http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59027
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Marc Mutz from comment #0) > > template<typename _Tp, > bool = is_arithmetic<_Tp>::value> ^^^^^^^^^^^^^^^^^^ > struct __is_signed_helper > : public false_type { }; > > template<typename _Tp> > struct __is_signed_helper<_Tp, true> ^^^^ > : public integral_constant<bool, _Tp(-1) < _Tp(0)> > { }; This looks right to me.