diff --git a/contrib/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h b/contrib/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h
index 0d1ee4185c8c..9126caa9c7e9 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h
@@ -1,33 +1,43 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_ADD_LVALUE_REFERENCE_H
 #define _LIBCPP___TYPE_TRAITS_ADD_LVALUE_REFERENCE_H
 
 #include <__config>
 #include <__type_traits/is_referenceable.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl            { typedef _LIBCPP_NODEBUG _Tp  type; };
+#if __has_builtin(__add_lvalue_reference)
+template <class _Tp>
+struct add_lvalue_reference {
+  using type _LIBCPP_NODEBUG = __add_lvalue_reference(_Tp);
+};
+#else
+template <class _Tp, bool = __libcpp_is_referenceable<_Tp>::value>
+struct __add_lvalue_reference_impl {
+  typedef _LIBCPP_NODEBUG _Tp type;
+};
 template <class _Tp                                       > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp& type; };
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference
 {typedef _LIBCPP_NODEBUG typename  __add_lvalue_reference_impl<_Tp>::type type;};
+#endif // __has_builtin(__add_lvalue_reference)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_ADD_LVALUE_REFERENCE_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/add_pointer.h b/contrib/llvm-project/libcxx/include/__type_traits/add_pointer.h
index aea2490c5d0c..be3f758da4af 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/add_pointer.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/add_pointer.h
@@ -1,41 +1,48 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
 #define _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
 
 #include <__config>
 #include <__type_traits/is_referenceable.h>
 #include <__type_traits/is_same.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/remove_reference.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__add_pointer)
+template <class _Tp>
+struct add_pointer {
+  using type _LIBCPP_NODEBUG = __add_pointer(_Tp);
+};
+#else
 template <class _Tp,
-        bool = __is_referenceable<_Tp>::value ||
-                _IsSame<typename remove_cv<_Tp>::type, void>::value>
-struct __add_pointer_impl
-    {typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;};
+          bool = __libcpp_is_referenceable<_Tp>::value || _IsSame<typename remove_cv<_Tp>::type, void>::value>
+struct __add_pointer_impl {
+  typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;
+};
 template <class _Tp> struct __add_pointer_impl<_Tp, false>
     {typedef _LIBCPP_NODEBUG _Tp type;};
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer
     {typedef _LIBCPP_NODEBUG typename __add_pointer_impl<_Tp>::type type;};
+#endif // __has_builtin(__add_pointer)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h b/contrib/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h
index b2a1428095d8..be01d4ec5ba8 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h
@@ -1,33 +1,43 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
 #define _LIBCPP___TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
 
 #include <__config>
 #include <__type_traits/is_referenceable.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl            { typedef _LIBCPP_NODEBUG _Tp   type; };
+#if __has_builtin(__add_rvalue_reference)
+template <class _Tp>
+struct add_rvalue_reference {
+  using type _LIBCPP_NODEBUG = __add_rvalue_reference(_Tp);
+};
+#else
+template <class _Tp, bool = __libcpp_is_referenceable<_Tp>::value>
+struct __add_rvalue_reference_impl {
+  typedef _LIBCPP_NODEBUG _Tp type;
+};
 template <class _Tp                                       > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp&& type; };
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference
 {typedef _LIBCPP_NODEBUG typename __add_rvalue_reference_impl<_Tp>::type type;};
+#endif // __has_builtin(__add_rvalue_reference)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/decay.h b/contrib/llvm-project/libcxx/include/__type_traits/decay.h
index 2af0c1ca42c3..ced21d81c815 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/decay.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/decay.h
@@ -1,65 +1,72 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_DECAY_H
 #define _LIBCPP___TYPE_TRAITS_DECAY_H
 
 #include <__config>
 #include <__type_traits/add_pointer.h>
 #include <__type_traits/conditional.h>
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/is_array.h>
 #include <__type_traits/is_function.h>
 #include <__type_traits/is_referenceable.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/remove_extent.h>
 #include <__type_traits/remove_reference.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__decay)
+template <class _Tp>
+struct decay {
+  using type _LIBCPP_NODEBUG = __decay(_Tp);
+};
+#else
 template <class _Up, bool>
 struct __decay {
     typedef _LIBCPP_NODEBUG typename remove_cv<_Up>::type type;
 };
 
 template <class _Up>
 struct __decay<_Up, true> {
 public:
     typedef _LIBCPP_NODEBUG typename conditional
                      <
                          is_array<_Up>::value,
                          typename add_pointer<typename remove_extent<_Up>::type>::type,
                          typename conditional
                          <
                               is_function<_Up>::value,
                               typename add_pointer<_Up>::type,
                               typename remove_cv<_Up>::type
                          >::type
                      >::type type;
 };
 
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS decay
 {
 private:
     typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up;
 public:
-    typedef _LIBCPP_NODEBUG typename __decay<_Up, __is_referenceable<_Up>::value>::type type;
+  typedef _LIBCPP_NODEBUG typename __decay<_Up, __libcpp_is_referenceable<_Up>::value>::type type;
 };
+#endif // __has_builtin(__decay)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using decay_t = typename decay<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_DECAY_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/is_referenceable.h b/contrib/llvm-project/libcxx/include/__type_traits/is_referenceable.h
index b97631cc39dd..4b34ec257231 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/is_referenceable.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/is_referenceable.h
@@ -1,33 +1,41 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H
 #define _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H
 
 #include <__config>
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/is_same.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-struct __is_referenceable_impl {
-    template <class _Tp> static _Tp& __test(int);
-    template <class _Tp> static false_type __test(...);
+#if __has_builtin(__is_referenceable)
+template <class _Tp>
+struct __libcpp_is_referenceable : integral_constant<bool, __is_referenceable(_Tp)> {};
+#else
+struct __libcpp_is_referenceable_impl {
+  template <class _Tp>
+  static _Tp& __test(int);
+  template <class _Tp>
+  static false_type __test(...);
 };
 
 template <class _Tp>
-struct __is_referenceable : integral_constant<bool,
-    _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), false_type>::value> {};
+struct __libcpp_is_referenceable
+    : integral_constant<bool, _IsNotSame<decltype(__libcpp_is_referenceable_impl::__test<_Tp>(0)), false_type>::value> {
+};
+#endif // __has_builtin(__is_referenceable)
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/make_signed.h b/contrib/llvm-project/libcxx/include/__type_traits/make_signed.h
index fbc31172a978..c36e2292f16f 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/make_signed.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/make_signed.h
@@ -1,76 +1,83 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_MAKE_SIGNED_H
 #define _LIBCPP___TYPE_TRAITS_MAKE_SIGNED_H
 
 #include <__config>
 #include <__type_traits/apply_cv.h>
 #include <__type_traits/is_enum.h>
 #include <__type_traits/is_integral.h>
 #include <__type_traits/nat.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/type_list.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__make_signed)
+template <class _Tp>
+struct make_signed {
+  using type _LIBCPP_NODEBUG = __make_signed(_Tp);
+};
+#else
 typedef
     __type_list<signed char,
     __type_list<signed short,
     __type_list<signed int,
     __type_list<signed long,
     __type_list<signed long long,
-#ifndef _LIBCPP_HAS_NO_INT128
+#  ifndef _LIBCPP_HAS_NO_INT128
     __type_list<__int128_t,
-#endif
+#  endif
     __nat
-#ifndef _LIBCPP_HAS_NO_INT128
+#  ifndef _LIBCPP_HAS_NO_INT128
     >
-#endif
+#  endif
     > > > > > __signed_types;
 
 template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value>
 struct __make_signed {};
 
 template <class _Tp>
 struct __make_signed<_Tp, true>
 {
     typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type;
 };
 
 template <> struct __make_signed<bool,               true> {};
 template <> struct __make_signed<  signed short,     true> {typedef short     type;};
 template <> struct __make_signed<unsigned short,     true> {typedef short     type;};
 template <> struct __make_signed<  signed int,       true> {typedef int       type;};
 template <> struct __make_signed<unsigned int,       true> {typedef int       type;};
 template <> struct __make_signed<  signed long,      true> {typedef long      type;};
 template <> struct __make_signed<unsigned long,      true> {typedef long      type;};
 template <> struct __make_signed<  signed long long, true> {typedef long long type;};
 template <> struct __make_signed<unsigned long long, true> {typedef long long type;};
-#ifndef _LIBCPP_HAS_NO_INT128
+#  ifndef _LIBCPP_HAS_NO_INT128
 template <> struct __make_signed<__int128_t,         true> {typedef __int128_t type;};
 template <> struct __make_signed<__uint128_t,        true> {typedef __int128_t type;};
-#endif
+#  endif
 
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS make_signed
 {
     typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type;
 };
+#endif // __has_builtin(__make_signed)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_MAKE_SIGNED_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/make_unsigned.h b/contrib/llvm-project/libcxx/include/__type_traits/make_unsigned.h
index 8110a5ca9609..6d4e482a8d97 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/make_unsigned.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/make_unsigned.h
@@ -1,89 +1,96 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_MAKE_UNSIGNED_H
 #define _LIBCPP___TYPE_TRAITS_MAKE_UNSIGNED_H
 
 #include <__config>
 #include <__type_traits/apply_cv.h>
 #include <__type_traits/conditional.h>
 #include <__type_traits/is_enum.h>
 #include <__type_traits/is_integral.h>
 #include <__type_traits/is_unsigned.h>
 #include <__type_traits/nat.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/type_list.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__make_unsigned)
+template <class _Tp>
+struct make_unsigned {
+  using type _LIBCPP_NODEBUG = __make_unsigned(_Tp);
+};
+#else
 typedef
     __type_list<unsigned char,
     __type_list<unsigned short,
     __type_list<unsigned int,
     __type_list<unsigned long,
     __type_list<unsigned long long,
-#ifndef _LIBCPP_HAS_NO_INT128
+#  ifndef _LIBCPP_HAS_NO_INT128
     __type_list<__uint128_t,
-#endif
+#  endif
     __nat
-#ifndef _LIBCPP_HAS_NO_INT128
+#  ifndef _LIBCPP_HAS_NO_INT128
     >
-#endif
+#  endif
     > > > > > __unsigned_types;
 
 template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value>
 struct __make_unsigned {};
 
 template <class _Tp>
 struct __make_unsigned<_Tp, true>
 {
     typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type;
 };
 
 template <> struct __make_unsigned<bool,               true> {};
 template <> struct __make_unsigned<  signed short,     true> {typedef unsigned short     type;};
 template <> struct __make_unsigned<unsigned short,     true> {typedef unsigned short     type;};
 template <> struct __make_unsigned<  signed int,       true> {typedef unsigned int       type;};
 template <> struct __make_unsigned<unsigned int,       true> {typedef unsigned int       type;};
 template <> struct __make_unsigned<  signed long,      true> {typedef unsigned long      type;};
 template <> struct __make_unsigned<unsigned long,      true> {typedef unsigned long      type;};
 template <> struct __make_unsigned<  signed long long, true> {typedef unsigned long long type;};
 template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;};
-#ifndef _LIBCPP_HAS_NO_INT128
+#  ifndef _LIBCPP_HAS_NO_INT128
 template <> struct __make_unsigned<__int128_t,         true> {typedef __uint128_t        type;};
 template <> struct __make_unsigned<__uint128_t,        true> {typedef __uint128_t        type;};
-#endif
+#  endif
 
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS make_unsigned
 {
     typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type;
 };
+#endif // __has_builtin(__make_unsigned)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type;
 #endif
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr
 typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept {
     return static_cast<typename make_unsigned<_Tp>::type>(__x);
 }
 #endif
 
 template <class _Tp, class _Up>
 using __copy_unsigned_t = __conditional_t<is_unsigned<_Tp>::value, typename make_unsigned<_Up>::type, _Up>;
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_MAKE_UNSIGNED_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_all_extents.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_all_extents.h
index 075e3acabb44..cc00a61c92b3 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_all_extents.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_all_extents.h
@@ -1,34 +1,41 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_ALL_EXTENTS_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_ALL_EXTENTS_H
 
 #include <__config>
 #include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_all_extents)
+template <class _Tp>
+struct remove_all_extents {
+  using type _LIBCPP_NODEBUG = __remove_all_extents(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents
     {typedef _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]>
     {typedef typename remove_all_extents<_Tp>::type type;};
 template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]>
     {typedef typename remove_all_extents<_Tp>::type type;};
+#endif // __has_builtin(__remove_all_extents)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_ALL_EXTENTS_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_const.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_const.h
index 8efc893e965a..8eefbd099cb3 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_const.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_const.h
@@ -1,28 +1,36 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_CONST_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_CONST_H
 
 #include <__config>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_const)
+template <class _Tp>
+struct remove_const {
+  using type _LIBCPP_NODEBUG = __remove_const(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const            {typedef _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;};
+#endif // __has_builtin(__remove_const)
+
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_CONST_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_cv.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_cv.h
index ce1e4e45c6d1..9e3dee6c46ed 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_cv.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_cv.h
@@ -1,30 +1,38 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_CV_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_CV_H
 
 #include <__config>
 #include <__type_traits/remove_const.h>
 #include <__type_traits/remove_volatile.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_cv)
+template <class _Tp>
+struct remove_cv {
+  using type _LIBCPP_NODEBUG = __remove_cv(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv
 {typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;};
+#endif // __has_builtin(__remove_cv)
+
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_CV_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_cvref.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_cvref.h
index d937501fedce..3af261db3949 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_cvref.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_cvref.h
@@ -1,41 +1,46 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_CVREF_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_CVREF_H
 
 #include <__config>
 #include <__type_traits/is_same.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/remove_reference.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_cvref)
+template <class _Tp>
+using __uncvref_t _LIBCPP_NODEBUG = __remove_cvref(_Tp);
+#else
 template <class _Tp>
 using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type;
+#endif // __has_builtin(__remove_cvref)
 
 template <class _Tp, class _Up>
 struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {};
 
 #if _LIBCPP_STD_VER > 17
 // remove_cvref - same as __uncvref
 template <class _Tp>
 struct remove_cvref {
     using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>;
 };
 
 template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_CVREF_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_extent.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_extent.h
index e353de361616..88da32a4e265 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_extent.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_extent.h
@@ -1,34 +1,41 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_EXTENT_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_EXTENT_H
 
 #include <__config>
 #include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_extent)
+template <class _Tp>
+struct remove_extent {
+  using type _LIBCPP_NODEBUG = __remove_extent(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent
     {typedef _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]>
     {typedef _Tp type;};
 template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]>
     {typedef _Tp type;};
+#endif // __has_builtin(__remove_extent)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_EXTENT_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_pointer.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_pointer.h
index 50cde3829470..9042a5250055 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_pointer.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_pointer.h
@@ -1,32 +1,39 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_POINTER_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_POINTER_H
 
 #include <__config>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_pointer)
+template <class _Tp>
+struct remove_pointer {
+  using type _LIBCPP_NODEBUG = __remove_pointer(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer                      {typedef _LIBCPP_NODEBUG _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*>                {typedef _LIBCPP_NODEBUG _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const>          {typedef _LIBCPP_NODEBUG _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile>       {typedef _LIBCPP_NODEBUG _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG _Tp type;};
+#endif // __has_builtin(__remove_pointer)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_POINTER_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_reference.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_reference.h
index a69e48dc584b..7ea7fa52ecc5 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_reference.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_reference.h
@@ -1,31 +1,38 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_REFERENCE_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_REFERENCE_H
 
 #include <__config>
 #include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_reference)
+template <class _Tp>
+struct remove_reference {
+  using type _LIBCPP_NODEBUG = __remove_reference(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference        {typedef _LIBCPP_NODEBUG _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&>  {typedef _LIBCPP_NODEBUG _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG _Tp type;};
+#endif // __has_builtin(__remove_reference)
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_REFERENCE_H
diff --git a/contrib/llvm-project/libcxx/include/__type_traits/remove_volatile.h b/contrib/llvm-project/libcxx/include/__type_traits/remove_volatile.h
index 79f64c46a27d..8c7aa6744193 100644
--- a/contrib/llvm-project/libcxx/include/__type_traits/remove_volatile.h
+++ b/contrib/llvm-project/libcxx/include/__type_traits/remove_volatile.h
@@ -1,28 +1,36 @@
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___TYPE_TRAITS_REMOVE_VOLATILE_H
 #define _LIBCPP___TYPE_TRAITS_REMOVE_VOLATILE_H
 
 #include <__config>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if __has_builtin(__remove_volatile)
+template <class _Tp>
+struct remove_volatile {
+  using type _LIBCPP_NODEBUG = __remove_volatile(_Tp);
+};
+#else
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile               {typedef _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;};
+#endif // __has_builtin(__remove_volatile)
+
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_VOLATILE_H
diff --git a/contrib/llvm-project/libcxx/include/type_traits b/contrib/llvm-project/libcxx/include/type_traits
index 3a086c595f92..dc05f9a44daf 100644
--- a/contrib/llvm-project/libcxx/include/type_traits
+++ b/contrib/llvm-project/libcxx/include/type_traits
@@ -1,810 +1,810 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP_TYPE_TRAITS
 #define _LIBCPP_TYPE_TRAITS
 
 /*
     type_traits synopsis
 
 namespace std
 {
 
     // helper class:
     template <class T, T v> struct integral_constant;
     typedef integral_constant<bool, true>  true_type;   // C++11
     typedef integral_constant<bool, false> false_type;  // C++11
 
     template <bool B>                                   // C++14
     using bool_constant = integral_constant<bool, B>;   // C++14
     typedef bool_constant<true> true_type;              // C++14
     typedef bool_constant<false> false_type;            // C++14
 
     // helper traits
     template <bool, class T = void> struct enable_if;
     template <bool, class T, class F> struct conditional;
 
     // Primary classification traits:
     template <class T> struct is_void;
     template <class T> struct is_null_pointer;  // C++14
     template <class T> struct is_integral;
     template <class T> struct is_floating_point;
     template <class T> struct is_array;
     template <class T> struct is_pointer;
     template <class T> struct is_lvalue_reference;
     template <class T> struct is_rvalue_reference;
     template <class T> struct is_member_object_pointer;
     template <class T> struct is_member_function_pointer;
     template <class T> struct is_enum;
     template <class T> struct is_union;
     template <class T> struct is_class;
     template <class T> struct is_function;
 
     // Secondary classification traits:
     template <class T> struct is_reference;
     template <class T> struct is_arithmetic;
     template <class T> struct is_fundamental;
     template <class T> struct is_member_pointer;
     template <class T> struct is_scoped_enum; // C++2b
     template <class T> struct is_scalar;
     template <class T> struct is_object;
     template <class T> struct is_compound;
 
     // Const-volatile properties and transformations:
     template <class T> struct is_const;
     template <class T> struct is_volatile;
     template <class T> struct remove_const;
     template <class T> struct remove_volatile;
     template <class T> struct remove_cv;
     template <class T> struct add_const;
     template <class T> struct add_volatile;
     template <class T> struct add_cv;
 
     // Reference transformations:
     template <class T> struct remove_reference;
     template <class T> struct add_lvalue_reference;
     template <class T> struct add_rvalue_reference;
 
     // Pointer transformations:
     template <class T> struct remove_pointer;
     template <class T> struct add_pointer;
 
     template<class T> struct type_identity;                     // C++20
     template<class T>
       using type_identity_t = typename type_identity<T>::type;  // C++20
 
     // Integral properties:
     template <class T> struct is_signed;
     template <class T> struct is_unsigned;
     template <class T> struct make_signed;
     template <class T> struct make_unsigned;
 
     // Array properties and transformations:
     template <class T> struct rank;
     template <class T, unsigned I = 0> struct extent;
     template <class T> struct remove_extent;
     template <class T> struct remove_all_extents;
 
     template <class T> struct is_bounded_array;                 // C++20
     template <class T> struct is_unbounded_array;               // C++20
 
     // Member introspection:
     template <class T> struct is_pod;
     template <class T> struct is_trivial;
     template <class T> struct is_trivially_copyable;
     template <class T> struct is_standard_layout;
     template <class T> struct is_literal_type; // Deprecated in C++17; removed in C++20
     template <class T> struct is_empty;
     template <class T> struct is_polymorphic;
     template <class T> struct is_abstract;
     template <class T> struct is_final; // C++14
     template <class T> struct is_aggregate; // C++17
 
     template <class T, class... Args> struct is_constructible;
     template <class T>                struct is_default_constructible;
     template <class T>                struct is_copy_constructible;
     template <class T>                struct is_move_constructible;
     template <class T, class U>       struct is_assignable;
     template <class T>                struct is_copy_assignable;
     template <class T>                struct is_move_assignable;
     template <class T, class U>       struct is_swappable_with;       // C++17
     template <class T>                struct is_swappable;            // C++17
     template <class T>                struct is_destructible;
 
     template <class T, class... Args> struct is_trivially_constructible;
     template <class T>                struct is_trivially_default_constructible;
     template <class T>                struct is_trivially_copy_constructible;
     template <class T>                struct is_trivially_move_constructible;
     template <class T, class U>       struct is_trivially_assignable;
     template <class T>                struct is_trivially_copy_assignable;
     template <class T>                struct is_trivially_move_assignable;
     template <class T>                struct is_trivially_destructible;
 
     template <class T, class... Args> struct is_nothrow_constructible;
     template <class T>                struct is_nothrow_default_constructible;
     template <class T>                struct is_nothrow_copy_constructible;
     template <class T>                struct is_nothrow_move_constructible;
     template <class T, class U>       struct is_nothrow_assignable;
     template <class T>                struct is_nothrow_copy_assignable;
     template <class T>                struct is_nothrow_move_assignable;
     template <class T, class U>       struct is_nothrow_swappable_with; // C++17
     template <class T>                struct is_nothrow_swappable;      // C++17
     template <class T>                struct is_nothrow_destructible;
 
     template <class T> struct has_virtual_destructor;
 
     template<class T> struct has_unique_object_representations;         // C++17
 
     // Relationships between types:
     template <class T, class U> struct is_same;
     template <class Base, class Derived> struct is_base_of;
 
     template <class From, class To> struct is_convertible;
     template <typename From, typename To> struct is_nothrow_convertible;                  // C++20
     template <typename From, typename To> inline constexpr bool is_nothrow_convertible_v; // C++20
 
     template <class Fn, class... ArgTypes> struct is_invocable;
     template <class R, class Fn, class... ArgTypes> struct is_invocable_r;
 
     template <class Fn, class... ArgTypes> struct is_nothrow_invocable;
     template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r;
 
     // Alignment properties and transformations:
     template <class T> struct alignment_of;
     template <size_t Len, size_t Align = most_stringent_alignment_requirement>
         struct aligned_storage;
     template <size_t Len, class... Types> struct aligned_union;
     template <class T> struct remove_cvref; // C++20
 
     template <class T> struct decay;
     template <class... T> struct common_type;
     template <class T> struct underlying_type;
     template <class> class result_of; // undefined; deprecated in C++17; removed in C++20
     template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; // deprecated in C++17; removed in C++20
     template <class Fn, class... ArgTypes> struct invoke_result;  // C++17
 
     // const-volatile modifications:
     template <class T>
       using remove_const_t    = typename remove_const<T>::type;  // C++14
     template <class T>
       using remove_volatile_t = typename remove_volatile<T>::type;  // C++14
     template <class T>
       using remove_cv_t       = typename remove_cv<T>::type;  // C++14
     template <class T>
       using add_const_t       = typename add_const<T>::type;  // C++14
     template <class T>
       using add_volatile_t    = typename add_volatile<T>::type;  // C++14
     template <class T>
       using add_cv_t          = typename add_cv<T>::type;  // C++14
 
     // reference modifications:
     template <class T>
       using remove_reference_t     = typename remove_reference<T>::type;  // C++14
     template <class T>
       using add_lvalue_reference_t = typename add_lvalue_reference<T>::type;  // C++14
     template <class T>
       using add_rvalue_reference_t = typename add_rvalue_reference<T>::type;  // C++14
 
     // sign modifications:
     template <class T>
       using make_signed_t   = typename make_signed<T>::type;  // C++14
     template <class T>
       using make_unsigned_t = typename make_unsigned<T>::type;  // C++14
 
     // array modifications:
     template <class T>
       using remove_extent_t      = typename remove_extent<T>::type;  // C++14
     template <class T>
       using remove_all_extents_t = typename remove_all_extents<T>::type;  // C++14
 
     template <class T>
       inline constexpr bool is_bounded_array_v
         = is_bounded_array<T>::value;                                     // C++20
       inline constexpr bool is_unbounded_array_v
         = is_unbounded_array<T>::value;                                   // C++20
 
     // pointer modifications:
     template <class T>
       using remove_pointer_t = typename remove_pointer<T>::type;  // C++14
     template <class T>
       using add_pointer_t    = typename add_pointer<T>::type;  // C++14
 
     // other transformations:
     template <size_t Len, size_t Align=default-alignment>
       using aligned_storage_t = typename aligned_storage<Len,Align>::type;  // C++14
     template <size_t Len, class... Types>
       using aligned_union_t   = typename aligned_union<Len,Types...>::type;  // C++14
     template <class T>
       using remove_cvref_t    = typename remove_cvref<T>::type;  // C++20
     template <class T>
       using decay_t           = typename decay<T>::type;  // C++14
     template <bool b, class T=void>
       using enable_if_t       = typename enable_if<b,T>::type;  // C++14
     template <bool b, class T, class F>
       using conditional_t     = typename conditional<b,T,F>::type;  // C++14
     template <class... T>
       using common_type_t     = typename common_type<T...>::type;  // C++14
     template <class T>
       using underlying_type_t = typename underlying_type<T>::type;  // C++14
     template <class T>
       using result_of_t       = typename result_of<T>::type;  // C++14; deprecated in C++17; removed in C++20
     template <class Fn, class... ArgTypes>
       using invoke_result_t   = typename invoke_result<Fn, ArgTypes...>::type;  // C++17
 
     template <class...>
       using void_t = void;   // C++17
 
       // See C++14 20.10.4.1, primary type categories
       template <class T> inline constexpr bool is_void_v
         = is_void<T>::value;                                             // C++17
       template <class T> inline constexpr bool is_null_pointer_v
         = is_null_pointer<T>::value;                                     // C++17
       template <class T> inline constexpr bool is_integral_v
         = is_integral<T>::value;                                         // C++17
       template <class T> inline constexpr bool is_floating_point_v
         = is_floating_point<T>::value;                                   // C++17
       template <class T> inline constexpr bool is_array_v
         = is_array<T>::value;                                            // C++17
       template <class T> inline constexpr bool is_pointer_v
         = is_pointer<T>::value;                                          // C++17
       template <class T> inline constexpr bool is_lvalue_reference_v
         = is_lvalue_reference<T>::value;                                 // C++17
       template <class T> inline constexpr bool is_rvalue_reference_v
         = is_rvalue_reference<T>::value;                                 // C++17
       template <class T> inline constexpr bool is_member_object_pointer_v
         = is_member_object_pointer<T>::value;                            // C++17
       template <class T> inline constexpr bool is_member_function_pointer_v
         = is_member_function_pointer<T>::value;                          // C++17
       template <class T> inline constexpr bool is_enum_v
         = is_enum<T>::value;                                             // C++17
       template <class T> inline constexpr bool is_union_v
         = is_union<T>::value;                                            // C++17
       template <class T> inline constexpr bool is_class_v
         = is_class<T>::value;                                            // C++17
       template <class T> inline constexpr bool is_function_v
         = is_function<T>::value;                                         // C++17
 
       // See C++14 20.10.4.2, composite type categories
       template <class T> inline constexpr bool is_reference_v
         = is_reference<T>::value;                                        // C++17
       template <class T> inline constexpr bool is_arithmetic_v
         = is_arithmetic<T>::value;                                       // C++17
       template <class T> inline constexpr bool is_fundamental_v
         = is_fundamental<T>::value;                                      // C++17
       template <class T> inline constexpr bool is_object_v
         = is_object<T>::value;                                           // C++17
       template <class T> inline constexpr bool is_scalar_v
         = is_scalar<T>::value;                                           // C++17
       template <class T> inline constexpr bool is_compound_v
         = is_compound<T>::value;                                         // C++17
       template <class T> inline constexpr bool is_member_pointer_v
         = is_member_pointer<T>::value;                                   // C++17
       template <class T> inline constexpr bool is_scoped_enum_v
         = is_scoped_enum<T>::value;                                      // C++2b
 
       // See C++14 20.10.4.3, type properties
       template <class T> inline constexpr bool is_const_v
         = is_const<T>::value;                                            // C++17
       template <class T> inline constexpr bool is_volatile_v
         = is_volatile<T>::value;                                         // C++17
       template <class T> inline constexpr bool is_trivial_v
         = is_trivial<T>::value;                                          // C++17
       template <class T> inline constexpr bool is_trivially_copyable_v
         = is_trivially_copyable<T>::value;                               // C++17
       template <class T> inline constexpr bool is_standard_layout_v
         = is_standard_layout<T>::value;                                  // C++17
       template <class T> inline constexpr bool is_pod_v
         = is_pod<T>::value;                                              // C++17
       template <class T> inline constexpr bool is_literal_type_v
         = is_literal_type<T>::value;                                     // C++17; deprecated in C++17; removed in C++20
       template <class T> inline constexpr bool is_empty_v
         = is_empty<T>::value;                                            // C++17
       template <class T> inline constexpr bool is_polymorphic_v
         = is_polymorphic<T>::value;                                      // C++17
       template <class T> inline constexpr bool is_abstract_v
         = is_abstract<T>::value;                                         // C++17
       template <class T> inline constexpr bool is_final_v
         = is_final<T>::value;                                            // C++17
       template <class T> inline constexpr bool is_aggregate_v
         = is_aggregate<T>::value;                                        // C++17
       template <class T> inline constexpr bool is_signed_v
         = is_signed<T>::value;                                           // C++17
       template <class T> inline constexpr bool is_unsigned_v
         = is_unsigned<T>::value;                                         // C++17
       template <class T, class... Args> inline constexpr bool is_constructible_v
         = is_constructible<T, Args...>::value;                           // C++17
       template <class T> inline constexpr bool is_default_constructible_v
         = is_default_constructible<T>::value;                            // C++17
       template <class T> inline constexpr bool is_copy_constructible_v
         = is_copy_constructible<T>::value;                               // C++17
       template <class T> inline constexpr bool is_move_constructible_v
         = is_move_constructible<T>::value;                               // C++17
       template <class T, class U> inline constexpr bool is_assignable_v
         = is_assignable<T, U>::value;                                    // C++17
       template <class T> inline constexpr bool is_copy_assignable_v
         = is_copy_assignable<T>::value;                                  // C++17
       template <class T> inline constexpr bool is_move_assignable_v
         = is_move_assignable<T>::value;                                  // C++17
       template <class T, class U> inline constexpr bool is_swappable_with_v
         = is_swappable_with<T, U>::value;                                // C++17
       template <class T> inline constexpr bool is_swappable_v
         = is_swappable<T>::value;                                        // C++17
       template <class T> inline constexpr bool is_destructible_v
         = is_destructible<T>::value;                                     // C++17
       template <class T, class... Args> inline constexpr bool is_trivially_constructible_v
         = is_trivially_constructible<T, Args...>::value;                 // C++17
       template <class T> inline constexpr bool is_trivially_default_constructible_v
         = is_trivially_default_constructible<T>::value;                  // C++17
       template <class T> inline constexpr bool is_trivially_copy_constructible_v
         = is_trivially_copy_constructible<T>::value;                     // C++17
       template <class T> inline constexpr bool is_trivially_move_constructible_v
         = is_trivially_move_constructible<T>::value;                     // C++17
       template <class T, class U> inline constexpr bool is_trivially_assignable_v
         = is_trivially_assignable<T, U>::value;                          // C++17
       template <class T> inline constexpr bool is_trivially_copy_assignable_v
         = is_trivially_copy_assignable<T>::value;                        // C++17
       template <class T> inline constexpr bool is_trivially_move_assignable_v
         = is_trivially_move_assignable<T>::value;                        // C++17
       template <class T> inline constexpr bool is_trivially_destructible_v
         = is_trivially_destructible<T>::value;                           // C++17
       template <class T, class... Args> inline constexpr bool is_nothrow_constructible_v
         = is_nothrow_constructible<T, Args...>::value;                   // C++17
       template <class T> inline constexpr bool is_nothrow_default_constructible_v
         = is_nothrow_default_constructible<T>::value;                    // C++17
       template <class T> inline constexpr bool is_nothrow_copy_constructible_v
         = is_nothrow_copy_constructible<T>::value;                       // C++17
       template <class T> inline constexpr bool is_nothrow_move_constructible_v
         = is_nothrow_move_constructible<T>::value;                       // C++17
       template <class T, class U> inline constexpr bool is_nothrow_assignable_v
         = is_nothrow_assignable<T, U>::value;                            // C++17
       template <class T> inline constexpr bool is_nothrow_copy_assignable_v
         = is_nothrow_copy_assignable<T>::value;                          // C++17
       template <class T> inline constexpr bool is_nothrow_move_assignable_v
         = is_nothrow_move_assignable<T>::value;                          // C++17
       template <class T, class U> inline constexpr bool is_nothrow_swappable_with_v
         = is_nothrow_swappable_with<T, U>::value;                       // C++17
       template <class T> inline constexpr bool is_nothrow_swappable_v
         = is_nothrow_swappable<T>::value;                               // C++17
       template <class T> inline constexpr bool is_nothrow_destructible_v
         = is_nothrow_destructible<T>::value;                             // C++17
       template <class T> inline constexpr bool has_virtual_destructor_v
         = has_virtual_destructor<T>::value;                              // C++17
       template<class T> inline constexpr bool has_unique_object_representations_v // C++17
         = has_unique_object_representations<T>::value;
 
       // See C++14 20.10.5, type property queries
       template <class T> inline constexpr size_t alignment_of_v
         = alignment_of<T>::value;                                        // C++17
       template <class T> inline constexpr size_t rank_v
         = rank<T>::value;                                                // C++17
       template <class T, unsigned I = 0> inline constexpr size_t extent_v
         = extent<T, I>::value;                                           // C++17
 
       // See C++14 20.10.6, type relations
       template <class T, class U> inline constexpr bool is_same_v
         = is_same<T, U>::value;                                          // C++17
       template <class Base, class Derived> inline constexpr bool is_base_of_v
         = is_base_of<Base, Derived>::value;                              // C++17
       template <class From, class To> inline constexpr bool is_convertible_v
         = is_convertible<From, To>::value;                               // C++17
       template <class Fn, class... ArgTypes> inline constexpr bool is_invocable_v
         = is_invocable<Fn, ArgTypes...>::value;                          // C++17
       template <class R, class Fn, class... ArgTypes> inline constexpr bool is_invocable_r_v
         = is_invocable_r<R, Fn, ArgTypes...>::value;                     // C++17
       template <class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_v
         = is_nothrow_invocable<Fn, ArgTypes...>::value;                  // C++17
       template <class R, class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_r_v
         = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value;             // C++17
 
       // [meta.logical], logical operator traits:
       template<class... B> struct conjunction;                           // C++17
       template<class... B>
         inline constexpr bool conjunction_v = conjunction<B...>::value;  // C++17
       template<class... B> struct disjunction;                           // C++17
       template<class... B>
         inline constexpr bool disjunction_v = disjunction<B...>::value;  // C++17
       template<class B> struct negation;                                 // C++17
       template<class B>
         inline constexpr bool negation_v = negation<B>::value;           // C++17
 
 }
 
 */
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__functional/invoke.h>
 #include <__type_traits/add_const.h>
 #include <__type_traits/add_cv.h>
 #include <__type_traits/add_lvalue_reference.h>
 #include <__type_traits/add_pointer.h>
 #include <__type_traits/add_rvalue_reference.h>
 #include <__type_traits/add_volatile.h>
 #include <__type_traits/aligned_storage.h>
 #include <__type_traits/aligned_union.h>
 #include <__type_traits/alignment_of.h>
 #include <__type_traits/apply_cv.h>
 #include <__type_traits/common_reference.h>
 #include <__type_traits/common_type.h>
 #include <__type_traits/conditional.h>
 #include <__type_traits/conjunction.h>
 #include <__type_traits/decay.h>
 #include <__type_traits/disjunction.h>
 #include <__type_traits/enable_if.h>
 #include <__type_traits/extent.h>
 #include <__type_traits/has_unique_object_representation.h>
 #include <__type_traits/has_virtual_destructor.h>
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/is_abstract.h>
 #include <__type_traits/is_aggregate.h>
 #include <__type_traits/is_arithmetic.h>
 #include <__type_traits/is_array.h>
 #include <__type_traits/is_assignable.h>
 #include <__type_traits/is_base_of.h>
 #include <__type_traits/is_bounded_array.h>
 #include <__type_traits/is_callable.h>
 #include <__type_traits/is_class.h>
 #include <__type_traits/is_compound.h>
 #include <__type_traits/is_const.h>
 #include <__type_traits/is_constant_evaluated.h>
 #include <__type_traits/is_constructible.h>
 #include <__type_traits/is_convertible.h>
 #include <__type_traits/is_copy_assignable.h>
 #include <__type_traits/is_copy_constructible.h>
 #include <__type_traits/is_default_constructible.h>
 #include <__type_traits/is_destructible.h>
 #include <__type_traits/is_empty.h>
 #include <__type_traits/is_enum.h>
 #include <__type_traits/is_final.h>
 #include <__type_traits/is_floating_point.h>
 #include <__type_traits/is_function.h>
 #include <__type_traits/is_fundamental.h>
 #include <__type_traits/is_integral.h>
 #include <__type_traits/is_literal_type.h>
 #include <__type_traits/is_member_function_pointer.h>
 #include <__type_traits/is_member_object_pointer.h>
 #include <__type_traits/is_member_pointer.h>
 #include <__type_traits/is_move_assignable.h>
 #include <__type_traits/is_move_constructible.h>
 #include <__type_traits/is_nothrow_assignable.h>
 #include <__type_traits/is_nothrow_constructible.h>
 #include <__type_traits/is_nothrow_convertible.h>
 #include <__type_traits/is_nothrow_copy_assignable.h>
 #include <__type_traits/is_nothrow_copy_constructible.h>
 #include <__type_traits/is_nothrow_default_constructible.h>
 #include <__type_traits/is_nothrow_destructible.h>
 #include <__type_traits/is_nothrow_move_assignable.h>
 #include <__type_traits/is_nothrow_move_constructible.h>
 #include <__type_traits/is_null_pointer.h>
 #include <__type_traits/is_object.h>
 #include <__type_traits/is_pod.h>
 #include <__type_traits/is_pointer.h>
 #include <__type_traits/is_polymorphic.h>
 #include <__type_traits/is_reference.h>
 #include <__type_traits/is_reference_wrapper.h>
 #include <__type_traits/is_referenceable.h>
 #include <__type_traits/is_same.h>
 #include <__type_traits/is_scalar.h>
 #include <__type_traits/is_scoped_enum.h>
 #include <__type_traits/is_signed.h>
 #include <__type_traits/is_standard_layout.h>
 #include <__type_traits/is_trivial.h>
 #include <__type_traits/is_trivially_assignable.h>
 #include <__type_traits/is_trivially_constructible.h>
 #include <__type_traits/is_trivially_copy_assignable.h>
 #include <__type_traits/is_trivially_copy_constructible.h>
 #include <__type_traits/is_trivially_copyable.h>
 #include <__type_traits/is_trivially_default_constructible.h>
 #include <__type_traits/is_trivially_destructible.h>
 #include <__type_traits/is_trivially_move_assignable.h>
 #include <__type_traits/is_trivially_move_constructible.h>
 #include <__type_traits/is_unbounded_array.h>
 #include <__type_traits/is_union.h>
 #include <__type_traits/is_unsigned.h>
 #include <__type_traits/is_void.h>
 #include <__type_traits/is_volatile.h>
 #include <__type_traits/make_signed.h>
 #include <__type_traits/make_unsigned.h>
 #include <__type_traits/negation.h>
 #include <__type_traits/rank.h>
 #include <__type_traits/remove_all_extents.h>
 #include <__type_traits/remove_const.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/remove_extent.h>
 #include <__type_traits/remove_pointer.h>
 #include <__type_traits/remove_reference.h>
 #include <__type_traits/remove_volatile.h>
 #include <__type_traits/type_identity.h>
 #include <__type_traits/underlying_type.h>
 #include <__type_traits/void_t.h>
 #include <__utility/declval.h>
 #include <cstddef>
 #include <cstdint>
 #include <version>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair;
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash;
 
 // Member detector base
 
 template <class _Tp, bool>
 struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {};
 
 // is_integral
 
 template <class _Tp>
 struct __unconstref {
     typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type;
 };
 
 #ifndef _LIBCPP_CXX03_LANG
 // First of all, we can't implement this check in C++03 mode because the {}
 // default initialization syntax isn't valid.
 // Second, we implement the trait in a funny manner with two defaulted template
 // arguments to workaround Clang's PR43454.
 template <class _Tp>
 void __test_implicit_default_constructible(_Tp);
 
 template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type>
 struct __is_implicitly_default_constructible
     : false_type
 { };
 
 template <class _Tp>
 struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type>
     : true_type
 { };
 
 template <class _Tp>
 struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type>
     : false_type
 { };
 #endif // !C++03
 
 // result_of
 
 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS)
 template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of;
 
 template <class _Fp, class ..._Args>
 class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)>
     : public __invoke_of<_Fp, _Args...>
 {
 };
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type;
 #endif // _LIBCPP_STD_VER > 11
 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS)
 
 // __swappable
 
 template <class _Tp> struct __is_swappable;
 template <class _Tp> struct __is_nothrow_swappable;
 
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Tp>
 using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type;
 #else
 template <class>
 using __swap_result_t = void;
 #endif
 
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp>
 swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
                                     is_nothrow_move_assignable<_Tp>::value);
 
 template<class _Tp, size_t _Np>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
 typename enable_if<
     __is_swappable<_Tp>::value
 >::type
 swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value);
 
 namespace __detail
 {
 // ALL generic swap overloads MUST already have a declaration available at this point.
 
 template <class _Tp, class _Up = _Tp,
           bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value>
 struct __swappable_with
 {
     template <class _LHS, class _RHS>
     static decltype(swap(declval<_LHS>(), declval<_RHS>()))
     __test_swap(int);
     template <class, class>
     static __nat __test_swap(long);
 
     // Extra parens are needed for the C++03 definition of decltype.
     typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1;
     typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2;
 
     static const bool value = _IsNotSame<__swap1, __nat>::value
                            && _IsNotSame<__swap2, __nat>::value;
 };
 
 template <class _Tp, class _Up>
 struct __swappable_with<_Tp, _Up,  false> : false_type {};
 
 template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value>
 struct __nothrow_swappable_with {
   static const bool value =
 #ifndef _LIBCPP_HAS_NO_NOEXCEPT
       noexcept(swap(declval<_Tp>(), declval<_Up>()))
   &&  noexcept(swap(declval<_Up>(), declval<_Tp>()));
 #else
       false;
 #endif
 };
 
 template <class _Tp, class _Up>
 struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {};
 
 } // namespace __detail
 
 template <class _Tp>
 struct __is_swappable
     : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value>
 {
 };
 
 template <class _Tp>
 struct __is_nothrow_swappable
     : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value>
 {
 };
 
 #if _LIBCPP_STD_VER > 14
 
 template <class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS is_swappable_with
     : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value>
 {
 };
 
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_swappable
     : public conditional<
-        __is_referenceable<_Tp>::value,
+        __libcpp_is_referenceable<_Tp>::value,
         is_swappable_with<
             typename add_lvalue_reference<_Tp>::type,
             typename add_lvalue_reference<_Tp>::type>,
         false_type
     >::type
 {
 };
 
 template <class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with
     : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value>
 {
 };
 
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable
     : public conditional<
-        __is_referenceable<_Tp>::value,
+        __libcpp_is_referenceable<_Tp>::value,
         is_nothrow_swappable_with<
             typename add_lvalue_reference<_Tp>::type,
             typename add_lvalue_reference<_Tp>::type>,
         false_type
     >::type
 {
 };
 
 template <class _Tp, class _Up>
 inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value;
 
 template <class _Tp>
 inline constexpr bool is_swappable_v = is_swappable<_Tp>::value;
 
 template <class _Tp, class _Up>
 inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value;
 
 template <class _Tp>
 inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value;
 
 #endif // _LIBCPP_STD_VER > 14
 
 template <class _Tp, bool = is_enum<_Tp>::value>
 struct __sfinae_underlying_type
 {
     typedef typename underlying_type<_Tp>::type type;
     typedef decltype(((type)1) + 0) __promoted_type;
 };
 
 template <class _Tp>
 struct __sfinae_underlying_type<_Tp, false> {};
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 int __convert_to_integral(int __val) { return __val; }
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 unsigned __convert_to_integral(unsigned __val) { return __val; }
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 long __convert_to_integral(long __val) { return __val; }
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 unsigned long __convert_to_integral(unsigned long __val) { return __val; }
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 long long __convert_to_integral(long long __val) { return __val; }
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 unsigned long long __convert_to_integral(unsigned long long __val) {return __val; }
 
 template<typename _Fp>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 typename enable_if<is_floating_point<_Fp>::value, long long>::type
  __convert_to_integral(_Fp __val) { return __val; }
 
 #ifndef _LIBCPP_HAS_NO_INT128
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 __int128_t __convert_to_integral(__int128_t __val) { return __val; }
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 __uint128_t __convert_to_integral(__uint128_t __val) { return __val; }
 #endif
 
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 typename __sfinae_underlying_type<_Tp>::__promoted_type
 __convert_to_integral(_Tp __val) { return __val; }
 
 // These traits are used in __tree and __hash_table
 struct __extract_key_fail_tag {};
 struct __extract_key_self_tag {};
 struct __extract_key_first_tag {};
 
 template <class _ValTy, class _Key,
           class _RawValTy = typename __unconstref<_ValTy>::type>
 struct __can_extract_key
     : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag,
                   __extract_key_fail_tag>::type {};
 
 template <class _Pair, class _Key, class _First, class _Second>
 struct __can_extract_key<_Pair, _Key, pair<_First, _Second> >
     : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value,
                   __extract_key_first_tag, __extract_key_fail_tag>::type {};
 
 // __can_extract_map_key uses true_type/false_type instead of the tags.
 // It returns true if _Key != _ContainerValueTy (the container is a map not a set)
 // and _ValTy == _Key.
 template <class _ValTy, class _Key, class _ContainerValueTy,
           class _RawValTy = typename __unconstref<_ValTy>::type>
 struct __can_extract_map_key
     : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {};
 
 // This specialization returns __extract_key_fail_tag for non-map containers
 // because _Key == _ContainerValueTy
 template <class _ValTy, class _Key, class _RawValTy>
 struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy>
     : false_type {};
 
 template <class _CharT>
 using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >;
 
 template<class _Tp>
 using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&;
 
 template<bool _Const, class _Tp>
 using __maybe_const = typename conditional<_Const, const _Tp, _Tp>::type;
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP_TYPE_TRAITS