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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_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;
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
template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>;
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, std::size_t Align=default-alignment>
using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14
template <std::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
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
// 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
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
typedef _LIBCPP_BOOL_CONSTANT(true) true_type;
typedef _LIBCPP_BOOL_CONSTANT(false) false_type;
template <bool _Val>
using _BoolConstant _LIBCPP_NODEBUG_TYPE = integral_constant<bool, _Val>;
template <bool> struct _MetaBase;
template <>
struct _MetaBase<true> {
template <class _Tp, class _Up>
using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Tp;
template <template <class...> class _FirstFn, template <class...> class, class ..._Args>
using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _FirstFn<_Args...>;
template <class _First, class...>
using _FirstImpl _LIBCPP_NODEBUG_TYPE = _First;
template <class, class _Second, class...>
using _SecondImpl _LIBCPP_NODEBUG_TYPE = _Second;
template <class _Tp = void>
using _EnableIfImpl _LIBCPP_NODEBUG_TYPE = _Tp;
template <class _Result, class _First, class ..._Rest>
using _OrImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>;
template <class _Result, class _First, class ..._Rest>
using _AndImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value == true && sizeof...(_Rest) != 0>::template _AndImpl<_First, _Rest...>;
};
template <>
struct _MetaBase<false> {
template <class _Tp, class _Up>
using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Up;
template <template <class...> class, template <class...> class _SecondFn, class ..._Args>
using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _SecondFn<_Args...>;
template <class _Result, class ...>
using _OrImpl _LIBCPP_NODEBUG_TYPE = _Result;
template <class _Result, class ...>
using _AndImpl _LIBCPP_NODEBUG_TYPE = _Result;
};
template <bool _Cond, class _Ret = void>
using _EnableIf _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>;
template <bool _Cond, class _IfRes, class _ElseRes>
using _If _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>;
template <class ..._Rest>
using _Or _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>;
template <class ..._Rest>
using _And _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _AndImpl<true_type, _Rest...>;
template <class _Pred>
struct _Not : _BoolConstant<!_Pred::value> {};
template <class ..._Args>
using _FirstType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>;
template <class ..._Args>
using _SecondType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>;
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_TYPE = decltype(std::__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, 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
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;};
#if _LIBCPP_STD_VER > 11
template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type;
#endif
// is_same
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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp, class _Up>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v
= is_same<_Tp, _Up>::value;
#endif
template <class _Tp, class _Up>
using _IsSame = _BoolConstant<
#ifdef __clang__
__is_same(_Tp, _Up)
#else
_VSTD::is_same<_Tp, _Up>::value
#endif
>;
template <class _Tp, class _Up>
using _IsNotSame = _BoolConstant<
#ifdef __clang__
!__is_same(_Tp, _Up)
#else
!_VSTD::is_same<_Tp, _Up>::value
#endif
>;
// addressof
#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
template <class _Tp>
inline _LIBCPP_CONSTEXPR_AFTER_CXX14
_LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY
_Tp*
addressof(_Tp& __x) _NOEXCEPT
{
return __builtin_addressof(__x);
}
#else
template <class _Tp>
inline _LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY
_Tp*
addressof(_Tp& __x) _NOEXCEPT
{
return reinterpret_cast<_Tp *>(
const_cast<char *>(&reinterpret_cast<const volatile char &>(__x)));
}
#endif // _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF)
// Objective-C++ Automatic Reference Counting uses qualified pointers
// that require special addressof() signatures. When
// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler
// itself is providing these definitions. Otherwise, we provide them.
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
__strong _Tp*
addressof(__strong _Tp& __x) _NOEXCEPT
{
return &__x;
}
#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
__weak _Tp*
addressof(__weak _Tp& __x) _NOEXCEPT
{
return &__x;
}
#endif
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
__autoreleasing _Tp*
addressof(__autoreleasing _Tp& __x) _NOEXCEPT
{
return &__x;
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
__unsafe_unretained _Tp*
addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT
{
return &__x;
}
#endif
#if !defined(_LIBCPP_CXX03_LANG)
template <class _Tp> _Tp* addressof(const _Tp&&) noexcept = delete;
#endif
struct __two {char __lx[2];};
// helper class:
// is_const
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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v
= is_const<_Tp>::value;
#endif
// is_volatile
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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v
= is_volatile<_Tp>::value;
#endif
// remove_const
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
// remove_volatile
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
// remove_cv
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
// is_void
template <class _Tp> struct __libcpp_is_void : public false_type {};
template <> struct __libcpp_is_void<void> : public true_type {};
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void
: public __libcpp_is_void<typename remove_cv<_Tp>::type> {};
#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v
= is_void<_Tp>::value;
#endif
// __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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_null_pointer_v
= is_null_pointer<_Tp>::value;
#endif
#endif
// is_integral
template <class _Tp> struct __libcpp_is_integral : public false_type {};
template <> struct __libcpp_is_integral<bool> : public true_type {};
template <> struct __libcpp_is_integral<char> : public true_type {};
template <> struct __libcpp_is_integral<signed char> : public true_type {};
template <> struct __libcpp_is_integral<unsigned char> : public true_type {};
template <> struct __libcpp_is_integral<wchar_t> : public true_type {};
#ifndef _LIBCPP_NO_HAS_CHAR8_T
template <> struct __libcpp_is_integral<char8_t> : public true_type {};
#endif
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
template <> struct __libcpp_is_integral<char16_t> : public true_type {};
template <> struct __libcpp_is_integral<char32_t> : public true_type {};
#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
template <> struct __libcpp_is_integral<short> : public true_type {};
template <> struct __libcpp_is_integral<unsigned short> : public true_type {};
template <> struct __libcpp_is_integral<int> : public true_type {};
template <> struct __libcpp_is_integral<unsigned int> : public true_type {};
template <> struct __libcpp_is_integral<long> : public true_type {};
template <> struct __libcpp_is_integral<unsigned long> : public true_type {};
template <> struct __libcpp_is_integral<long long> : public true_type {};
template <> struct __libcpp_is_integral<unsigned long long> : public true_type {};
#ifndef _LIBCPP_HAS_NO_INT128
template <> struct __libcpp_is_integral<__int128_t> : public true_type {};
template <> struct __libcpp_is_integral<__uint128_t> : public true_type {};
#endif
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral
: public __libcpp_is_integral<typename remove_cv<_Tp>::type> {};
#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v
= is_integral<_Tp>::value;
#endif
// is_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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_floating_point_v
= is_floating_point<_Tp>::value;
#endif
// is_array
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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v
= is_array<_Tp>::value;
#endif
// 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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v
= is_pointer<_Tp>::value;
#endif
// is_reference
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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v
= is_reference<_Tp>::value;
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v
= is_lvalue_reference<_Tp>::value;
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v
= is_rvalue_reference<_Tp>::value;
#endif
// 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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_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,
};
};
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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v
= is_member_function_pointer<_Tp>::value;
#endif
// 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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v
= is_member_pointer<_Tp>::value;
#endif
// 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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v
= is_member_object_pointer<_Tp>::value;
#endif
// 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)> {};
#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 > {};
#endif
#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v
= is_enum<_Tp>::value;
#endif
// 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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v
= is_arithmetic<_Tp>::value;
#endif
// 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 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)