33#if __cplusplus > 201703L
37namespace std _GLIBCXX_VISIBILITY(default)
39_GLIBCXX_BEGIN_NAMESPACE_VERSION
41 struct __is_transparent;
49 template<
typename _Tp>
51 operator()(_Tp&& __t)
const noexcept
54 using is_transparent = __is_transparent;
57#ifdef __cpp_lib_concepts
59#define __cpp_lib_ranges 201911L
68 template<
typename _Tp,
typename _Up>
69 concept __less_builtin_ptr_cmp
70 =
requires (_Tp&& __t, _Up&& __u) { { __t < __u } -> same_as<bool>; }
71 && convertible_to<_Tp, const volatile void*>
72 && convertible_to<_Up, const volatile void*>
73 && (!
requires(_Tp&& __t, _Up&& __u)
75 && !
requires(_Tp&& __t, _Up&& __u)
87 template<
typename _Tp,
typename _Up>
88 requires equality_comparable_with<_Tp, _Up>
90 operator()(_Tp&& __t, _Up&& __u)
const
94 using is_transparent = __is_transparent;
100 template<
typename _Tp,
typename _Up>
101 requires equality_comparable_with<_Tp, _Up>
103 operator()(_Tp&& __t, _Up&& __u)
const
107 using is_transparent = __is_transparent;
113 template<
typename _Tp,
typename _Up>
114 requires totally_ordered_with<_Tp, _Up>
116 operator()(_Tp&& __t, _Up&& __u)
const
119 if constexpr (__detail::__less_builtin_ptr_cmp<_Tp, _Up>)
121#ifdef __cpp_lib_is_constant_evaluated
125 auto __x =
reinterpret_cast<__UINTPTR_TYPE__
>(
127 auto __y =
reinterpret_cast<__UINTPTR_TYPE__
>(
135 using is_transparent = __is_transparent;
141 template<
typename _Tp,
typename _Up>
142 requires totally_ordered_with<_Tp, _Up>
144 operator()(_Tp&& __t, _Up&& __u)
const
148 using is_transparent = __is_transparent;
154 template<
typename _Tp,
typename _Up>
155 requires totally_ordered_with<_Tp, _Up>
157 operator()(_Tp&& __t, _Up&& __u)
const
161 using is_transparent = __is_transparent;
167 template<
typename _Tp,
typename _Up>
168 requires totally_ordered_with<_Tp, _Up>
170 operator()(_Tp&& __t, _Up&& __u)
const
174 using is_transparent = __is_transparent;
179_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.