On Fri, 12 May 2023, Ken Matsui via Libstdc++ wrote:

> It appears that GCC 13 has been released, but I am wondering if there
> are any issues preventing this patch from being merged yet. Can you
> provide any information on this?

Thanks for the reminder, I pushed this to trunk just now
(r14-940-g637edefc5863cf). Congrats on your first libstdc++ commit!

> 
> On Sat, Apr 8, 2023 at 2:08 PM Ken Matsui <kmatsui@cs.washington.edu> wrote:
> >
> > I see. Thank you!
> >
> > On Sat, Apr 8, 2023 at 12:52 AM Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> > >
> > > This looks good, thanks, but we're too close to the gcc 13 release now, and this isn't fixing any bugs. I'll push it after the release.
> > >
> > >
> > > On Thu, 23 Mar 2023, 11:07 Ken Matsui via Libstdc++, <libstdc++@gcc.gnu.org> wrote:
> > >>
> > >> In the type_traits header, both integral_constant<bool> and __bool_constant
> > >> are used. This patch unifies those usages into __bool_constant.
> > >>
> > >> libstdc++-v3/ChangeLog:
> > >>
> > >>         * include/std/type_traits: Use __bool_constant instead of
> > >>         integral_constant.
> > >>
> > >> Signed-off-by: Ken Matsui <kmatsui@cs.washington.edu>
> > >> ---
> > >>  libstdc++-v3/include/std/type_traits | 32 ++++++++++++++--------------
> > >>  1 file changed, 16 insertions(+), 16 deletions(-)
> > >>
> > >> diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
> > >> index 2bd607a8b8f..bc6982f9e64 100644
> > >> --- a/libstdc++-v3/include/std/type_traits
> > >> +++ b/libstdc++-v3/include/std/type_traits
> > >> @@ -578,19 +578,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// is_enum
> > >>    template<typename _Tp>
> > >>      struct is_enum
> > >> -    : public integral_constant<bool, __is_enum(_Tp)>
> > >> +    : public __bool_constant<__is_enum(_Tp)>
> > >>      { };
> > >>
> > >>    /// is_union
> > >>    template<typename _Tp>
> > >>      struct is_union
> > >> -    : public integral_constant<bool, __is_union(_Tp)>
> > >> +    : public __bool_constant<__is_union(_Tp)>
> > >>      { };
> > >>
> > >>    /// is_class
> > >>    template<typename _Tp>
> > >>      struct is_class
> > >> -    : public integral_constant<bool, __is_class(_Tp)>
> > >> +    : public __bool_constant<__is_class(_Tp)>
> > >>      { };
> > >>
> > >>    /// is_function
> > >> @@ -784,7 +784,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// is_trivial
> > >>    template<typename _Tp>
> > >>      struct is_trivial
> > >> -    : public integral_constant<bool, __is_trivial(_Tp)>
> > >> +    : public __bool_constant<__is_trivial(_Tp)>
> > >>      {
> > >>        static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
> > >>         "template argument must be a complete class or an unbounded array");
> > >> @@ -793,7 +793,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// is_trivially_copyable
> > >>    template<typename _Tp>
> > >>      struct is_trivially_copyable
> > >> -    : public integral_constant<bool, __is_trivially_copyable(_Tp)>
> > >> +    : public __bool_constant<__is_trivially_copyable(_Tp)>
> > >>      {
> > >>        static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
> > >>         "template argument must be a complete class or an unbounded array");
> > >> @@ -802,7 +802,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// is_standard_layout
> > >>    template<typename _Tp>
> > >>      struct is_standard_layout
> > >> -    : public integral_constant<bool, __is_standard_layout(_Tp)>
> > >> +    : public __bool_constant<__is_standard_layout(_Tp)>
> > >>      {
> > >>        static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
> > >>         "template argument must be a complete class or an unbounded array");
> > >> @@ -817,7 +817,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>      struct
> > >>      _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout && is_trivial")
> > >>      is_pod
> > >> -    : public integral_constant<bool, __is_pod(_Tp)>
> > >> +    : public __bool_constant<__is_pod(_Tp)>
> > >>      {
> > >>        static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
> > >>         "template argument must be a complete class or an unbounded array");
> > >> @@ -831,7 +831,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>      struct
> > >>      _GLIBCXX17_DEPRECATED
> > >>      is_literal_type
> > >> -    : public integral_constant<bool, __is_literal_type(_Tp)>
> > >> +    : public __bool_constant<__is_literal_type(_Tp)>
> > >>      {
> > >>        static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
> > >>         "template argument must be a complete class or an unbounded array");
> > >> @@ -840,13 +840,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// is_empty
> > >>    template<typename _Tp>
> > >>      struct is_empty
> > >> -    : public integral_constant<bool, __is_empty(_Tp)>
> > >> +    : public __bool_constant<__is_empty(_Tp)>
> > >>      { };
> > >>
> > >>    /// is_polymorphic
> > >>    template<typename _Tp>
> > >>      struct is_polymorphic
> > >> -    : public integral_constant<bool, __is_polymorphic(_Tp)>
> > >> +    : public __bool_constant<__is_polymorphic(_Tp)>
> > >>      { };
> > >>
> > >>  #if __cplusplus >= 201402L
> > >> @@ -855,14 +855,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// @since C++14
> > >>    template<typename _Tp>
> > >>      struct is_final
> > >> -    : public integral_constant<bool, __is_final(_Tp)>
> > >> +    : public __bool_constant<__is_final(_Tp)>
> > >>      { };
> > >>  #endif
> > >>
> > >>    /// is_abstract
> > >>    template<typename _Tp>
> > >>      struct is_abstract
> > >> -    : public integral_constant<bool, __is_abstract(_Tp)>
> > >> +    : public __bool_constant<__is_abstract(_Tp)>
> > >>      { };
> > >>
> > >>    /// @cond undocumented
> > >> @@ -873,7 +873,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>
> > >>    template<typename _Tp>
> > >>      struct __is_signed_helper<_Tp, true>
> > >> -    : public integral_constant<bool, _Tp(-1) < _Tp(0)>
> > >> +    : public __bool_constant<_Tp(-1) < _Tp(0)>
> > >>      { };
> > >>    /// @endcond
> > >>
> > >> @@ -1333,7 +1333,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// has_virtual_destructor
> > >>    template<typename _Tp>
> > >>      struct has_virtual_destructor
> > >> -    : public integral_constant<bool, __has_virtual_destructor(_Tp)>
> > >> +    : public __bool_constant<__has_virtual_destructor(_Tp)>
> > >>      {
> > >>        static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
> > >>         "template argument must be a complete class or an unbounded array");
> > >> @@ -1392,7 +1392,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    template<typename _Tp, typename _Up>
> > >>      struct is_same
> > >>  #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME
> > >> -    : public integral_constant<bool, __is_same(_Tp, _Up)>
> > >> +    : public __bool_constant<__is_same(_Tp, _Up)>
> > >>  #else
> > >>      : public false_type
> > >>  #endif
> > >> @@ -1408,7 +1408,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> > >>    /// is_base_of
> > >>    template<typename _Base, typename _Derived>
> > >>      struct is_base_of
> > >> -    : public integral_constant<bool, __is_base_of(_Base, _Derived)>
> > >> +    : public __bool_constant<__is_base_of(_Base, _Derived)>
> > >>      { };
> > >>
> > >>  #if __has_builtin(__is_convertible)
> > >> --
> > >> 2.40.0
> > >>
> 
>