On Sat, 15 Jul 2023 at 04:02, Ken Matsui via Libstdc++ < libstd...@gcc.gnu.org> wrote:
> This patch uses __bool_constant entirely instead of integral_constant<bool> > in the type_traits header, specifically for true_type, false_type, > and bool_constant. > > libstdc++-v3/ChangeLog: > > * include/std/type_traits (true_type): Use __bool_constant > instead. > (false_type): Likewise. > (bool_constant): Likewise. > > Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org> > --- > libstdc++-v3/include/std/type_traits | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) > > diff --git a/libstdc++-v3/include/std/type_traits > b/libstdc++-v3/include/std/type_traits > index 9f086992ebc..7dc5791a7c5 100644 > --- a/libstdc++-v3/include/std/type_traits > +++ b/libstdc++-v3/include/std/type_traits > @@ -78,24 +78,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > constexpr _Tp integral_constant<_Tp, __v>::value; > #endif > > - /// The type used as a compile-time boolean with true value. > - using true_type = integral_constant<bool, true>; > - > - /// The type used as a compile-time boolean with false value. > - using false_type = integral_constant<bool, false>; > - > /// @cond undocumented > /// bool_constant for C++11 > template<bool __v> > using __bool_constant = integral_constant<bool, __v>; > /// @endcond > > + /// The type used as a compile-time boolean with true value. > + using true_type = __bool_constant<true>; > + > + /// The type used as a compile-time boolean with false value. > + using false_type = __bool_constant<false>; > + > #if __cplusplus >= 201703L > # define __cpp_lib_bool_constant 201505L > /// Alias template for compile-time boolean constant types. > /// @since C++17 > template<bool __v> > - using bool_constant = integral_constant<bool, __v>; > + using bool_constant = __bool_constant<__v>; > #endif > > // Metaprogramming helper types. > > This seems a bit pointless IMHO, but I suppose it makes things more consistent. OK for trunk.
