvm.org/bugs/show_bug.cgi?id=17834
is_unsigned<MouseButton> fails, !is_signed succeeds. MouseButton is an enum.