blob: d3693b1069e5f23aa6db9d84e4670a78e10ba8b9 [file] [log] [blame]
// C++11 <type_traits> -*- C++ -*-
// Copyright (C) 2007-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/type_traits
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_TYPE_TRAITS
#define _GLIBCXX_TYPE_TRAITS 1
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <bits/c++config.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
class reference_wrapper;
/**
* @defgroup metaprogramming Metaprogramming
* @ingroup utilities
*
* Template utilities for compile-time introspection and modification,
* including type classification traits, type property inspection traits
* and type transformation traits.
*
* @since C++11
*
* @{
*/
/// integral_constant
template<typename _Tp, _Tp __v>
struct integral_constant
{
static constexpr _Tp value = __v;
typedef _Tp value_type;
typedef integral_constant<_Tp, __v> type;
constexpr operator value_type() const noexcept { return value; }
#if __cplusplus > 201103L
#define __cpp_lib_integral_constant_callable 201304
constexpr value_type operator()() const noexcept { return value; }
#endif
};
#if ! __cpp_inline_variables
template<typename _Tp, _Tp __v>
constexpr _Tp integral_constant<_Tp, __v>::value;
#endif
/// The type used as a compile-time boolean with true value.
using true_type = integral_constant<bool, true>;
/// The type used as a compile-time boolean with false value.
using false_type = integral_constant<bool, false>;
/// @cond undocumented
/// bool_constant for C++11
template<bool __v>
using __bool_constant = integral_constant<bool, __v>;
/// @endcond
#if __cplusplus >= 201703L
# define __cpp_lib_bool_constant 201505
/// Alias template for compile-time boolean constant types.
/// @since C++17
template<bool __v>
using bool_constant = integral_constant<bool, __v>;
#endif
// Metaprogramming helper types.
template<bool>
struct __conditional
{
template<typename _Tp, typename>
using type = _Tp;
};
template<>
struct __conditional<false>
{
template<typename, typename _Up>
using type = _Up;
};
// More efficient version of std::conditional_t for internal use (and C++11)
template<bool _Cond, typename _If, typename _Else>
using __conditional_t
= typename __conditional<_Cond>::template type<_If, _Else>;
/// @cond undocumented
template <typename _Type>
struct __type_identity
{ using type = _Type; };
template<typename _Tp>
using __type_identity_t = typename __type_identity<_Tp>::type;
template<typename...>
struct __or_;
template<>
struct __or_<>
: public false_type
{ };
template<typename _B1>
struct __or_<_B1>
: public _B1
{ };
template<typename _B1, typename _B2>
struct __or_<_B1, _B2>
: public __conditional_t<_B1::value, _B1, _B2>
{ };
template<typename _B1, typename _B2, typename _B3, typename... _Bn>
struct __or_<_B1, _B2, _B3, _Bn...>
: public __conditional_t<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>
{ };
template<typename...>
struct __and_;
template<>
struct __and_<>
: public true_type
{ };
template<typename _B1>
struct __and_<_B1>
: public _B1
{ };
template<typename _B1, typename _B2>
struct __and_<_B1, _B2>
: public __conditional_t<_B1::value, _B2, _B1>
{ };
template<typename _B1, typename _B2, typename _B3, typename... _Bn>
struct __and_<_B1, _B2, _B3, _Bn...>
: public __conditional_t<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>
{ };
template<typename _Pp>
struct __not_
: public __bool_constant<!bool(_Pp::value)>
{ };
/// @endcond
#if __cplusplus >= 201703L
/// @cond undocumented
template<typename... _Bn>
inline constexpr bool __or_v = __or_<_Bn...>::value;
template<typename... _Bn>
inline constexpr bool __and_v = __and_<_Bn...>::value;
/// @endcond
#define __cpp_lib_logical_traits 201510
template<typename... _Bn>
struct conjunction
: __and_<_Bn...>
{ };
template<typename... _Bn>
struct disjunction
: __or_<_Bn...>
{ };
template<typename _Pp>
struct negation
: __not_<_Pp>
{ };
/** @ingroup variable_templates
* @{
*/
template<typename... _Bn>
inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
template<typename... _Bn>
inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
template<typename _Pp>
inline constexpr bool negation_v = negation<_Pp>::value;
/// @}
#endif // C++17
// Forward declarations
template<typename>
struct is_reference;
template<typename>
struct is_function;
template<typename>
struct is_void;
template<typename>
struct remove_cv;
template<typename>
struct is_const;
/// @cond undocumented
template<typename>
struct __is_array_unknown_bounds;
// Helper functions that return false_type for incomplete classes,
// incomplete unions and arrays of known bound from those.
template <typename _Tp, size_t = sizeof(_Tp)>
constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>)
{ return {}; }
template <typename _TypeIdentity,
typename _NestedType = typename _TypeIdentity::type>
constexpr typename __or_<
is_reference<_NestedType>,
is_function<_NestedType>,
is_void<_NestedType>,
__is_array_unknown_bounds<_NestedType>
>::type __is_complete_or_unbounded(_TypeIdentity)
{ return {}; }
// For several sfinae-friendly trait implementations we transport both the
// result information (as the member type) and the failure information (no
// member type). This is very similar to std::enable_if, but we cannot use
// them, because we need to derive from them as an implementation detail.
template<typename _Tp>
struct __success_type
{ typedef _Tp type; };
struct __failure_type
{ };
// __remove_cv_t (std::remove_cv_t for C++11).
template<typename _Tp>
using __remove_cv_t = typename remove_cv<_Tp>::type;
// Primary type categories.
template<typename>
struct __is_void_helper
: public false_type { };
template<>
struct __is_void_helper<void>
: public true_type { };
/// @endcond
/// is_void
template<typename _Tp>
struct is_void
: public __is_void_helper<__remove_cv_t<_Tp>>::type
{ };
/// @cond undocumented
template<typename>
struct __is_integral_helper
: public false_type { };
template<>
struct __is_integral_helper<bool>
: public true_type { };
template<>
struct __is_integral_helper<char>
: public true_type { };
template<>
struct __is_integral_helper<signed char>
: public true_type { };
template<>
struct __is_integral_helper<unsigned char>
: public true_type { };
// We want is_integral<wchar_t> to be true (and make_signed/unsigned to work)
// even when libc doesn't provide working <wchar.h> and related functions,
// so don't check _GLIBCXX_USE_WCHAR_T here.
template<>
struct __is_integral_helper<wchar_t>
: public true_type { };
#ifdef _GLIBCXX_USE_CHAR8_T
template<>
struct __is_integral_helper<char8_t>
: public true_type { };
#endif
template<>
struct __is_integral_helper<char16_t>
: public true_type { };
template<>
struct __is_integral_helper<char32_t>
: public true_type { };
template<>
struct __is_integral_helper<short>
: public true_type { };
template<>
struct __is_integral_helper<unsigned short>
: public true_type { };
template<>
struct __is_integral_helper<int>
: public true_type { };
template<>
struct __is_integral_helper<unsigned int>
: public true_type { };
template<>
struct __is_integral_helper<long>
: public true_type { };
template<>
struct __is_integral_helper<unsigned long>
: public true_type { };
template<>
struct __is_integral_helper<long long>
: public true_type { };
template<>
struct __is_integral_helper<unsigned long long>
: public true_type { };
// Conditionalizing on __STRICT_ANSI__ here will break any port that
// uses one of these types for size_t.
#if defined(__GLIBCXX_TYPE_INT_N_0)
__extension__
template<>
struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
: public true_type { };
__extension__
template<>
struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
: public true_type { };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
__extension__
template<>
struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
: public true_type { };
__extension__
template<>
struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
: public true_type { };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
__extension__
template<>
struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
: public true_type { };
__extension__
template<>
struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
: public true_type { };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_3)
__extension__
template<>
struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
: public true_type { };
__extension__
template<>
struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
: public true_type { };
#endif
/// @endcond
/// is_integral
template<typename _Tp>
struct is_integral
: public __is_integral_helper<__remove_cv_t<_Tp>>::type
{ };
/// @cond undocumented
template<typename>
struct __is_floating_point_helper
: public false_type { };
template<>
struct __is_floating_point_helper<float>
: public true_type { };
template<>
struct __is_floating_point_helper<double>
: public true_type { };
template<>
struct __is_floating_point_helper<long double>
: public true_type { };
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
template<>
struct __is_floating_point_helper<__float128>
: public true_type { };
#endif
/// @endcond
/// is_floating_point
template<typename _Tp>
struct is_floating_point
: public __is_floating_point_helper<__remove_cv_t<_Tp>>::type
{ };
/// is_array
template<typename>
struct is_array
: public false_type { };
template<typename _Tp, std::size_t _Size>
struct is_array<_Tp[_Size]>
: public true_type { };
template<typename _Tp>
struct is_array<_Tp[]>
: public true_type { };
template<typename>
struct __is_pointer_helper
: public false_type { };
template<typename _Tp>
struct __is_pointer_helper<_Tp*>
: public true_type { };
/// is_pointer
template<typename _Tp>
struct is_pointer
: public __is_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
/// is_lvalue_reference
template<typename>
struct is_lvalue_reference
: public false_type { };
template<typename _Tp>
struct is_lvalue_reference<_Tp&>
: public true_type { };
/// is_rvalue_reference
template<typename>
struct is_rvalue_reference
: public false_type { };
template<typename _Tp>
struct is_rvalue_reference<_Tp&&>
: public true_type { };
template<typename>
struct __is_member_object_pointer_helper
: public false_type { };
template<typename _Tp, typename _Cp>
struct __is_member_object_pointer_helper<_Tp _Cp::*>
: public __not_<is_function<_Tp>>::type { };
/// is_member_object_pointer
template<typename _Tp>
struct is_member_object_pointer
: public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
template<typename>
struct __is_member_function_pointer_helper
: public false_type { };
template<typename _Tp, typename _Cp>
struct __is_member_function_pointer_helper<_Tp _Cp::*>
: public is_function<_Tp>::type { };
/// is_member_function_pointer
template<typename _Tp>
struct is_member_function_pointer
: public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
/// is_enum
template<typename _Tp>
struct is_enum
: public integral_constant<bool, __is_enum(_Tp)>
{ };
/// is_union
template<typename _Tp>
struct is_union
: public integral_constant<bool, __is_union(_Tp)>
{ };
/// is_class
template<typename _Tp>
struct is_class
: public integral_constant<bool, __is_class(_Tp)>
{ };
/// is_function
template<typename _Tp>
struct is_function
: public __bool_constant<!is_const<const _Tp>::value> { };
template<typename _Tp>
struct is_function<_Tp&>
: public false_type { };
template<typename _Tp>
struct is_function<_Tp&&>
: public false_type { };
#define __cpp_lib_is_null_pointer 201309
template<typename>
struct __is_null_pointer_helper
: public false_type { };
template<>
struct __is_null_pointer_helper<std::nullptr_t>
: public true_type { };
/// is_null_pointer (LWG 2247).
template<typename _Tp>
struct is_null_pointer
: public __is_null_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
/// __is_nullptr_t (deprecated extension).
/// @deprecated Non-standard. Use `is_null_pointer` instead.
template<typename _Tp>
struct __is_nullptr_t
: public is_null_pointer<_Tp>
{ } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer");
// Composite type categories.
/// is_reference
template<typename _Tp>
struct is_reference
: public __or_<is_lvalue_reference<_Tp>,
is_rvalue_reference<_Tp>>::type
{ };
/// is_arithmetic
template<typename _Tp>
struct is_arithmetic
: public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
{ };
/// is_fundamental
template<typename _Tp>
struct is_fundamental
: public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
is_null_pointer<_Tp>>::type
{ };
/// is_object
template<typename _Tp>
struct is_object
: public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
is_void<_Tp>>>::type
{ };
template<typename>
struct is_member_pointer;
/// is_scalar
template<typename _Tp>
struct is_scalar
: public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
{ };
/// is_compound
template<typename _Tp>
struct is_compound
: public __not_<is_fundamental<_Tp>>::type { };
/// @cond undocumented
template<typename _Tp>
struct __is_member_pointer_helper
: public false_type { };
template<typename _Tp, typename _Cp>
struct __is_member_pointer_helper<_Tp _Cp::*>
: public true_type { };
/// @endcond
/// is_member_pointer
template<typename _Tp>
struct is_member_pointer
: public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
template<typename, typename>
struct is_same;
/// @cond undocumented
template<typename _Tp, typename... _Types>
using __is_one_of = __or_<is_same<_Tp, _Types>...>;
// Check if a type is one of the signed integer types.
__extension__
template<typename _Tp>
using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>,
signed char, signed short, signed int, signed long,
signed long long
#if defined(__GLIBCXX_TYPE_INT_N_0)
, signed __GLIBCXX_TYPE_INT_N_0
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
, signed __GLIBCXX_TYPE_INT_N_1
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
, signed __GLIBCXX_TYPE_INT_N_2
#endif
#if defined(__GLIBCXX_TYPE_INT_N_3)
, signed __GLIBCXX_TYPE_INT_N_3
#endif
>;
// Check if a type is one of the unsigned integer types.
__extension__
template<typename _Tp>
using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>,
unsigned char, unsigned short, unsigned int, unsigned long,
unsigned long long
#if defined(__GLIBCXX_TYPE_INT_N_0)
, unsigned __GLIBCXX_TYPE_INT_N_0
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
, unsigned __GLIBCXX_TYPE_INT_N_1
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
, unsigned __GLIBCXX_TYPE_INT_N_2
#endif
#if defined(__GLIBCXX_TYPE_INT_N_3)
, unsigned __GLIBCXX_TYPE_INT_N_3
#endif
>;
// Check if a type is one of the signed or unsigned integer types.
template<typename _Tp>
using __is_standard_integer
= __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>;
// __void_t (std::void_t for C++11)
template<typename...> using __void_t = void;
// Utility to detect referenceable types ([defns.referenceable]).
template<typename _Tp, typename = void>
struct __is_referenceable
: public false_type
{ };
template<typename _Tp>
struct __is_referenceable<_Tp, __void_t<_Tp&>>
: public true_type
{ };
/// @endcond
// Type properties.
/// is_const
template<typename>
struct is_const
: public false_type { };
template<typename _Tp>
struct is_const<_Tp const>
: public true_type { };
/// is_volatile
template<typename>
struct is_volatile
: public false_type { };
template<typename _Tp>
struct is_volatile<_Tp volatile>
: public true_type { };
/// is_trivial
template<typename _Tp>
struct is_trivial
: public integral_constant<bool, __is_trivial(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_trivially_copyable
template<typename _Tp>
struct is_trivially_copyable
: public integral_constant<bool, __is_trivially_copyable(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_standard_layout
template<typename _Tp>
struct is_standard_layout
: public integral_constant<bool, __is_standard_layout(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/** is_pod
* @deprecated Deprecated in C++20.
* Use `is_standard_layout && is_trivial` instead.
*/
// Could use is_standard_layout && is_trivial instead of the builtin.
template<typename _Tp>
struct
_GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead")
is_pod
: public integral_constant<bool, __is_pod(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/** is_literal_type
* @deprecated Deprecated in C++17, removed in C++20.
* The idea of a literal type isn't useful.
*/
template<typename _Tp>
struct
_GLIBCXX17_DEPRECATED
is_literal_type
: public integral_constant<bool, __is_literal_type(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_empty
template<typename _Tp>
struct is_empty
: public integral_constant<bool, __is_empty(_Tp)>
{ };
/// is_polymorphic
template<typename _Tp>
struct is_polymorphic
: public integral_constant<bool, __is_polymorphic(_Tp)>
{ };
#if __cplusplus >= 201402L
#define __cpp_lib_is_final 201402L
/// is_final
/// @since C++14
template<typename _Tp>
struct is_final
: public integral_constant<bool, __is_final(_Tp)>
{ };
#endif
/// is_abstract
template<typename _Tp>
struct is_abstract
: public integral_constant<bool, __is_abstract(_Tp)>
{ };
/// @cond undocumented
template<typename _Tp,
bool = is_arithmetic<_Tp>::value>
struct __is_signed_helper
: public false_type { };
template<typename _Tp>
struct __is_signed_helper<_Tp, true>
: public integral_constant<bool, _Tp(-1) < _Tp(0)>
{ };
/// @endcond
/// is_signed
template<typename _Tp>
struct is_signed
: public __is_signed_helper<_Tp>::type
{ };
/// is_unsigned
template<typename _Tp>
struct is_unsigned
: public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
{ };
/// @cond undocumented
template<typename _Tp, typename _Up = _Tp&&>
_Up
__declval(int);
template<typename _Tp>
_Tp
__declval(long);
/// @endcond
template<typename _Tp>
auto declval() noexcept -> decltype(__declval<_Tp>(0));
template<typename, unsigned = 0>
struct extent;
template<typename>
struct remove_all_extents;
/// @cond undocumented
template<typename _Tp>
struct __is_array_known_bounds
: public integral_constant<bool, (extent<_Tp>::value > 0)>
{ };
template<typename _Tp>
struct __is_array_unknown_bounds
: public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
{ };
// Destructible and constructible type properties.
// In N3290 is_destructible does not say anything about function
// types and abstract types, see LWG 2049. This implementation
// describes function types as non-destructible and all complete
// object types as destructible, iff the explicit destructor
// call expression is wellformed.
struct __do_is_destructible_impl
{
template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
static true_type __test(int);
template<typename>
static false_type __test(...);
};
template<typename _Tp>
struct __is_destructible_impl
: public __do_is_destructible_impl
{
typedef decltype(__test<_Tp>(0)) type;
};
template<typename _Tp,
bool = __or_<is_void<_Tp>,
__is_array_unknown_bounds<_Tp>,
is_function<_Tp>>::value,
bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
struct __is_destructible_safe;
template<typename _Tp>
struct __is_destructible_safe<_Tp, false, false>
: public __is_destructible_impl<typename
remove_all_extents<_Tp>::type>::type
{ };
template<typename _Tp>
struct __is_destructible_safe<_Tp, true, false>
: public false_type { };
template<typename _Tp>
struct __is_destructible_safe<_Tp, false, true>
: public true_type { };
/// @endcond
/// is_destructible
template<typename _Tp>
struct is_destructible
: public __is_destructible_safe<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
// is_nothrow_destructible requires that is_destructible is
// satisfied as well. We realize that by mimicing the
// implementation of is_destructible but refer to noexcept(expr)
// instead of decltype(expr).
struct __do_is_nt_destructible_impl
{
template<typename _Tp>
static __bool_constant<noexcept(declval<_Tp&>().~_Tp())>
__test(int);
template<typename>
static false_type __test(...);
};
template<typename _Tp>
struct __is_nt_destructible_impl
: public __do_is_nt_destructible_impl
{
typedef decltype(__test<_Tp>(0)) type;
};
template<typename _Tp,
bool = __or_<is_void<_Tp>,
__is_array_unknown_bounds<_Tp>,
is_function<_Tp>>::value,
bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
struct __is_nt_destructible_safe;
template<typename _Tp>
struct __is_nt_destructible_safe<_Tp, false, false>
: public __is_nt_destructible_impl<typename
remove_all_extents<_Tp>::type>::type
{ };
template<typename _Tp>
struct __is_nt_destructible_safe<_Tp, true, false>
: public false_type { };
template<typename _Tp>
struct __is_nt_destructible_safe<_Tp, false, true>
: public true_type { };
/// @endcond
/// is_nothrow_destructible
template<typename _Tp>
struct is_nothrow_destructible
: public __is_nt_destructible_safe<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
template<typename _Tp, typename... _Args>
struct __is_constructible_impl
: public __bool_constant<__is_constructible(_Tp, _Args...)>
{ };
/// @endcond
/// is_constructible
template<typename _Tp, typename... _Args>
struct is_constructible
: public __is_constructible_impl<_Tp, _Args...>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_default_constructible
template<typename _Tp>
struct is_default_constructible
: public __is_constructible_impl<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_copy_constructible_impl;
template<typename _Tp>
struct __is_copy_constructible_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_copy_constructible_impl<_Tp, true>
: public __is_constructible_impl<_Tp, const _Tp&>
{ };
/// @endcond
/// is_copy_constructible
template<typename _Tp>
struct is_copy_constructible
: public __is_copy_constructible_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_move_constructible_impl;
template<typename _Tp>
struct __is_move_constructible_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_move_constructible_impl<_Tp, true>
: public __is_constructible_impl<_Tp, _Tp&&>
{ };
/// @endcond
/// is_move_constructible
template<typename _Tp>
struct is_move_constructible
: public __is_move_constructible_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
template<typename _Tp, typename... _Args>
using __is_nothrow_constructible_impl
= __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>;
/// @endcond
/// is_nothrow_constructible
template<typename _Tp, typename... _Args>
struct is_nothrow_constructible
: public __is_nothrow_constructible_impl<_Tp, _Args...>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_nothrow_default_constructible
template<typename _Tp>
struct is_nothrow_default_constructible
: public __bool_constant<__is_nothrow_constructible(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_nothrow_copy_constructible_impl;
template<typename _Tp>
struct __is_nothrow_copy_constructible_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_nothrow_copy_constructible_impl<_Tp, true>
: public __is_nothrow_constructible_impl<_Tp, const _Tp&>
{ };
/// @endcond
/// is_nothrow_copy_constructible
template<typename _Tp>
struct is_nothrow_copy_constructible
: public __is_nothrow_copy_constructible_impl<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// @cond undocumented
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_nothrow_move_constructible_impl;
template<typename _Tp>
struct __is_nothrow_move_constructible_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_nothrow_move_constructible_impl<_Tp, true>
: public __is_nothrow_constructible_impl<_Tp, _Tp&&>
{ };
/// @endcond
/// is_nothrow_move_constructible
template<typename _Tp>
struct is_nothrow_move_constructible
: public __is_nothrow_move_constructible_impl<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_assignable
template<typename _Tp, typename _Up>
struct is_assignable
: public __bool_constant<__is_assignable(_Tp, _Up)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_copy_assignable_impl;
template<typename _Tp>
struct __is_copy_assignable_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_copy_assignable_impl<_Tp, true>
: public __bool_constant<__is_assignable(_Tp&, const _Tp&)>
{ };
/// is_copy_assignable
template<typename _Tp>
struct is_copy_assignable
: public __is_copy_assignable_impl<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_move_assignable_impl;
template<typename _Tp>
struct __is_move_assignable_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_move_assignable_impl<_Tp, true>
: public __bool_constant<__is_assignable(_Tp&, _Tp&&)>
{ };
/// is_move_assignable
template<typename _Tp>
struct is_move_assignable
: public __is_move_assignable_impl<_Tp>::type
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, typename _Up>
using __is_nothrow_assignable_impl
= __bool_constant<__is_nothrow_assignable(_Tp, _Up)>;
/// is_nothrow_assignable
template<typename _Tp, typename _Up>
struct is_nothrow_assignable
: public __is_nothrow_assignable_impl<_Tp, _Up>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_nt_copy_assignable_impl;
template<typename _Tp>
struct __is_nt_copy_assignable_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_nt_copy_assignable_impl<_Tp, true>
: public __is_nothrow_assignable_impl<_Tp&, const _Tp&>
{ };
/// is_nothrow_copy_assignable
template<typename _Tp>
struct is_nothrow_copy_assignable
: public __is_nt_copy_assignable_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_nt_move_assignable_impl;
template<typename _Tp>
struct __is_nt_move_assignable_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_nt_move_assignable_impl<_Tp, true>
: public __is_nothrow_assignable_impl<_Tp&, _Tp&&>
{ };
/// is_nothrow_move_assignable
template<typename _Tp>
struct is_nothrow_move_assignable
: public __is_nt_move_assignable_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_trivially_constructible
template<typename _Tp, typename... _Args>
struct is_trivially_constructible
: public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_trivially_default_constructible
template<typename _Tp>
struct is_trivially_default_constructible
: public __bool_constant<__is_trivially_constructible(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
struct __do_is_implicitly_default_constructible_impl
{
template <typename _Tp>
static void __helper(const _Tp&);
template <typename _Tp>
static true_type __test(const _Tp&,
decltype(__helper<const _Tp&>({}))* = 0);
static false_type __test(...);
};
template<typename _Tp>
struct __is_implicitly_default_constructible_impl
: public __do_is_implicitly_default_constructible_impl
{
typedef decltype(__test(declval<_Tp>())) type;
};
template<typename _Tp>
struct __is_implicitly_default_constructible_safe
: public __is_implicitly_default_constructible_impl<_Tp>::type
{ };
template <typename _Tp>
struct __is_implicitly_default_constructible
: public __and_<__is_constructible_impl<_Tp>,
__is_implicitly_default_constructible_safe<_Tp>>
{ };
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_trivially_copy_constructible_impl;
template<typename _Tp>
struct __is_trivially_copy_constructible_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_trivially_copy_constructible_impl<_Tp, true>
: public __and_<__is_copy_constructible_impl<_Tp>,
integral_constant<bool,
__is_trivially_constructible(_Tp, const _Tp&)>>
{ };
/// is_trivially_copy_constructible
template<typename _Tp>
struct is_trivially_copy_constructible
: public __is_trivially_copy_constructible_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_trivially_move_constructible_impl;
template<typename _Tp>
struct __is_trivially_move_constructible_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_trivially_move_constructible_impl<_Tp, true>
: public __and_<__is_move_constructible_impl<_Tp>,
integral_constant<bool,
__is_trivially_constructible(_Tp, _Tp&&)>>
{ };
/// is_trivially_move_constructible
template<typename _Tp>
struct is_trivially_move_constructible
: public __is_trivially_move_constructible_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_trivially_assignable
template<typename _Tp, typename _Up>
struct is_trivially_assignable
: public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_trivially_copy_assignable_impl;
template<typename _Tp>
struct __is_trivially_copy_assignable_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_trivially_copy_assignable_impl<_Tp, true>
: public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
{ };
/// is_trivially_copy_assignable
template<typename _Tp>
struct is_trivially_copy_assignable
: public __is_trivially_copy_assignable_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __is_trivially_move_assignable_impl;
template<typename _Tp>
struct __is_trivially_move_assignable_impl<_Tp, false>
: public false_type { };
template<typename _Tp>
struct __is_trivially_move_assignable_impl<_Tp, true>
: public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
{ };
/// is_trivially_move_assignable
template<typename _Tp>
struct is_trivially_move_assignable
: public __is_trivially_move_assignable_impl<_Tp>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// is_trivially_destructible
template<typename _Tp>
struct is_trivially_destructible
: public __and_<__is_destructible_safe<_Tp>,
__bool_constant<__has_trivial_destructor(_Tp)>>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// has_virtual_destructor
template<typename _Tp>
struct has_virtual_destructor
: public integral_constant<bool, __has_virtual_destructor(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
// type property queries.
/// alignment_of
template<typename _Tp>
struct alignment_of
: public integral_constant<std::size_t, alignof(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
"template argument must be a complete class or an unbounded array");
};
/// rank
template<typename>
struct rank
: public integral_constant<std::size_t, 0> { };
template<typename _Tp, std::size_t _Size>
struct rank<_Tp[_Size]>
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
template<typename _Tp>
struct rank<_Tp[]>
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
/// extent
template<typename, unsigned _Uint>
struct extent
: public integral_constant<std::size_t, 0> { };
template<typename _Tp, unsigned _Uint, std::size_t _Size>
struct extent<_Tp[_Size], _Uint>
: public integral_constant<std::size_t,
_Uint == 0 ? _Size : extent<_Tp,
_Uint - 1>::value>
{ };
template<typename _Tp, unsigned _Uint>
struct extent<_Tp[], _Uint>
: public integral_constant<std::size_t,
_Uint == 0 ? 0 : extent<_Tp,
_Uint - 1>::value>
{ };
// Type relations.
/// is_same
template<typename _Tp, typename _Up>
struct is_same
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME
: public integral_constant<bool, __is_same(_Tp, _Up)>
#else
: public false_type
#endif
{ };
#ifndef _GLIBCXX_HAVE_BUILTIN_IS_SAME
template<typename _Tp>
struct is_same<_Tp, _Tp>
: public true_type
{ };
#endif
/// is_base_of
template<typename _Base, typename _Derived>
struct is_base_of
: public integral_constant<bool, __is_base_of(_Base, _Derived)>
{ };
template<typename _From, typename _To,
bool = __or_<is_void<_From>, is_function<_To>,
is_array<_To>>::value>
struct __is_convertible_helper
{
typedef typename is_void<_To>::type type;
};
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
template<typename _From, typename _To>
class __is_convertible_helper<_From, _To, false>
{
template<typename _To1>
static void __test_aux(_To1) noexcept;
template<typename _From1, typename _To1,
typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
static true_type
__test(int);
template<typename, typename>
static false_type
__test(...);
public:
typedef decltype(__test<_From, _To>(0)) type;
};
#pragma GCC diagnostic pop
/// is_convertible
template<typename _From, typename _To>
struct is_convertible
: public __is_convertible_helper<_From, _To>::type
{ };
// helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N>
template<typename _ToElementType, typename _FromElementType>
using __is_array_convertible
= is_convertible<_FromElementType(*)[], _ToElementType(*)[]>;
template<typename _From, typename _To,
bool = __or_<is_void<_From>, is_function<_To>,
is_array<_To>>::value>
struct __is_nt_convertible_helper
: is_void<_To>
{ };
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
template<typename _From, typename _To>
class __is_nt_convertible_helper<_From, _To, false>
{
template<typename _To1>
static void __test_aux(_To1) noexcept;
template<typename _From1, typename _To1>
static
__bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
__test(int);
template<typename, typename>
static false_type
__test(...);
public:
using type = decltype(__test<_From, _To>(0));
};
#pragma GCC diagnostic pop
// is_nothrow_convertible for C++11
template<typename _From, typename _To>
struct __is_nothrow_convertible
: public __is_nt_convertible_helper<_From, _To>::type
{ };
#if __cplusplus > 201703L
#define __cpp_lib_is_nothrow_convertible 201806L
/// is_nothrow_convertible
template<typename _From, typename _To>
struct is_nothrow_convertible
: public __is_nt_convertible_helper<_From, _To>::type
{ };
/// is_nothrow_convertible_v
template<typename _From, typename _To>
inline constexpr bool is_nothrow_convertible_v
= is_nothrow_convertible<_From, _To>::value;
#endif // C++2a
// Const-volatile modifications.
/// remove_const
template<typename _Tp>
struct remove_const
{ typedef _Tp type; };
template<typename _Tp>
struct remove_const<_Tp const>
{ typedef _Tp type; };
/// remove_volatile
template<typename _Tp>
struct remove_volatile
{ typedef _Tp type; };
template<typename _Tp>
struct remove_volatile<_Tp volatile>
{ typedef _Tp type; };
/// remove_cv
template<typename _Tp>
struct remove_cv
{ using type = _Tp; };
template<typename _Tp>
struct remove_cv<const _Tp>
{ using type = _Tp; };
template<typename _Tp>
struct remove_cv<volatile _Tp>
{ using type = _Tp; };
template<typename _Tp>
struct remove_cv<const volatile _Tp>
{ using type = _Tp; };
/// add_const
template<typename _Tp>
struct add_const
{ typedef _Tp const type; };
/// add_volatile
template<typename _Tp>
struct add_volatile
{ typedef _Tp volatile type; };
/// add_cv
template<typename _Tp>
struct add_cv
{
typedef typename
add_const<typename add_volatile<_Tp>::type>::type type;
};
#if __cplusplus > 201103L
#define __cpp_lib_transformation_trait_aliases 201304
/// Alias template for remove_const
template<typename _Tp>
using remove_const_t = typename remove_const<_Tp>::type;
/// Alias template for remove_volatile
template<typename _Tp>
using remove_volatile_t = typename remove_volatile<_Tp>::type;
/// Alias template for remove_cv
template<typename _Tp>
using remove_cv_t = typename remove_cv<_Tp>::type;
/// Alias template for add_const
template<typename _Tp>
using add_const_t = typename add_const<_Tp>::type;
/// Alias template for add_volatile
template<typename _Tp>
using add_volatile_t = typename add_volatile<_Tp>::type;
/// Alias template for add_cv
template<typename _Tp>
using add_cv_t = typename add_cv<_Tp>::type;
#endif
// Reference transformations.
/// remove_reference
template<typename _Tp>
struct remove_reference
{ typedef _Tp type; };
template<typename _Tp>
struct remove_reference<_Tp&>
{ typedef _Tp type; };
template<typename _Tp>
struct remove_reference<_Tp&&>
{ typedef _Tp type; };
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __add_lvalue_reference_helper
{ typedef _Tp type; };
template<typename _Tp>
struct __add_lvalue_reference_helper<_Tp, true>
{ typedef _Tp& type; };
/// add_lvalue_reference
template<typename _Tp>
struct add_lvalue_reference
: public __add_lvalue_reference_helper<_Tp>
{ };
template<typename _Tp, bool = __is_referenceable<_Tp>::value>
struct __add_rvalue_reference_helper
{ typedef _Tp type; };
template<typename _Tp>
struct __add_rvalue_reference_helper<_Tp, true>
{ typedef _Tp&& type; };
/// add_rvalue_reference
template<typename _Tp>
struct add_rvalue_reference
: public __add_rvalue_reference_helper<_Tp>
{ };
#if __cplusplus > 201103L
/// Alias template for remove_reference
template<typename _Tp>
using remove_reference_t = typename remove_reference<_Tp>::type;
/// Alias template for add_lvalue_reference
template<typename _Tp>
using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
/// Alias template for add_rvalue_reference
template<typename _Tp>
using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
#endif
// Sign modifications.
/// @cond undocumented
// Utility for constructing identically cv-qualified types.
template<typename _Unqualified, bool _IsConst, bool _IsVol>
struct __cv_selector;
template<typename _Unqualified>
struct __cv_selector<_Unqualified, false, false>
{ typedef _Unqualified __type; };
template<typename _Unqualified>
struct __cv_selector<_Unqualified, false, true>
{ typedef volatile _Unqualified __type; };
template<typename _Unqualified>
struct __cv_selector<_Unqualified, true, false>
{ typedef const _Unqualified __type; };
template<typename _Unqualified>
struct __cv_selector<_Unqualified, true, true>
{ typedef const volatile _Unqualified __type; };
template<typename _Qualified, typename _Unqualified,
bool _IsConst = is_const<_Qualified>::value,
bool _IsVol = is_volatile<_Qualified>::value>
class __match_cv_qualifiers
{
typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
public:
typedef typename __match::__type __type;
};
// Utility for finding the unsigned versions of signed integral types.
template<typename _Tp>
struct __make_unsigned
{ typedef _Tp __type; };
template<>
struct __make_unsigned<char>
{ typedef unsigned char __type; };
template<>
struct __make_unsigned<signed char>
{ typedef unsigned char __type; };
template<>
struct __make_unsigned<short>
{ typedef unsigned short __type; };
template<>
struct __make_unsigned<int>
{ typedef unsigned int __type; };
template<>
struct __make_unsigned<long>
{ typedef unsigned long __type; };
template<>
struct __make_unsigned<long long>
{ typedef unsigned long long __type; };
#if defined(__GLIBCXX_TYPE_INT_N_0)
__extension__
template<>
struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
{ typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
__extension__
template<>
struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
{ typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
__extension__
template<>
struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
{ typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_3)
__extension__
template<>
struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
{ typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
#endif
// Select between integral and enum: not possible to be both.
template<typename _Tp,
bool _IsInt = is_integral<_Tp>::value,
bool _IsEnum = is_enum<_Tp>::value>
class __make_unsigned_selector;
template<typename _Tp>
class __make_unsigned_selector<_Tp, true, false>
{
using __unsigned_type
= typename __make_unsigned<__remove_cv_t<_Tp>>::__type;
public:
using __type
= typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
};
class __make_unsigned_selector_base
{
protected:
template<typename...> struct _List { };
template<typename _Tp, typename... _Up>
struct _List<_Tp, _Up...> : _List<_Up...>
{ static constexpr size_t __size = sizeof(_Tp); };
template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
struct __select;
template<size_t _Sz, typename _Uint, typename... _UInts>
struct __select<_Sz, _List<_Uint, _UInts...>, true>
{ using __type = _Uint; };
template<size_t _Sz, typename _Uint, typename... _UInts>
struct __select<_Sz, _List<_Uint, _UInts...>, false>
: __select<_Sz, _List<_UInts...>>
{ };
};
// Choose unsigned integer type with the smallest rank and same size as _Tp
template<typename _Tp>
class __make_unsigned_selector<_Tp, false, true>
: __make_unsigned_selector_base
{
// With -fshort-enums, an enum may be as small as a char.
using _UInts = _List<unsigned char, unsigned short, unsigned int,
unsigned long, unsigned long long>;
using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
public:
using __type
= typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
};
// wchar_t, char8_t, char16_t and char32_t are integral types but are
// neither signed integer types nor unsigned integer types, so must be
// transformed to the unsigned integer type with the smallest rank.
// Use the partial specialization for enumeration types to do that.
template<>
struct __make_unsigned<wchar_t>
{
using __type
= typename __make_unsigned_selector<wchar_t, false, true>::__type;
};
#ifdef _GLIBCXX_USE_CHAR8_T
template<>
struct __make_unsigned<char8_t>
{
using __type
= typename __make_unsigned_selector<char8_t, false, true>::__type;
};
#endif
template<>
struct __make_unsigned<char16_t>
{
using __type
= typename __make_unsigned_selector<char16_t, false, true>::__type;
};
template<>
struct __make_unsigned<char32_t>
{
using __type
= typename __make_unsigned_selector<char32_t, false, true>::__type;
};
/// @endcond
// Given an integral/enum type, return the corresponding unsigned
// integer type.
// Primary template.
/// make_unsigned
template<typename _Tp>
struct make_unsigned
{ typedef typename __make_unsigned_selector<_Tp>::__type type; };
// Integral, but don't define.
template<>
struct make_unsigned<bool>;
/// @cond undocumented
// Utility for finding the signed versions of unsigned integral types.
template<typename _Tp>
struct __make_signed
{ typedef _Tp __type; };
template<>
struct __make_signed<char>
{ typedef signed char __type; };
template<>
struct __make_signed<unsigned char>
{ typedef signed char __type; };
template<>
struct __make_signed<unsigned short>
{ typedef signed short __type; };
template<>
struct __make_signed<unsigned int>
{ typedef signed int __type; };
template<>
struct __make_signed<unsigned long>
{ typedef signed long __type; };
template<>
struct __make_signed<unsigned long long>
{ typedef signed long long __type; };
#if defined(__GLIBCXX_TYPE_INT_N_0)
__extension__
template<>
struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
{ typedef __GLIBCXX_TYPE_INT_N_0 __type; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
__extension__
template<>
struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
{ typedef __GLIBCXX_TYPE_INT_N_1 __type; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
__extension__
template<>
struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
{ typedef __GLIBCXX_TYPE_INT_N_2 __type; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_3)
__extension__
template<>
struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
{ typedef __GLIBCXX_TYPE_INT_N_3 __type; };
#endif
// Select between integral and enum: not possible to be both.
template<typename _Tp,
bool _IsInt = is_integral<_Tp>::value,
bool _IsEnum = is_enum<_Tp>::value>
class __make_signed_selector;
template<typename _Tp>
class __make_signed_selector<_Tp, true, false>
{
using __signed_type
= typename __make_signed<__remove_cv_t<_Tp>>::__type;
public:
using __type
= typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
};
// Choose signed integer type with the smallest rank and same size as _Tp
template<typename _Tp>
class __make_signed_selector<_Tp, false, true>
{
typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
public:
typedef typename __make_signed_selector<__unsigned_type>::__type __type;
};
// wchar_t, char16_t and char32_t are integral types but are neither
// signed integer types nor unsigned integer types, so must be
// transformed to the signed integer type with the smallest rank.
// Use the partial specialization for enumeration types to do that.
template<>
struct __make_signed<wchar_t>
{
using __type
= typename __make_signed_selector<wchar_t, false, true>::__type;
};
#if defined(_GLIBCXX_USE_CHAR8_T)
template<>
struct __make_signed<char8_t>
{
using __type
= typename __make_signed_selector<char8_t, false, true>::__type;
};
#endif
template<>
struct __make_signed<char16_t>
{
using __type
= typename __make_signed_selector<char16_t, false, true>::__type;
};
template<>
struct __make_signed<char32_t>
{
using __type
= typename __make_signed_selector<char32_t, false, true>::__type;
};
/// @endcond
// Given an integral/enum type, return the corresponding signed
// integer type.
// Primary template.
/// make_signed
template<typename _Tp>
struct make_signed
{ typedef typename __make_signed_selector<_Tp>::__type type; };
// Integral, but don't define.
template<>
struct make_signed<bool>;
#if __cplusplus > 201103L
/// Alias template for make_signed
template<typename _Tp>
using make_signed_t = typename make_signed<_Tp>::type;
/// Alias template for make_unsigned
template<typename _Tp>
using make_unsigned_t = typename make_unsigned<_Tp>::type;
#endif
// Array modifications.
/// remove_extent
template<typename _Tp>
struct remove_extent
{ typedef _Tp type; };
template<typename _Tp, std::size_t _Size>
struct remove_extent<_Tp[_Size]>
{ typedef _Tp type; };
template<typename _Tp>
struct remove_extent<_Tp[]>
{ typedef _Tp type; };
/// remove_all_extents
template<typename _Tp>
struct remove_all_extents
{ typedef _Tp type; };
template<typename _Tp, std::size_t _Size>
struct remove_all_extents<_Tp[_Size]>
{ typedef typename remove_all_extents<_Tp>::type type; };
template<typename _Tp>
struct remove_all_extents<_Tp[]>
{ typedef typename remove_all_extents<_Tp>::type type; };
#if __cplusplus > 201103L
/// Alias template for remove_extent
template<typename _Tp>
using remove_extent_t = typename remove_extent<_Tp>::type;
/// Alias template for remove_all_extents
template<typename _Tp>
using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
#endif
// Pointer modifications.
template<typename _Tp, typename>
struct __remove_pointer_helper
{ typedef _Tp type; };
template<typename _Tp, typename _Up>
struct __remove_pointer_helper<_Tp, _Up*>
{ typedef _Up type; };
/// remove_pointer
template<typename _Tp>
struct remove_pointer
: public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>>
{ };
template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
is_void<_Tp>>::value>
struct __add_pointer_helper
{ typedef _Tp type; };
template<typename _Tp>
struct __add_pointer_helper<_Tp, true>
{ typedef typename remove_reference<_Tp>::type* type; };
/// add_pointer
template<typename _Tp>
struct add_pointer
: public __add_pointer_helper<_Tp>
{ };
#if __cplusplus > 201103L
/// Alias template for remove_pointer
template<typename _Tp>
using remove_pointer_t = typename remove_pointer<_Tp>::type;
/// Alias template for add_pointer
template<typename _Tp>
using add_pointer_t = typename add_pointer<_Tp>::type;
#endif
template<std::size_t _Len>
struct __aligned_storage_msa
{
union __type
{
unsigned char __data[_Len];
struct __attribute__((__aligned__)) { } __align;
};
};
/**
* @brief Alignment type.
*
* The value of _Align is a default-alignment which shall be the
* most stringent alignment requirement for any C++ object type
* whose size is no greater than _Len (3.9). The member typedef
* type shall be a POD type suitable for use as uninitialized
* storage for any object whose size is at most _Len and whose
* alignment is a divisor of _Align.
*/
template<std::size_t _Len, std::size_t _Align =
__alignof__(typename __aligned_storage_msa<_Len>::__type)>
struct aligned_storage
{
union type
{
unsigned char __data[_Len];
struct __attribute__((__aligned__((_Align)))) { } __align;
};
};
template <typename... _Types>
struct __strictest_alignment
{
static const size_t _S_alignment = 0;
static const size_t _S_size = 0;
};
template <typename _Tp, typename... _Types>
struct __strictest_alignment<_Tp, _Types...>
{
static const size_t _S_alignment =
alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
static const size_t _S_size =
sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
};
/**
* @brief Provide aligned storage for types.
*
* [meta.trans.other]
*
* Provides aligned storage for any of the provided types of at
* least size _Len.
*
* @see aligned_storage
*/
template <size_t _Len, typename... _Types>
struct aligned_union
{
private:
static_assert(sizeof...(_Types) != 0, "At least one type is required");
using __strictest = __strictest_alignment<_Types...>;
static const size_t _S_len = _Len > __strictest::_S_size
? _Len : __strictest::_S_size;
public:
/// The value of the strictest alignment of _Types.
static const size_t alignment_value = __strictest::_S_alignment;
/// The storage.
typedef typename aligned_storage<_S_len, alignment_value>::type type;
};
template <size_t _Len, typename... _Types>
const size_t aligned_union<_Len, _Types...>::alignment_value;
/// @cond undocumented
// Decay trait for arrays and functions, used for perfect forwarding
// in make_pair, make_tuple, etc.
template<typename _Up,
bool _IsArray = is_array<_Up>::value,
bool _IsFunction = is_function<_Up>::value>
struct __decay_selector;
// NB: DR 705.
template<typename _Up>
struct __decay_selector<_Up, false, false>
{ typedef __remove_cv_t<_Up> __type; };
template<typename _Up>
struct __decay_selector<_Up, true, false>
{ typedef typename remove_extent<_Up>::type* __type; };
template<typename _Up>
struct __decay_selector<_Up, false, true>
{ typedef typename add_pointer<_Up>::type __type; };
/// @endcond
/// decay
template<typename _Tp>
class decay
{
typedef typename remove_reference<_Tp>::type __remove_type;
public:
typedef typename __decay_selector<__remove_type>::__type type;
};
/// @cond undocumented
// Helper which adds a reference to a type when given a reference_wrapper
template<typename _Tp>
struct __strip_reference_wrapper
{
typedef _Tp __type;
};
template<typename _Tp>
struct __strip_reference_wrapper<reference_wrapper<_Tp> >
{
typedef _Tp& __type;
};
// __decay_t (std::decay_t for C++11).
template<typename _Tp>
using __decay_t = typename decay<_Tp>::type;
template<typename _Tp>
using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>;
/// @endcond
// Primary template.
/// Define a member typedef `type` only if a boolean constant is true.
template<bool, typename _Tp = void>
struct enable_if
{ };
// Partial specialization for true.
template<typename _Tp>
struct enable_if<true, _Tp>
{ typedef _Tp type; };
/// @cond undocumented
// __enable_if_t (std::enable_if_t for C++11)
template<bool _Cond, typename _Tp = void>
using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
// Helper for SFINAE constraints
template<typename... _Cond>
using _Require = __enable_if_t<__and_<_Cond...>::value>;
// __remove_cvref_t (std::remove_cvref_t for C++11).
template<typename _Tp>
using __remove_cvref_t
= typename remove_cv<typename remove_reference<_Tp>::type>::type;
/// @endcond
// Primary template.
/// Define a member typedef @c type to one of two argument types.
template<bool _Cond, typename _Iftrue, typename _Iffalse>
struct conditional
{ typedef _Iftrue type; };
// Partial specialization for false.
template<typename _Iftrue, typename _Iffalse>
struct conditional<false, _Iftrue, _Iffalse>
{ typedef _Iffalse type; };
/// common_type
template<typename... _Tp>
struct common_type;
// Sfinae-friendly common_type implementation:
/// @cond undocumented
struct __do_common_type_impl
{
template<typename _Tp, typename _Up>
using __cond_t
= decltype(true ? std::declval<_Tp>() : std::declval<_Up>());
// if decay_t<decltype(false ? declval<D1>() : declval<D2>())>
// denotes a valid type, let C denote that type.
template<typename _Tp, typename _Up>
static __success_type<__decay_t<__cond_t<_Tp, _Up>>>
_S_test(int);
#if __cplusplus > 201703L
// Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type,
// let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>.
template<typename _Tp, typename _Up>
static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>>
_S_test_2(int);
#endif
template<typename, typename>
static __failure_type
_S_test_2(...);
template<typename _Tp, typename _Up>
static decltype(_S_test_2<_Tp, _Up>(0))
_S_test(...);
};
// If sizeof...(T) is zero, there shall be no member type.
template<>
struct common_type<>
{ };
// If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>.
template<typename _Tp0>
struct common_type<_Tp0>
: public common_type<_Tp0, _Tp0>
{ };
// If sizeof...(T) is two, ...
template<typename _Tp1, typename _Tp2,
typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>>
struct __common_type_impl
{
// If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false,
// let C denote the same type, if any, as common_type_t<D1, D2>.
using type = common_type<_Dp1, _Dp2>;
};
template<typename _Tp1, typename _Tp2>
struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2>
: private __do_common_type_impl
{
// Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())>
// denotes a valid type, let C denote that type.
using type = decltype(_S_test<_Tp1, _Tp2>(0));
};
// If sizeof...(T) is two, ...
template<typename _Tp1, typename _Tp2>
struct common_type<_Tp1, _Tp2>
: public __common_type_impl<_Tp1, _Tp2>::type
{ };
template<typename...>
struct __common_type_pack
{ };
template<typename, typename, typename = void>
struct __common_type_fold;
// If sizeof...(T) is greater than two, ...
template<typename _Tp1, typename _Tp2, typename... _Rp>
struct common_type<_Tp1, _Tp2, _Rp...>
: public __common_type_fold<common_type<_Tp1, _Tp2>,
__common_type_pack<_Rp...>>
{ };
// Let C denote the same type, if any, as common_type_t<T1, T2>.
// If there is such a type C, type shall denote the same type, if any,
// as common_type_t<C, R...>.
template<typename _CTp, typename... _Rp>
struct __common_type_fold<_CTp, __common_type_pack<_Rp...>,
__void_t<typename _CTp::type>>
: public common_type<typename _CTp::type, _Rp...>
{ };
// Otherwise, there shall be no member type.
template<typename _CTp, typename _Rp>
struct __common_type_fold<_CTp, _Rp, void>
{ };
template<typename _Tp, bool = is_enum<_Tp>::value>
struct __underlying_type_impl
{
using type = __underlying_type(_Tp);
};
template<typename _Tp>
struct __underlying_type_impl<_Tp, false>
{ };
/// @endcond
/// The underlying type of an enum.
template<typename _Tp>
struct underlying_type
: public __underlying_type_impl<_Tp>
{ };
/// @cond undocumented
template<typename _Tp>
struct __declval_protector
{
static const bool __stop = false;
};
/// @endcond
/** Utility to simplify expressions used in unevaluated operands
* @since C++11
* @ingroup utilities
*/
template<typename _Tp>
auto declval() noexcept -> decltype(__declval<_Tp>(0))
{
static_assert(__declval_protector<_Tp>::__stop,
"declval() must not be used!");
return __declval<_Tp>(0);
}
/// result_of
template<typename _Signature>
struct result_of;
// Sfinae-friendly result_of implementation:
#define __cpp_lib_result_of_sfinae 201210
/// @cond undocumented
struct __invoke_memfun_ref { };
struct __invoke_memfun_deref { };
struct __invoke_memobj_ref { };
struct __invoke_memobj_deref { };
struct __invoke_other { };
// Associate a tag type with a specialization of __success_type.
template<typename _Tp, typename _Tag>
struct __result_of_success : __success_type<_Tp>
{ using __invoke_type = _Tag; };
// [func.require] paragraph 1 bullet 1:
struct __result_of_memfun_ref_impl
{
template<typename _Fp, typename _Tp1, typename... _Args>
static __result_of_success<decltype(
(std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
), __invoke_memfun_ref> _S_test(int);
template<typename...>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_memfun_ref
: private __result_of_memfun_ref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
};
// [func.require] paragraph 1 bullet 2:
struct __result_of_memfun_deref_impl
{
template<typename _Fp, typename _Tp1, typename... _Args>
static __result_of_success<decltype(
((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
), __invoke_memfun_deref> _S_test(int);
template<typename...>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_memfun_deref
: private __result_of_memfun_deref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
};
// [func.require] paragraph 1 bullet 3:
struct __result_of_memobj_ref_impl
{
template<typename _Fp, typename _Tp1>
static __result_of_success<decltype(
std::declval<_Tp1>().*std::declval<_Fp>()
), __invoke_memobj_ref> _S_test(int);
template<typename, typename>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg>
struct __result_of_memobj_ref
: private __result_of_memobj_ref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
};
// [func.require] paragraph 1 bullet 4:
struct __result_of_memobj_deref_impl
{
template<typename _Fp, typename _Tp1>
static __result_of_success<decltype(
(*std::declval<_Tp1>()).*std::declval<_Fp>()
), __invoke_memobj_deref> _S_test(int);
template<typename, typename>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg>
struct __result_of_memobj_deref
: private __result_of_memobj_deref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
};
template<typename _MemPtr, typename _Arg>
struct __result_of_memobj;
template<typename _Res, typename _Class, typename _Arg>
struct __result_of_memobj<_Res _Class::*, _Arg>
{
typedef __remove_cvref_t<_Arg> _Argval;
typedef _Res _Class::* _MemPtr;
typedef typename __conditional_t<__or_<is_same<_Argval, _Class>,
is_base_of<_Class, _Argval>>::value,
__result_of_memobj_ref<_MemPtr, _Arg>,
__result_of_memobj_deref<_MemPtr, _Arg>
>::type type;
};
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_memfun;
template<typename _Res, typename _Class, typename _Arg, typename... _Args>
struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
{
typedef typename remove_reference<_Arg>::type _Argval;
typedef _Res _Class::* _MemPtr;
typedef typename __conditional_t<is_base_of<_Class, _Argval>::value,
__result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
__result_of_memfun_deref<_MemPtr, _Arg, _Args...>
>::type type;
};
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2219. INVOKE-ing a pointer to member with a reference_wrapper
// as the object expression
// Used by result_of, invoke etc. to unwrap a reference_wrapper.
template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
struct __inv_unwrap
{
using type = _Tp;
};
template<typename _Tp, typename _Up>
struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
{
using type = _Up&;
};
template<bool, bool, typename _Functor, typename... _ArgTypes>
struct __result_of_impl
{
typedef __failure_type type;
};
template<typename _MemPtr, typename _Arg>
struct __result_of_impl<true, false, _MemPtr, _Arg>
: public __result_of_memobj<__decay_t<_MemPtr>,
typename __inv_unwrap<_Arg>::type>
{ };
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
: public __result_of_memfun<__decay_t<_MemPtr>,
typename __inv_unwrap<_Arg>::type, _Args...>
{ };
// [func.require] paragraph 1 bullet 5:
struct __result_of_other_impl
{
template<typename _Fn, typename... _Args>
static __result_of_success<decltype(
std::declval<_Fn>()(std::declval<_Args>()...)
), __invoke_other> _S_test(int);
template<typename...>
static __failure_type _S_test(...);
};
template<typename _Functor, typename... _ArgTypes>
struct __result_of_impl<false, false, _Functor, _ArgTypes...>
: private __result_of_other_impl
{
typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
};
// __invoke_result (std::invoke_result for C++11)
template<typename _Functor, typename... _ArgTypes>
struct __invoke_result
: public __result_of_impl<
is_member_object_pointer<
typename remove_reference<_Functor>::type
>::value,
is_member_function_pointer<
typename remove_reference<_Functor>::type
>::value,
_Functor, _ArgTypes...
>::type
{ };
/// @endcond
template<typename _Functor, typename... _ArgTypes>
struct result_of<_Functor(_ArgTypes...)>
: public __invoke_result<_Functor, _ArgTypes...>
{ };
#if __cplusplus >= 201402L
/// Alias template for aligned_storage
template<size_t _Len, size_t _Align =
__alignof__(typename __aligned_storage_msa<_Len>::__type)>
using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
template <size_t _Len, typename... _Types>
using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
/// Alias template for decay
template<typename _Tp>
using decay_t = typename decay<_Tp>::type;
/// Alias template for enable_if
template<bool _Cond, typename _Tp = void>
using enable_if_t = typename enable_if<_Cond, _Tp>::type;
/// Alias template for conditional
template<bool _Cond, typename _Iftrue, typename _Iffalse>
using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
/// Alias template for common_type
template<typename... _Tp>
using common_type_t = typename common_type<_Tp...>::type;
/// Alias template for underlying_type
template<typename _Tp>
using underlying_type_t = typename underlying_type<_Tp>::type;
/// Alias template for result_of
template<typename _Tp>
using result_of_t = typename result_of<_Tp>::type;
#endif // C++14
#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
#define __cpp_lib_void_t 201411
/// A metafunction that always yields void, used for detecting valid types.
template<typename...> using void_t = void;
#endif
/// @cond undocumented
/// Implementation of the detection idiom (negative case).
template<typename _Default, typename _AlwaysVoid,
template<typename...> class _Op, typename... _Args>
struct __detector
{
using value_t = false_type;
using type = _Default;
};
/// Implementation of the detection idiom (positive case).
template<typename _Default, template<typename...> class _Op,
typename... _Args>
struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
{
using value_t = true_type;
using type = _Op<_Args...>;
};
// Detect whether _Op<_Args...> is a valid type, use _Default if not.
template<typename _Default, template<typename...> class _Op,
typename... _Args>
using __detected_or = __detector<_Default, void, _Op, _Args...>;
// _Op<_Args...> if that is a valid type, otherwise _Default.
template<typename _Default, template<typename...> class _Op,
typename... _Args>
using __detected_or_t
= typename __detected_or<_Default, _Op, _Args...>::type;
/**
* Use SFINAE to determine if the type _Tp has a publicly-accessible
* member type _NTYPE.
*/
#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
template<typename _Tp, typename = __void_t<>> \
struct __has_##_NTYPE \
: false_type \
{ }; \
template<typename _Tp> \
struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
: true_type \
{ };
template <typename _Tp>
struct __is_swappable;
template <typename _Tp>
struct __is_nothrow_swappable;
template<typename>
struct __is_tuple_like_impl : false_type
{ };
// Internal type trait that allows us to sfinae-protect tuple_cat.
template<typename _Tp>
struct __is_tuple_like
: public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
{ };
/// @endcond
template<typename _Tp>
_GLIBCXX20_CONSTEXPR
inline
_Require<__not_<__is_tuple_like<_Tp>>,
is_move_constructible<_Tp>,
is_move_assignable<_Tp>>
swap(_Tp&, _Tp&)
noexcept(__and_<is_nothrow_move_constructible<_Tp>,
is_nothrow_move_assignable<_Tp>>::value);
template<typename _Tp, size_t _Nm>
_GLIBCXX20_CONSTEXPR
inline
__enable_if_t<__is_swappable<_Tp>::value>
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(__is_nothrow_swappable<_Tp>::value);
/// @cond undocumented
namespace __swappable_details {
using std::swap;
struct __do_is_swappable_impl
{
template<typename _Tp, typename
= decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
static true_type __test(int);
template<typename>
static false_type __test(...);
};
struct __do_is_nothrow_swappable_impl
{
template<typename _Tp>
static __bool_constant<
noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
> __test(int);
template<typename>
static false_type __test(...);
};
} // namespace __swappable_details
template<typename _Tp>
struct __is_swappable_impl
: public __swappable_details::__do_is_swappable_impl
{
typedef decltype(__test<_Tp>(0)) type;
};