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// -*- C++ -*-
//===------------------------ type_traits ---------------------------------===//
//
// 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 <__config>
#include <cstddef>
#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> class _LIBCPP_TEMPLATE_VIS reference_wrapper;
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash;
template <class _Tp, _Tp __v>
struct _LIBCPP_TEMPLATE_VIS integral_constant
{
static _LIBCPP_CONSTEXPR const _Tp value = __v;
typedef _Tp value_type;
typedef integral_constant type;
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;}
#if _LIBCPP_STD_VER > 11
_LIBCPP_INLINE_VISIBILITY
constexpr value_type operator ()() const _NOEXCEPT {return value;}
#endif
};
template <class _Tp, _Tp __v>
_LIBCPP_CONSTEXPR const _Tp integral_constant<_Tp, __v>::value;
#if _LIBCPP_STD_VER > 14
template <bool __b>
using bool_constant = integral_constant<bool, __b>;
#define _LIBCPP_BOOL_CONSTANT(__b) bool_constant<(__b)>
#else
#define _LIBCPP_BOOL_CONSTANT(__b) integral_constant<bool,(__b)>
#endif
template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;};
template <bool _Bp, class _Tp = void> using __enable_if_t _LIBCPP_NODEBUG = typename enable_if<_Bp, _Tp>::type;
#if _LIBCPP_STD_VER > 11
template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type;
#endif
typedef _LIBCPP_BOOL_CONSTANT(true) true_type;
typedef _LIBCPP_BOOL_CONSTANT(false) false_type;
template <bool _Val>
using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>;
template <bool> struct _MetaBase;
template <>
struct _MetaBase<true> {
template <class _Tp, class _Up>
using _SelectImpl _LIBCPP_NODEBUG = _Tp;
template <template <class...> class _FirstFn, template <class...> class, class ..._Args>
using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>;
template <class _First, class...>
using _FirstImpl _LIBCPP_NODEBUG = _First;
template <class, class _Second, class...>
using _SecondImpl _LIBCPP_NODEBUG = _Second;
template <class _Result, class _First, class ..._Rest>
using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>;
};
template <>
struct _MetaBase<false> {
template <class _Tp, class _Up>
using _SelectImpl _LIBCPP_NODEBUG = _Up;
template <template <class...> class, template <class...> class _SecondFn, class ..._Args>
using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>;
template <class _Result, class ...>
using _OrImpl _LIBCPP_NODEBUG = _Result;
};
template <bool _Cond, class _IfRes, class _ElseRes>
using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>;
template <class ..._Rest>
using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>;
template <class _Pred>
struct _Not : _BoolConstant<!_Pred::value> {};
template <class ..._Args>
using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>;
template <class ..._Args>
using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>;
template <class ...> using __expand_to_true = true_type;
template <class ..._Pred>
__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int);
template <class ...>
false_type __and_helper(...);
template <class ..._Pred>
using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0));
template <template <class...> class _Func, class ..._Args>
struct _Lazy : _Func<_Args...> {};
// Member detector base
template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> >
true_type __sfinae_test_impl(int);
template <template <class...> class, class ...>
false_type __sfinae_test_impl(...);
template <template <class ...> class _Templ, class ..._Args>
using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0));
template <class>
struct __void_t { typedef void type; };
template <class _Tp>
struct __identity { typedef _Tp type; };
template <class _Tp>
using __identity_t _LIBCPP_NODEBUG = typename __identity<_Tp>::type;
template <class _Tp, bool>
struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {};
template <bool _Bp, class _If, class _Then>
struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;};
template <class _If, class _Then>
struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;};
#if _LIBCPP_STD_VER > 11
template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type;
#endif
// is_same
#if __has_keyword(__is_same)
template <class _Tp, class _Up>
struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp, class _Up>
inline constexpr bool is_same_v = __is_same(_Tp, _Up);
#endif
#else
template <class _Tp, class _Up> struct _LIBCPP_TEMPLATE_VIS is_same : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp, class _Up>
inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
#endif
#endif // __is_same
template <class _Tp, class _Up>
using _IsSame = _BoolConstant<
#ifdef __clang__
__is_same(_Tp, _Up)
#else
is_same<_Tp, _Up>::value
#endif
>;
template <class _Tp, class _Up>
using _IsNotSame = _BoolConstant<
#ifdef __clang__
!__is_same(_Tp, _Up)
#else
!is_same<_Tp, _Up>::value
#endif
>;
template <class _Tp>
using __test_for_primary_template = __enable_if_t<
_IsSame<_Tp, typename _Tp::__primary_template>::value
>;
template <class _Tp>
using __is_primary_template = _IsValidExpansion<
__test_for_primary_template, _Tp
>;
struct __two {char __lx[2];};
// helper class:
// is_const
#if __has_keyword(__is_const)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_const_v = __is_const(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_const_v = is_const<_Tp>::value;
#endif
#endif // __has_keyword(__is_const)
// is_volatile
#if __has_keyword(__is_volatile)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_volatile_v = __is_volatile(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
#endif
#endif // __has_keyword(__is_volatile)
// remove_const
#if __has_keyword(__remove_const)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS remove_const {typedef __remove_const(_Tp) type;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_const_t = __remove_const(_Tp);
#endif
#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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type;
#endif
#endif // __has_keyword(__remove_const)
// remove_volatile
#if __has_keyword(__remove_volatile)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef __remove_volatile(_Tp) type;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_volatile_t = __remove_volatile(_Tp);
#endif
#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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type;
#endif
#endif // __has_keyword(__remove_volatile)
// remove_cv
#if __has_keyword(__remove_cv)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS remove_cv {typedef __remove_cv(_Tp) type;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_cv_t = __remove_cv(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv
{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type;
#endif
#endif // __has_keyword(__remove_cv)
// is_void
#if __has_keyword(__is_void)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_void_v = __is_void(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void
: public is_same<typename remove_cv<_Tp>::type, void> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_void_v = is_void<_Tp>::value;
#endif
#endif // __has_keyword(__is_void)
// __is_nullptr_t
template <class _Tp> struct __is_nullptr_t_impl : public false_type {};
template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t
: public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {};
#if _LIBCPP_STD_VER > 11
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer
: public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
#endif
#endif // _LIBCPP_STD_VER > 11
// is_integral
#if __has_keyword(__is_integral)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_integral_v = __is_integral(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral
: public _BoolConstant<__libcpp_is_integral<typename remove_cv<_Tp>::type>::value> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_integral_v = is_integral<_Tp>::value;
#endif
#endif // __has_keyword(__is_integral)
// [basic.fundamental] defines five standard signed integer types;
// __int128_t is an extended signed integer type.
// The signed and unsigned integer types, plus bool and the
// five types with "char" in their name, compose the "integral" types.
template <class _Tp> struct __libcpp_is_signed_integer : public false_type {};
template <> struct __libcpp_is_signed_integer<signed char> : public true_type {};
template <> struct __libcpp_is_signed_integer<signed short> : public true_type {};
template <> struct __libcpp_is_signed_integer<signed int> : public true_type {};
template <> struct __libcpp_is_signed_integer<signed long> : public true_type {};
template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {};
#ifndef _LIBCPP_HAS_NO_INT128
template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {};
#endif
template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {};
template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {};
template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {};
template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {};
template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {};
template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {};
#ifndef _LIBCPP_HAS_NO_INT128
template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {};
#endif
// is_floating_point
// <concepts> implements __libcpp_floating_point
template <class _Tp> struct __libcpp_is_floating_point : public false_type {};
template <> struct __libcpp_is_floating_point<float> : public true_type {};
template <> struct __libcpp_is_floating_point<double> : public true_type {};
template <> struct __libcpp_is_floating_point<long double> : public true_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point
: public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
#endif
// is_array
#if __has_keyword(__is_array)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_array_v = __is_array(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array
: public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]>
: public true_type {};
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]>
: public true_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_array_v = is_array<_Tp>::value;
#endif
#endif // __has_keyword(__is_array)
// is_pointer
// Before Clang 11 / AppleClang 12.0.5, __is_pointer didn't work for Objective-C types.
#if __has_keyword(__is_pointer) && \
!(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1100) && \
!(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER < 1205)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_pointer_v = __is_pointer(_Tp);
#endif
#else // __has_keyword(__is_pointer)
template <class _Tp> struct __libcpp_is_pointer : public false_type {};
template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {};
template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; };
#if defined(_LIBCPP_HAS_OBJC_ARC)
template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; };
template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; };
template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; };
template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; };
#endif
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer
: public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
#endif
#endif // __has_keyword(__is_pointer)
// is_reference
#if __has_keyword(__is_lvalue_reference) && \
__has_keyword(__is_rvalue_reference) && \
__has_keyword(__is_reference)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { };
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { };
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_reference_v = __is_reference(_Tp);
template <class _Tp>
inline constexpr bool is_lvalue_reference_v = __is_lvalue_reference(_Tp);
template <class _Tp>
inline constexpr bool is_rvalue_reference_v = __is_rvalue_reference(_Tp);
#endif
#else // __has_keyword(__is_lvalue_reference) && etc...
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_reference_v = is_reference<_Tp>::value;
template <class _Tp>
inline constexpr bool is_lvalue_reference_v = is_lvalue_reference<_Tp>::value;
template <class _Tp>
inline constexpr bool is_rvalue_reference_v = is_rvalue_reference<_Tp>::value;
#endif
#endif // __has_keyword(__is_lvalue_reference) && etc...
// is_union
#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union
: public integral_constant<bool, __is_union(_Tp)> {};
#else
template <class _Tp> struct __libcpp_union : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union
: public __libcpp_union<typename remove_cv<_Tp>::type> {};
#endif
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_union_v = is_union<_Tp>::value;
#endif
// is_class
#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class
: public integral_constant<bool, __is_class(_Tp)> {};
#else
namespace __is_class_imp
{
template <class _Tp> char __test(int _Tp::*);
template <class _Tp> __two __test(...);
}
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class
: public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {};
#endif
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_class_v = is_class<_Tp>::value;
#endif
// is_function
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function
: public _BoolConstant<
#ifdef __clang__
__is_function(_Tp)
#else
!(is_reference<_Tp>::value || is_const<const _Tp>::value)
#endif
> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_function_v = is_function<_Tp>::value;
#endif
template <class _Tp> struct __libcpp_is_member_pointer {
enum {
__is_member = false,
__is_func = false,
__is_obj = false
};
};
template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> {
enum {
__is_member = true,
__is_func = is_function<_Tp>::value,
__is_obj = !__is_func,
};
};
#if __has_keyword(__is_member_function_pointer)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
: _BoolConstant<__is_member_function_pointer(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_member_function_pointer_v = __is_member_function_pointer(_Tp);
#endif
#else // __has_keyword(__is_member_function_pointer)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
: public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value;
#endif
#endif // __has_keyword(__is_member_function_pointer)
// is_member_pointer
#if __has_keyword(__is_member_pointer)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp);
#endif
#else // __has_keyword(__is_member_pointer)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer
: public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
#endif
#endif // __has_keyword(__is_member_pointer)
// is_member_object_pointer
#if __has_keyword(__is_member_object_pointer)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer
: _BoolConstant<__is_member_object_pointer(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_member_object_pointer_v = __is_member_object_pointer(_Tp);
#endif
#else // __has_keyword(__is_member_object_pointer)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer
: public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<_Tp>::value;
#endif
#endif // __has_keyword(__is_member_object_pointer)
// is_enum
#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum
: public integral_constant<bool, __is_enum(_Tp)> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_enum_v = __is_enum(_Tp);
#endif
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum
: public integral_constant<bool, !is_void<_Tp>::value &&
!is_integral<_Tp>::value &&
!is_floating_point<_Tp>::value &&
!is_array<_Tp>::value &&
!is_pointer<_Tp>::value &&
!is_reference<_Tp>::value &&
!is_member_pointer<_Tp>::value &&
!is_union<_Tp>::value &&
!is_class<_Tp>::value &&
!is_function<_Tp>::value > {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_enum_v = is_enum<_Tp>::value;
#endif
#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC)
// is_arithmetic
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic
: public integral_constant<bool, is_integral<_Tp>::value ||
is_floating_point<_Tp>::value> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
#endif
// is_fundamental
// Before Clang 10, __is_fundamental didn't work for nullptr_t.
// In C++03 nullptr_t is library-provided but must still count as "fundamental."
#if __has_keyword(__is_fundamental) && \
!(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) && \
!defined(_LIBCPP_CXX03_LANG)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_fundamental_v = __is_fundamental(_Tp);
#endif
#else // __has_keyword(__is_fundamental)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental
: public integral_constant<bool, is_void<_Tp>::value ||
__is_nullptr_t<_Tp>::value ||
is_arithmetic<_Tp>::value> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
#endif
#endif // __has_keyword(__is_fundamental)
// is_scalar
// In C++03 nullptr_t is library-provided but must still count as "scalar."
#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_scalar_v = __is_scalar(_Tp);
#endif
#else // __has_keyword(__is_scalar)
template <class _Tp> struct __is_block : false_type {};
#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS)
template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {};
#endif
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar
: public integral_constant<bool, is_arithmetic<_Tp>::value ||
is_member_pointer<_Tp>::value ||
is_pointer<_Tp>::value ||
__is_nullptr_t<_Tp>::value ||
__is_block<_Tp>::value ||
is_enum<_Tp>::value > {};
template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
#endif
#endif // __has_keyword(__is_scalar)
// is_object
#if __has_keyword(__is_object)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_object_v = __is_object(_Tp);
#endif
#else // __has_keyword(__is_object)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object
: public integral_constant<bool, is_scalar<_Tp>::value ||
is_array<_Tp>::value ||
is_union<_Tp>::value ||
is_class<_Tp>::value > {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_object_v = is_object<_Tp>::value;
#endif
#endif // __has_keyword(__is_object)
// is_compound
// >= 11 because in C++03 nullptr isn't actually nullptr
#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_compound_v = __is_compound(_Tp);
#endif
#else // __has_keyword(__is_compound)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound
: public integral_constant<bool, !is_fundamental<_Tp>::value> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_compound_v = is_compound<_Tp>::value;
#endif
#endif // __has_keyword(__is_compound)
// __is_referenceable [defns.referenceable]
struct __is_referenceable_impl {
template <class _Tp> static _Tp& __test(int);
template <class _Tp> static __two __test(...);
};
template <class _Tp>
struct __is_referenceable : integral_constant<bool,
_IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {};
// add_const
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const {
typedef _LIBCPP_NODEBUG const _Tp type;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_const_t = typename add_const<_Tp>::type;
#endif
// add_volatile
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile {
typedef _LIBCPP_NODEBUG volatile _Tp type;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type;
#endif
// add_cv
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv {
typedef _LIBCPP_NODEBUG const volatile _Tp type;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type;
#endif
// remove_reference
#if __has_keyword(__remove_reference)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS remove_reference { typedef __remove_reference(_Tp) type; };
#else // __has_keyword(__remove_reference)
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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type;
#endif
#endif // __has_keyword(__remove_reference)
// add_lvalue_reference
template <class _Tp, bool = __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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
#endif
template <class _Tp, bool = __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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
#endif
// Suppress deprecation notice for volatile-qualified return type resulting
// from volatile-qualified types _Tp.
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Tp> _Tp&& __declval(int);
template <class _Tp> _Tp __declval(long);
_LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Tp>
decltype(__declval<_Tp>(0))
declval() _NOEXCEPT;
// __uncvref
template <class _Tp>
struct __uncvref {
typedef _LIBCPP_NODEBUG typename remove_cv<typename remove_reference<_Tp>::type>::type type;
};
template <class _Tp>
struct __unconstref {
typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type;
};
#ifndef _LIBCPP_CXX03_LANG
template <class _Tp>
using __uncvref_t _LIBCPP_NODEBUG = typename __uncvref<_Tp>::type;
#endif
// __is_same_uncvref
template <class _Tp, class _Up>
struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type,
typename __uncvref<_Up>::type> {};
#if _LIBCPP_STD_VER > 17
// remove_cvref - same as __uncvref
template <class _Tp>
struct remove_cvref : public __uncvref<_Tp> {};
template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type;
#endif
struct __any
{
__any(...);
};
// remove_pointer
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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type;
#endif
// add_pointer
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;};
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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type;
#endif
// type_identity
#if _LIBCPP_STD_VER > 17
template<class _Tp> struct type_identity { typedef _Tp type; };
template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type;
#endif
// is_signed
// Before Clang 10, __is_signed didn't work for floating-point types or enums.
#if __has_keyword(__is_signed) && \
!(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_signed_v = __is_signed(_Tp);
#endif
#else // __has_keyword(__is_signed)
template <class _Tp, bool = is_integral<_Tp>::value>
struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {};
template <class _Tp>
struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point
template <class _Tp, bool = is_arithmetic<_Tp>::value>
struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {};
template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_signed_v = is_signed<_Tp>::value;
#endif
#endif // __has_keyword(__is_signed)
// is_unsigned
// Before Clang 13, __is_unsigned returned true for enums with signed underlying type.
// No currently-released version of AppleClang contains the fixed intrinsic.
#if __has_keyword(__is_unsigned) && \
!(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1300) && \
!defined(_LIBCPP_APPLE_CLANG_VER)
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
#endif
#else // __has_keyword(__is_unsigned)
template <class _Tp, bool = is_integral<_Tp>::value>
struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {};
template <class _Tp>
struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point
template <class _Tp, bool = is_arithmetic<_Tp>::value>
struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {};
template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
#endif
#endif // __has_keyword(__is_unsigned)
// rank
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank
: public integral_constant<size_t, 0> {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]>
: public integral_constant<size_t, rank<_Tp>::value + 1> {};
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]>
: public integral_constant<size_t, rank<_Tp>::value + 1> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr size_t rank_v = rank<_Tp>::value;
#endif
// extent
#if __has_keyword(__array_extent)
template<class _Tp, size_t _Dim = 0>
struct _LIBCPP_TEMPLATE_VIS extent
: integral_constant<size_t, __array_extent(_Tp, _Dim)> { };
#if _LIBCPP_STD_VER > 14
template <class _Tp, unsigned _Ip = 0>
inline constexpr size_t extent_v = __array_extent(_Tp, _Ip);
#endif
#else // __has_keyword(__array_extent)
template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent
: public integral_constant<size_t, 0> {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0>
: public integral_constant<size_t, 0> {};
template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip>
: public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {};
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0>
: public integral_constant<size_t, _Np> {};
template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip>
: public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp, unsigned _Ip = 0>
inline constexpr size_t extent_v = extent<_Tp, _Ip>::value;
#endif
#endif // __has_keyword(__array_extent)
// remove_extent
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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type;
#endif
// remove_all_extents
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;};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
#endif
#if _LIBCPP_STD_VER > 17
// is_bounded_array
template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {};
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {};
template <class _Tp>
inline constexpr
bool is_bounded_array_v = is_bounded_array<_Tp>::value;
// is_unbounded_array
template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {};
template <class _Tp>
inline constexpr
bool is_unbounded_array_v = is_unbounded_array<_Tp>::value;
#endif
// decay
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 remove_extent<_Up>::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;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using decay_t = typename decay<_Tp>::type;
#endif
// is_abstract
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract
: public integral_constant<bool, __is_abstract(_Tp)> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
#endif
// is_final
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS
__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {};
#if _LIBCPP_STD_VER > 11
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS
is_final : public integral_constant<bool, __is_final(_Tp)> {};
#endif
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_final_v = is_final<_Tp>::value;
#endif
// is_aggregate
#if _LIBCPP_STD_VER > 14
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS
is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {};
template <class _Tp>
inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
#endif // _LIBCPP_STD_VER > 14
// is_base_of
template <class _Bp, class _Dp>
struct _LIBCPP_TEMPLATE_VIS is_base_of
: public integral_constant<bool, __is_base_of(_Bp, _Dp)> {};
#if _LIBCPP_STD_VER > 14
template <class _Bp, class _Dp>
inline constexpr bool is_base_of_v = is_base_of<_Bp, _Dp>::value;
#endif
// __is_core_convertible
// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed.
// We can't test for that, but we can test implicit convertibility by passing it
// to a function. Notice that __is_core_convertible<void,void> is false,
// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later.
template <class _Tp, class _Up, class = void>
struct __is_core_convertible : public false_type {};
template <class _Tp, class _Up>
struct __is_core_convertible<_Tp, _Up, decltype(
static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() )
)> : public true_type {};
// is_convertible
#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible
: public integral_constant<bool, __is_convertible_to(_T1, _T2)> {};
#else // __has_feature(is_convertible_to)
namespace __is_convertible_imp
{
template <class _Tp> void __test_convert(_Tp);
template <class _From, class _To, class = void>
struct __is_convertible_test : public false_type {};
template <class _From, class _To>
struct __is_convertible_test<_From, _To,
decltype(__is_convertible_imp::__test_convert<_To>(declval<_From>()))> : public true_type
{};
template <class _Tp, bool _IsArray = is_array<_Tp>::value,
bool _IsFunction = is_function<_Tp>::value,
bool _IsVoid = is_void<_Tp>::value>
struct __is_array_function_or_void {enum {value = 0};};
template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};};
template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};};
template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};};
}
template <class _Tp,
unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value>
struct __is_convertible_check
{
static const size_t __v = 0;
};
template <class _Tp>
struct __is_convertible_check<_Tp, 0>
{
static const size_t __v = sizeof(_Tp);
};
template <class _T1, class _T2,
unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value,
unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value>
struct __is_convertible
: public integral_constant<bool,
__is_convertible_imp::__is_convertible_test<_T1, _T2>::value
>
{};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {};
template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {};
template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible
: public __is_convertible<_T1, _T2>
{
static const size_t __complete_check1 = __is_convertible_check<_T1>::__v;
static const size_t __complete_check2 = __is_convertible_check<_T2>::__v;
};
#endif // __has_feature(is_convertible_to)
#if _LIBCPP_STD_VER > 14
template <class _From, class _To>
inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
#endif
// is_nothrow_convertible
#if _LIBCPP_STD_VER > 17
template <typename _Tp>
static void __test_noexcept(_Tp) noexcept;
template<typename _Fm, typename _To>
static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))>
__is_nothrow_convertible_test();
template <typename _Fm, typename _To>
struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>())
{ };
template <typename _Fm, typename _To>
struct is_nothrow_convertible : _Or<
_And<is_void<_To>, is_void<_Fm>>,
_Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>>
>::type { };
template <typename _Fm, typename _To>
inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value;
#endif // _LIBCPP_STD_VER > 17
// is_empty
#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_empty
: public integral_constant<bool, __is_empty(_Tp)> {};
#else // __has_feature(is_empty)
template <class _Tp>
struct __is_empty1
: public _Tp
{
double __lx;
};
struct __is_empty2
{
double __lx;
};
template <class _Tp, bool = is_class<_Tp>::value>
struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {};
template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {};
#endif // __has_feature(is_empty)
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_empty_v = is_empty<_Tp>::value;
#endif
// is_polymorphic
#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_polymorphic
: public integral_constant<bool, __is_polymorphic(_Tp)> {};
#else
template<typename _Tp> char &__is_polymorphic_impl(
typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0,
int>::type);
template<typename _Tp> __two &__is_polymorphic_impl(...);
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic
: public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {};
#endif // __has_feature(is_polymorphic)
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
#endif
// has_virtual_destructor
#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor
: public integral_constant<bool, __has_virtual_destructor(_Tp)> {};
#else
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor
: public false_type {};
#endif
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr bool has_virtual_destructor_v = has_virtual_destructor<_Tp>::value;
#endif
// has_unique_object_representations
#if _LIBCPP_STD_VER > 14
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations
: public integral_constant<bool,
__has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {};
template <class _Tp>
inline constexpr bool has_unique_object_representations_v = has_unique_object_representations<_Tp>::value;
#endif
// alignment_of
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of
: public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
#endif
// aligned_storage
template <class _Hp, class _Tp>
struct __type_list
{
typedef _Hp _Head;
typedef _Tp _Tail;
};
struct __nat
{
#ifndef _LIBCPP_CXX03_LANG
__nat() = delete;
__nat(const __nat&) = delete;
__nat& operator=(const __nat&) = delete;
~__nat() = delete;
#endif
};
template <class _Tp>
struct __align_type
{
static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp);
typedef _Tp type;
};
struct __struct_double {long double __lx;};
struct __struct_double4 {double __lx[4];};
typedef
__type_list<__align_type<unsigned char>,
__type_list<__align_type<unsigned short>,
__type_list<__align_type<unsigned int>,
__type_list<__align_type<unsigned long>,
__type_list<__align_type<unsigned long long>,
__type_list<__align_type<double>,
__type_list<__align_type<long double>,
__type_list<__align_type<__struct_double>,
__type_list<__align_type<__struct_double4>,
__type_list<__align_type<int*>,
__nat
> > > > > > > > > > __all_types;
template <size_t _Align>
struct _ALIGNAS(_Align) __fallback_overaligned {};
template <class _TL, size_t _Align> struct __find_pod;
template <class _Hp, size_t _Align>
struct __find_pod<__type_list<_Hp, __nat>, _Align>
{
typedef typename conditional<
_Align == _Hp::value,
typename _Hp::type,
__fallback_overaligned<_Align>
>::type type;
};
template <class _Hp, class _Tp, size_t _Align>
struct __find_pod<__type_list<_Hp, _Tp>, _Align>
{
typedef typename conditional<
_Align == _Hp::value,
typename _Hp::type,
typename __find_pod<_Tp, _Align>::type
>::type type;
};
template <class _TL, size_t _Len> struct __find_max_align;
template <class _Hp, size_t _Len>
struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {};
template <size_t _Len, size_t _A1, size_t _A2>
struct __select_align
{
private:
static const size_t __min = _A2 < _A1 ? _A2 : _A1;
static const size_t __max = _A1 < _A2 ? _A2 : _A1;
public:
static const size_t value = _Len < __max ? __min : __max;
};
template <class _Hp, class _Tp, size_t _Len>
struct __find_max_align<__type_list<_Hp, _Tp>, _Len>
: public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {};
template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value>
struct _LIBCPP_TEMPLATE_VIS aligned_storage
{
typedef typename __find_pod<__all_types, _Align>::type _Aligner;
union type
{
_Aligner __align;
unsigned char __data[(_Len + _Align - 1)/_Align * _Align];
};
};
#if _LIBCPP_STD_VER > 11
template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value>
using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
#endif
#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \
template <size_t _Len>\
struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\
{\
struct _ALIGNAS(n) type\
{\
unsigned char __lx[(_Len + n - 1)/n * n];\
};\
}
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000);
// PE/COFF does not support alignment beyond 8192 (=0x2000)
#if !defined(_LIBCPP_OBJECT_FORMAT_COFF)
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000);
#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF)
#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION
// aligned_union
template <size_t _I0, size_t ..._In>
struct __static_max;
template <size_t _I0>
struct __static_max<_I0>
{
static const size_t value = _I0;
};
template <size_t _I0, size_t _I1, size_t ..._In>
struct __static_max<_I0, _I1, _In...>
{
static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value :
__static_max<_I1, _In...>::value;
};
template <size_t _Len, class _Type0, class ..._Types>
struct aligned_union
{
static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0),
_LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value;
static const size_t __len = __static_max<_Len, sizeof(_Type0),
sizeof(_Types)...>::value;
typedef typename aligned_storage<__len, alignment_value>::type type;
};
#if _LIBCPP_STD_VER > 11
template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
#endif
template <class _Tp>
struct __numeric_type
{
static void __test(...);
static float __test(float);
static double __test(char);
static double __test(int);
static double __test(unsigned);
static double __test(long);
static double __test(unsigned long);
static double __test(long long);
static double __test(unsigned long long);
static double __test(double);
static long double __test(long double);
typedef decltype(__test(declval<_Tp>())) type;
static const bool value = _IsNotSame<type, void>::value;
};
template <>
struct __numeric_type<void>
{
static const bool value = true;
};
// __promote
template <class _A1, class _A2 = void, class _A3 = void,
bool = __numeric_type<_A1>::value &&
__numeric_type<_A2>::value &&
__numeric_type<_A3>::value>
class __promote_imp
{
public:
static const bool value = false;
};
template <class _A1, class _A2, class _A3>
class __promote_imp<_A1, _A2, _A3, true>
{
private:
typedef typename __promote_imp<_A1>::type __type1;
typedef typename __promote_imp<_A2>::type __type2;
typedef typename __promote_imp<_A3>::type __type3;
public:
typedef decltype(__type1() + __type2() + __type3()) type;
static const bool value = true;
};
template <class _A1, class _A2>
class __promote_imp<_A1, _A2, void, true>
{
private:
typedef typename __promote_imp<_A1>::type __type1;
typedef typename __promote_imp<_A2>::type __type2;
public:
typedef decltype(__type1() + __type2()) type;
static const bool value = true;
};
template <class _A1>
class __promote_imp<_A1, void, void, true>
{
public:
typedef typename __numeric_type<_A1>::type type;
static const bool value = true;
};
template <class _A1, class _A2 = void, class _A3 = void>
class __promote : public __promote_imp<_A1, _A2, _A3> {};
// make_signed / make_unsigned
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
__type_list<__int128_t,
#endif
__nat
#ifndef _LIBCPP_HAS_NO_INT128
>
#endif
> > > > > __signed_types;
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
__type_list<__uint128_t,
#endif
__nat
#ifndef _LIBCPP_HAS_NO_INT128
>
#endif
> > > > > __unsigned_types;
template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first;
template <class _Hp, class _Tp, size_t _Size>
struct __find_first<__type_list<_Hp, _Tp>, _Size, true>
{
typedef _LIBCPP_NODEBUG _Hp type;
};
template <class _Hp, class _Tp, size_t _Size>
struct __find_first<__type_list<_Hp, _Tp>, _Size, false>
{
typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type;
};
template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value,
bool = is_volatile<typename remove_reference<_Tp>::type>::value>
struct __apply_cv
{
typedef _LIBCPP_NODEBUG _Up type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp, _Up, true, false>
{
typedef _LIBCPP_NODEBUG const _Up type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp, _Up, false, true>
{
typedef volatile _Up type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp, _Up, true, true>
{
typedef const volatile _Up type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp&, _Up, false, false>
{
typedef _Up& type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp&, _Up, true, false>
{
typedef const _Up& type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp&, _Up, false, true>
{
typedef volatile _Up& type;
};
template <class _Tp, class _Up>
struct __apply_cv<_Tp&, _Up, true, true>
{
typedef const volatile _Up& type;
};
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
template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;};
template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;};
#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;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type;
#endif
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
template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;};
template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;};
#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;
};
#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
#if _LIBCPP_STD_VER > 14
template <class...> using void_t = void;
#endif
#if _LIBCPP_STD_VER > 17
// Let COND_RES(X, Y) be:
template <class _Tp, class _Up>
using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>());
template <class _Tp, class _Up, class = void>
struct __common_type3 {};
// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..."
template <class _Tp, class _Up>
struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>>
{
using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>;
};
template <class _Tp, class _Up, class = void>
struct __common_type2_imp : __common_type3<_Tp, _Up> {};
#else
template <class _Tp, class _Up, class = void>
struct __common_type2_imp {};
#endif
// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..."
template <class _Tp, class _Up>
struct __common_type2_imp<_Tp, _Up,
typename __void_t<decltype(
true ? declval<_Tp>() : declval<_Up>()
)>::type>
{
typedef _LIBCPP_NODEBUG typename decay<decltype(
true ? declval<_Tp>() : declval<_Up>()
)>::type type;
};
template <class, class = void>
struct __common_type_impl {};
// Clang provides variadic templates in C++03 as an extension.
#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__)
# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__
template <class... Tp>
struct __common_types;
template <class... _Tp>
struct _LIBCPP_TEMPLATE_VIS common_type;
#else
# define _LIBCPP_OPTIONAL_PACK(...)
struct __no_arg;
template <class _Tp, class _Up, class = __no_arg>
struct __common_types;
template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg,
class _Unused = __no_arg>
struct common_type {
static_assert(sizeof(_Unused) == 0,
"common_type accepts at most 3 arguments in C++03");
};
#endif // _LIBCPP_CXX03_LANG
template <class _Tp, class _Up>
struct __common_type_impl<
__common_types<_Tp, _Up>,
typename __void_t<typename common_type<_Tp, _Up>::type>::type>
{
typedef typename common_type<_Tp, _Up>::type type;
};
template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)>
struct __common_type_impl<
__common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>,
typename __void_t<typename common_type<_Tp, _Up>::type>::type>
: __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type,
_Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {
};
// bullet 1 - sizeof...(Tp) == 0
template <>
struct _LIBCPP_TEMPLATE_VIS common_type<> {};
// bullet 2 - sizeof...(Tp) == 1
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS common_type<_Tp>
: public common_type<_Tp, _Tp> {};
// bullet 3 - sizeof...(Tp) == 2
// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..."
template <class _Tp, class _Up>
struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up>
: conditional<
_IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value,
__common_type2_imp<_Tp, _Up>,
common_type<typename decay<_Tp>::type, typename decay<_Up>::type>
>::type
{};
// bullet 4 - sizeof...(Tp) > 2
template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)>
struct _LIBCPP_TEMPLATE_VIS
common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>
: __common_type_impl<
__common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {};
#undef _LIBCPP_OPTIONAL_PACK
#if _LIBCPP_STD_VER > 11
template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type;
#endif
#if _LIBCPP_STD_VER > 11
// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's
// top-level cv-qualifiers.
template <class _From, class _To>
struct __copy_cv
{
using type = _To;
};
template <class _From, class _To>
struct __copy_cv<const _From, _To>
{
using type = add_const_t<_To>;
};
template <class _From, class _To>
struct __copy_cv<volatile _From, _To>
{
using type = add_volatile_t<_To>;
};
template <class _From, class _To>
struct __copy_cv<const volatile _From, _To>
{
using type = add_cv_t<_To>;
};
template <class _From, class _To>
using __copy_cv_t = typename __copy_cv<_From, _To>::type;
template <class _From, class _To>
struct __copy_cvref
{
using type = __copy_cv_t<_From, _To>;
};
template <class _From, class _To>
struct __copy_cvref<_From&, _To>
{
using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>;
};
template <class _From, class _To>
struct __copy_cvref<_From&&, _To>
{
using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>;
};
template <class _From, class _To>
using __copy_cvref_t = typename __copy_cvref<_From, _To>::type;
#endif // _LIBCPP_STD_VER > 11
// common_reference
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS)
// Let COND_RES(X, Y) be:
template <class _Xp, class _Yp>
using __cond_res =
decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()());
// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U`
// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type
// `U`.
// [Note: `XREF(A)` is `__xref<A>::template __apply`]
template <class _Tp>
struct __xref {
template<class _Up>
using __apply = __copy_cvref_t<_Tp, _Up>;
};
// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>,
// and let COMMON-REF(A, B) be:
template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>>
struct __common_ref;
template<class _Xp, class _Yp>
using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type;
template<class _Xp, class _Yp>
using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>;
// If A and B are both lvalue reference types, COMMON-REF(A, B) is
// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type.
template<class _Ap, class _Bp, class _Xp, class _Yp>
requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>>
struct __common_ref<_Ap&, _Bp&, _Xp, _Yp>
{
using __type = __cv_cond_res<_Xp, _Yp>;
};
// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ...
template <class _Xp, class _Yp>
using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&;
// .... If A and B are both rvalue reference types, C is well-formed, and
// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C.
template<class _Ap, class _Bp, class _Xp, class _Yp>
requires
requires { typename __common_ref_C<_Xp, _Yp>; } &&
is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> &&
is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>>
struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp>
{
using __type = __common_ref_C<_Xp, _Yp>;
};
// Otherwise, let D be COMMON-REF(const X&, Y&). ...
template <class _Tp, class _Up>
using __common_ref_D = __common_ref_t<const _Tp&, _Up&>;
// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and
// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D.
template<class _Ap, class _Bp, class _Xp, class _Yp>
requires requires { typename __common_ref_D<_Xp, _Yp>; } &&
is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>>
struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp>
{
using __type = __common_ref_D<_Xp, _Yp>;
};
// Otherwise, if A is an lvalue reference and B is an rvalue reference, then
// COMMON-REF(A, B) is COMMON-REF(B, A).
template<class _Ap, class _Bp, class _Xp, class _Yp>
struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {};
// Otherwise, COMMON-REF(A, B) is ill-formed.
template<class _Ap, class _Bp, class _Xp, class _Yp>
struct __common_ref {};
// Note C: For the common_reference trait applied to a parameter pack [...]
template <class...>
struct common_reference;
template <class... _Types>
using common_reference_t = typename common_reference<_Types...>::type;
// bullet 1 - sizeof...(T) == 0
template<>
struct common_reference<> {};
// bullet 2 - sizeof...(T) == 1
template <class _Tp>
struct common_reference<_Tp>
{
using type = _Tp;
};
// bullet 3 - sizeof...(T) == 2
template <class _Tp, class _Up> struct __common_reference_sub_bullet3;
template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {};
template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {};
// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then
// the member typedef `type` denotes that type.
template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {};
template <class _Tp, class _Up>
requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; }
struct __common_reference_sub_bullet1<_Tp, _Up>
{
using type = __common_ref_t<_Tp, _Up>;
};
// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type
// is well-formed, then the member typedef `type` denotes that type.
template <class, class, template <class> class, template <class> class> struct basic_common_reference {};
template <class _Tp, class _Up>
using __basic_common_reference_t = typename basic_common_reference<
remove_cvref_t<_Tp>, remove_cvref_t<_Up>,
__xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type;
template <class _Tp, class _Up>
requires requires { typename __basic_common_reference_t<_Tp, _Up>; }
struct __common_reference_sub_bullet2<_Tp, _Up>
{
using type = __basic_common_reference_t<_Tp, _Up>;
};
// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed,
// then the member typedef `type` denotes that type.
template <class _Tp, class _Up>
requires requires { typename __cond_res<_Tp, _Up>; }
struct __common_reference_sub_bullet3<_Tp, _Up>
{
using type = __cond_res<_Tp, _Up>;
};
// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed,
// then the member typedef `type` denotes that type.
// - Otherwise, there shall be no member `type`.
template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {};
// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if
// any, as `common_reference_t<C, Rest...>`.
template <class _Tp, class _Up, class _Vp, class... _Rest>
requires requires { typename common_reference_t<_Tp, _Up>; }
struct common_reference<_Tp, _Up, _Vp, _Rest...>
: common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...>
{};
// bullet 5 - Otherwise, there shall be no member `type`.
template <class...> struct common_reference {};
#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS)
// is_assignable
template<