// C++11 <type_traits> -*- C++ -*- // Copyright (C) 2007-2020 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 /** * @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. * * @{ */ /// 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 }; template<typename _Tp, _Tp __v> constexpr _Tp integral_constant<_Tp, __v>::value; /// The type used as a compile-time boolean with true value. typedef integral_constant<bool, true> true_type; /// The type used as a compile-time boolean with false value. typedef integral_constant<bool, false> false_type; template<bool __v> using __bool_constant = integral_constant<bool, __v>; #if __cplusplus > 201402L # define __cpp_lib_bool_constant 201505 template<bool __v> using bool_constant = integral_constant<bool, __v>; #endif // Meta programming helper types. template<bool, typename, typename> struct conditional; 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<_B1::value, _B1, _B2>::type { }; template<typename _B1, typename _B2, typename _B3, typename... _Bn> struct __or_<_B1, _B2, _B3, _Bn...> : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type { }; 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<_B1::value, _B2, _B1>::type { }; template<typename _B1, typename _B2, typename _B3, typename... _Bn> struct __and_<_B1, _B2, _B3, _Bn...> : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type { }; template<typename _Pp> struct __not_ : public __bool_constant<!bool(_Pp::value)> { }; #if __cplusplus >= 201703L template<typename... _Bn> inline constexpr bool __or_v = __or_<_Bn...>::value; template<typename... _Bn> inline constexpr bool __and_v = __and_<_Bn...>::value; #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> { }; 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 __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 { }; template<typename> struct remove_cv; // __remove_cv_t (std::remove_cv_t for C++11). template<typename _Tp> using __remove_cv_t = typename remove_cv<_Tp>::type; template<typename> struct is_const; // Primary type categories. template<typename> struct __is_void_helper : public false_type { }; template<> struct __is_void_helper<void> : public true_type { }; /// is_void template<typename _Tp> struct is_void : public __is_void_helper<__remove_cv_t<_Tp>>::type { }; 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 { }; #ifdef _GLIBCXX_USE_WCHAR_T template<> struct __is_integral_helper<wchar_t> : public true_type { }; #endif #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) template<> struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> : public true_type { }; template<> struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> : public true_type { }; #endif #if defined(__GLIBCXX_TYPE_INT_N_1) template<> struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> : public true_type { }; template<> struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> : public true_type { }; #endif #if defined(__GLIBCXX_TYPE_INT_N_2) template<> struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> : public true_type { }; template<> struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> : public true_type { }; #endif #if defined(__GLIBCXX_TYPE_INT_N_3) template<> struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> : public true_type { }; template<> struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> : public true_type { }; #endif /// is_integral template<typename _Tp> struct is_integral : public __is_integral_helper<__remove_cv_t<_Tp>>::type { }; 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) && !defined(__CUDACC__) template<> struct __is_floating_point_helper<__float128> : public true_type { }; #endif /// 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). 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 { }; 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 { }; /// 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; 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. 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. 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 { }; // 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 in C++20) // 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 template<typename _Tp> struct 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 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)> { }; 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)> { }; /// 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>>> { }; // Destructible and constructible type properties. /** * @brief Utility to simplify expressions used in unevaluated operands * @ingroup utilities */ template<typename _Tp, typename _Up = _Tp&&> _Up __declval(int); template<typename _Tp> _Tp __declval(long); template<typename _Tp> auto declval() noexcept -> decltype(__declval<_Tp>(0)); template<typename, unsigned = 0> struct extent; template<typename> struct remove_all_extents; 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>>> { }; // 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 { }; /// 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"); }; // 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 { }; /// 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"); }; template<typename _Tp, typename... _Args> struct __is_constructible_impl : public __bool_constant<__is_constructible(_Tp, _Args...)> { }; /// 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"); }; 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&> { }; /// 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"); }; 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&&> { }; /// 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"); }; template<bool, typename _Tp, typename... _Args> struct __is_nt_constructible_impl : public false_type { }; template<typename _Tp, typename... _Args> struct __is_nt_constructible_impl<true, _Tp, _Args...> : public __bool_constant<noexcept(_Tp(std::declval<_Args>()...))> { }; template<typename _Tp, typename _Arg> struct __is_nt_constructible_impl<true, _Tp, _Arg> : public __bool_constant<noexcept(static_cast<_Tp>(std::declval<_Arg>()))> { }; template<typename _Tp> struct __is_nt_constructible_impl<true, _Tp> : public __bool_constant<noexcept(_Tp())> { }; template<typename _Tp, size_t _Num> struct __is_nt_constructible_impl<true, _Tp[_Num]> : public __bool_constant<noexcept(typename remove_all_extents<_Tp>::type())> { }; #if __cpp_aggregate_paren_init template<typename _Tp, size_t _Num, typename _Arg> struct __is_nt_constructible_impl<true, _Tp[_Num], _Arg> : public __is_nt_constructible_impl<true, _Tp, _Arg> { }; template<typename _Tp, size_t _Num, typename... _Args> struct __is_nt_constructible_impl<true, _Tp[_Num], _Args...> : public __and_<__is_nt_constructible_impl<true, _Tp, _Args>...> { }; #endif template<typename _Tp, typename... _Args> using __is_nothrow_constructible_impl = __is_nt_constructible_impl<__is_constructible(_Tp, _Args...), _Tp, _Args...>; /// 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 __is_nothrow_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"); }; 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&> { }; /// 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"); }; 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&&> { }; /// 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> struct __is_nt_assignable_impl : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())> { }; template<typename _Tp, typename _Up> struct __is_nothrow_assignable_impl : public __and_<__bool_constant<__is_assignable(_Tp, _Up)>, __is_nt_assignable_impl<_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_BUILTIN_IS_SAME_AS : public integral_constant<bool, _GLIBCXX_BUILTIN_IS_SAME_AS(_Tp, _Up)> #else : public false_type #endif { }; #ifndef _GLIBCXX_BUILTIN_IS_SAME_AS 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. // 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) 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) 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) 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) 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. #if defined(_GLIBCXX_USE_WCHAR_T) template<> struct __make_unsigned<wchar_t> { using __type = typename __make_unsigned_selector<wchar_t, false, true>::__type; }; #endif #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; }; // 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>; // 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) 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) 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) 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) 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. #if defined(_GLIBCXX_USE_WCHAR_T) template<> struct __make_signed<wchar_t> { using __type = typename __make_signed_selector<wchar_t, false, true>::__type; }; #endif #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; }; // 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>> { }; /// add_pointer 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; }; 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; // 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; }; /// decay template<typename _Tp> class decay { typedef typename remove_reference<_Tp>::type __remove_type; public: typedef typename __decay_selector<__remove_type>::__type type; }; // __decay_t (std::decay_t for C++11). template<typename _Tp> using __decay_t = typename decay<_Tp>::type; template<typename _Tp> class reference_wrapper; // 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; }; template<typename _Tp> using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>; // Primary template. /// Define a member typedef @c 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; }; // __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; template<typename... _Cond> using _Require = __enable_if_t<__and_<_Cond...>::value>; // 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; }; // __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; /// common_type template<typename... _Tp> struct common_type; // Sfinae-friendly common_type implementation: 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> { }; /// The underlying type of an enum. template<typename _Tp> struct underlying_type : public __underlying_type_impl<_Tp> { }; template<typename _Tp> struct __declval_protector { static const bool __stop = false; }; 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> class result_of; // Sfinae-friendly result_of implementation: #define __cpp_lib_result_of_sfinae 201210 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<__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 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<is_base_of<_Class, _Argval>::value, __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, __result_of_memfun_deref<_MemPtr, _Arg, _Args...> >::type::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 { }; 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 /// 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; /// @} group metaprogramming /** * 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... _Elements> class tuple; template<typename> struct __is_tuple_like_impl : false_type { }; template<typename... _Tps> struct __is_tuple_like_impl<tuple<_Tps...>> : true_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 { }; 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); 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; }; template<typename _Tp> struct __is_nothrow_swappable_impl : public __swappable_details::__do_is_nothrow_swappable_impl { typedef decltype(__test<_Tp>(0)) type; }; template<typename _Tp> struct __is_swappable : public __is_swappable_impl<_Tp>::type { }; template<typename _Tp> struct __is_nothrow_swappable : public __is_nothrow_swappable_impl<_Tp>::type { }; #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 #define __cpp_lib_is_swappable 201603 /// Metafunctions used for detecting swappable types: p0185r1 /// is_swappable template<typename _Tp> struct is_swappable : public __is_swappable_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_nothrow_swappable template<typename _Tp> struct is_nothrow_swappable : public __is_nothrow_swappable_impl<_Tp>::type { static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), "template argument must be a complete class or an unbounded array"); }; #if __cplusplus >= 201402L /// is_swappable_v template<typename _Tp> _GLIBCXX17_INLINE constexpr bool is_swappable_v = is_swappable<_Tp>::value; /// is_nothrow_swappable_v template<typename _Tp> _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; #endif // __cplusplus >= 201402L namespace __swappable_with_details { using std::swap; struct __do_is_swappable_with_impl { template<typename _Tp, typename _Up, typename = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), typename = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> static true_type __test(int); template<typename, typename> static false_type __test(...); }; struct __do_is_nothrow_swappable_with_impl { template<typename _Tp, typename _Up> static __bool_constant< noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) && noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())) > __test(int); template<typename, typename> static false_type __test(...); }; } // namespace __swappable_with_details template<typename _Tp, typename _Up> struct __is_swappable_with_impl : public __swappable_with_details::__do_is_swappable_with_impl { typedef decltype(__test<_Tp, _Up>(0)) type; }; // Optimization for the homogenous lvalue case, not required: template<typename _Tp> struct __is_swappable_with_impl<_Tp&, _Tp&> : public __swappable_details::__do_is_swappable_impl { typedef decltype(__test<_Tp&>(0)) type; }; template<typename _Tp, typename _Up> struct __is_nothrow_swappable_with_impl : public __swappable_with_details::__do_is_nothrow_swappable_with_impl { typedef decltype(__test<_Tp, _Up>(0)) type; }; // Optimization for the homogenous lvalue case, not required: template<typename _Tp> struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&> : public __swappable_details::__do_is_nothrow_swappable_impl { typedef decltype(__test<_Tp&>(0)) type; }; /// is_swappable_with template<typename _Tp, typename _Up> struct is_swappable_with : public __is_swappable_with_impl<_Tp, _Up>::type { }; /// is_nothrow_swappable_with template<typename _Tp, typename _Up> struct is_nothrow_swappable_with : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type { }; #if __cplusplus >= 201402L /// is_swappable_with_v template<typename _Tp, typename _Up> _GLIBCXX17_INLINE constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; /// is_nothrow_swappable_with_v template<typename _Tp, typename _Up> _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; #endif // __cplusplus >= 201402L #endif// c++1z or gnu++11 // __is_invocable (std::is_invocable for C++11) // The primary template is used for invalid INVOKE expressions. template<typename _Result, typename _Ret, bool = is_void<_Ret>::value, typename = void> struct __is_invocable_impl : false_type { }; // Used for valid INVOKE and INVOKE<void> expressions. template<typename _Result, typename _Ret> struct __is_invocable_impl<_Result, _Ret, /* is_void<_Ret> = */ true, __void_t<typename _Result::type>> : true_type { }; #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" // Used for INVOKE<R> expressions to check the implicit conversion to R. template<typename _Result, typename _Ret> struct __is_invocable_impl<_Result, _Ret, /* is_void<_Ret> = */ false, __void_t<typename _Result::type>> { private: // The type of the INVOKE expression. // Unlike declval, this doesn't add_rvalue_reference. static typename _Result::type _S_get(); template<typename _Tp> static void _S_conv(_Tp); // This overload is viable if INVOKE(f, args...) can convert to _Tp. template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))> static true_type _S_test(int); template<typename _Tp> static false_type _S_test(...); public: using type = decltype(_S_test<_Ret>(1)); }; #pragma GCC diagnostic pop template<typename _Fn, typename... _ArgTypes> struct __is_invocable : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type { }; template<typename _Fn, typename _Tp, typename... _Args> constexpr bool __call_is_nt(__invoke_memfun_ref) { using _Up = typename __inv_unwrap<_Tp>::type; return noexcept((std::declval<_Up>().*std::declval<_Fn>())( std::declval<_Args>()...)); } template<typename _Fn, typename _Tp, typename... _Args> constexpr bool __call_is_nt(__invoke_memfun_deref) { return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())( std::declval<_Args>()...)); } template<typename _Fn, typename _Tp> constexpr bool __call_is_nt(__invoke_memobj_ref) { using _Up = typename __inv_unwrap<_Tp>::type; return noexcept(std::declval<_Up>().*std::declval<_Fn>()); } template<typename _Fn, typename _Tp> constexpr bool __call_is_nt(__invoke_memobj_deref) { return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>()); } template<typename _Fn, typename... _Args> constexpr bool __call_is_nt(__invoke_other) { return noexcept(std::declval<_Fn>()(std::declval<_Args>()...)); } template<typename _Result, typename _Fn, typename... _Args> struct __call_is_nothrow : __bool_constant< std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{}) > { }; template<typename _Fn, typename... _Args> using __call_is_nothrow_ = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>; // __is_nothrow_invocable (std::is_nothrow_invocable for C++11) template<typename _Fn, typename... _Args> struct __is_nothrow_invocable : __and_<__is_invocable<_Fn, _Args...>, __call_is_nothrow_<_Fn, _Args...>>::type { }; #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" struct __nonesuchbase {}; struct __nonesuch : private __nonesuchbase { ~__nonesuch() = delete; __nonesuch(__nonesuch const&) = delete; void operator=(__nonesuch const&) = delete; }; #pragma GCC diagnostic pop #if __cplusplus >= 201703L # define __cpp_lib_is_invocable 201703 /// std::invoke_result template<typename _Functor, typename... _ArgTypes> struct invoke_result : public __invoke_result<_Functor, _ArgTypes...> { }; /// std::invoke_result_t template<typename _Fn, typename... _Args> using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; /// std::is_invocable template<typename _Fn, typename... _ArgTypes> struct is_invocable : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type { static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), "_Fn must be a complete class or an unbounded array"); }; /// std::is_invocable_r template<typename _Ret, typename _Fn, typename... _ArgTypes> struct is_invocable_r : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type { static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), "_Fn must be a complete class or an unbounded array"); }; /// std::is_nothrow_invocable template<typename _Fn, typename... _ArgTypes> struct is_nothrow_invocable : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>, __call_is_nothrow_<_Fn, _ArgTypes...>>::type { static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), "_Fn must be a complete class or an unbounded array"); }; template<typename _Result, typename _Ret, typename = void> struct __is_nt_invocable_impl : false_type { }; template<typename _Result, typename _Ret> struct __is_nt_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>> : __or_<is_void<_Ret>, __is_nothrow_convertible<typename _Result::type, _Ret>> { }; /// std::is_nothrow_invocable_r template<typename _Ret, typename _Fn, typename... _ArgTypes> struct is_nothrow_invocable_r : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>, __call_is_nothrow_<_Fn, _ArgTypes...>>::type { }; /// std::is_invocable_v template<typename _Fn, typename... _Args> inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; /// std::is_nothrow_invocable_v template<typename _Fn, typename... _Args> inline constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<_Fn, _Args...>::value; /// std::is_invocable_r_v template<typename _Ret, typename _Fn, typename... _Args> inline constexpr bool is_invocable_r_v = is_invocable_r<_Ret, _Fn, _Args...>::value; /// std::is_nothrow_invocable_r_v template<typename _Ret, typename _Fn, typename... _Args> inline constexpr bool is_nothrow_invocable_r_v = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; #endif // C++17 #if __cplusplus >= 201703L # define __cpp_lib_type_trait_variable_templates 201510L template <typename _Tp> inline constexpr bool is_void_v = is_void<_Tp>::value; template <typename _Tp> inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; template <typename _Tp> inline constexpr bool is_integral_v = is_integral<_Tp>::value; template <typename _Tp> inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; template <typename _Tp> inline constexpr bool is_array_v = is_array<_Tp>::value; template <typename _Tp> inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; template <typename _Tp> inline constexpr bool is_lvalue_reference_v = is_lvalue_reference<_Tp>::value; template <typename _Tp> inline constexpr bool is_rvalue_reference_v = is_rvalue_reference<_Tp>::value; template <typename _Tp> inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<_Tp>::value; template <typename _Tp> inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value; template <typename _Tp> inline constexpr bool is_enum_v = is_enum<_Tp>::value; template <typename _Tp> inline constexpr bool is_union_v = is_union<_Tp>::value; template <typename _Tp> inline constexpr bool is_class_v = is_class<_Tp>::value; template <typename _Tp> inline constexpr bool is_function_v = is_function<_Tp>::value; template <typename _Tp> inline constexpr bool is_reference_v = is_reference<_Tp>::value; template <typename _Tp> inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; template <typename _Tp> inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; template <typename _Tp> inline constexpr bool is_object_v = is_object<_Tp>::value; template <typename _Tp> inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; template <typename _Tp> inline constexpr bool is_compound_v = is_compound<_Tp>::value; template <typename _Tp> inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; template <typename _Tp> inline constexpr bool is_const_v = is_const<_Tp>::value; template <typename _Tp> inline constexpr bool is_volatile_v = is_volatile<_Tp>::value; template <typename _Tp> inline constexpr bool is_trivial_v = is_trivial<_Tp>::value; template <typename _Tp> inline constexpr bool is_trivially_copyable_v = is_trivially_copyable<_Tp>::value; template <typename _Tp> inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value; #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated-declarations" template <typename _Tp> _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead") inline constexpr bool is_pod_v = is_pod<_Tp>::value; #pragma GCC diagnostic pop template <typename _Tp> inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value; template <typename _Tp> inline constexpr bool is_empty_v = is_empty<_Tp>::value; template <typename _Tp> inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value; template <typename _Tp> inline constexpr bool is_abstract_v = is_abstract<_Tp>::value; template <typename _Tp> inline constexpr bool is_final_v = is_final<_Tp>::value; template <typename _Tp> inline constexpr bool is_signed_v = is_signed<_Tp>::value; template <typename _Tp> inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; template <typename _Tp, typename... _Args> inline constexpr bool is_constructible_v = is_constructible<_Tp, _Args...>::value; template <typename _Tp> inline constexpr bool is_default_constructible_v = is_default_constructible<_Tp>::value; template <typename _Tp> inline constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value; template <typename _Tp> inline constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value; template <typename _Tp, typename _Up> inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value; template <typename _Tp> inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value; template <typename _Tp> inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value; template <typename _Tp> inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; template <typename _Tp, typename... _Args> inline constexpr bool is_trivially_constructible_v = is_trivially_constructible<_Tp, _Args...>::value; template <typename _Tp> inline constexpr bool is_trivially_default_constructible_v = is_trivially_default_constructible<_Tp>::value; template <typename _Tp> inline constexpr bool is_trivially_copy_constructible_v = is_trivially_copy_constructible<_Tp>::value; template <typename _Tp> inline constexpr bool is_trivially_move_constructible_v = is_trivially_move_constructible<_Tp>::value; template <typename _Tp, typename _Up> inline constexpr bool is_trivially_assignable_v = is_trivially_assignable<_Tp, _Up>::value; template <typename _Tp> inline constexpr bool is_trivially_copy_assignable_v = is_trivially_copy_assignable<_Tp>::value; template <typename _Tp> inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<_Tp>::value; template <typename _Tp> inline constexpr bool is_trivially_destructible_v = is_trivially_destructible<_Tp>::value; template <typename _Tp, typename... _Args> inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; template <typename _Tp> inline constexpr bool is_nothrow_default_constructible_v = is_nothrow_default_constructible<_Tp>::value; template <typename _Tp> inline constexpr bool is_nothrow_copy_constructible_v = is_nothrow_copy_constructible<_Tp>::value; template <typename _Tp> inline constexpr bool is_nothrow_move_constructible_v = is_nothrow_move_constructible<_Tp>::value; template <typename _Tp, typename _Up> inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<_Tp, _Up>::value; template <typename _Tp> inline constexpr bool is_nothrow_copy_assignable_v = is_nothrow_copy_assignable<_Tp>::value; template <typename _Tp> inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<_Tp>::value; template <typename _Tp> inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value; template <typename _Tp> inline constexpr bool has_virtual_destructor_v = has_virtual_destructor<_Tp>::value; template <typename _Tp> inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; template <typename _Tp> inline constexpr size_t rank_v = rank<_Tp>::value; template <typename _Tp, unsigned _Idx = 0> inline constexpr size_t extent_v = extent<_Tp, _Idx>::value; #ifdef _GLIBCXX_BUILTIN_IS_SAME_AS template <typename _Tp, typename _Up> inline constexpr bool is_same_v = _GLIBCXX_BUILTIN_IS_SAME_AS(_Tp, _Up); #else template <typename _Tp, typename _Up> inline constexpr bool is_same_v = std::is_same<_Tp, _Up>::value; #endif template <typename _Base, typename _Derived> inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value; template <typename _From, typename _To> inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP # define __cpp_lib_has_unique_object_representations 201606 /// has_unique_object_representations template<typename _Tp> struct has_unique_object_representations : bool_constant<__has_unique_object_representations( remove_cv_t<remove_all_extents_t<_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> inline constexpr bool has_unique_object_representations_v = has_unique_object_representations<_Tp>::value; #endif #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE # define __cpp_lib_is_aggregate 201703 /// is_aggregate template<typename _Tp> struct is_aggregate : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { }; /// is_aggregate_v template<typename _Tp> inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value; #endif #endif // C++17 #if __cplusplus > 201703L #define __cpp_lib_remove_cvref 201711L /// Remove references and cv-qualifiers. template<typename _Tp> struct remove_cvref { using type = __remove_cvref_t<_Tp>; }; template<typename _Tp> using remove_cvref_t = __remove_cvref_t<_Tp>; #define __cpp_lib_type_identity 201806L /// Identity metafunction. template<typename _Tp> struct type_identity { using type = _Tp; }; template<typename _Tp> using type_identity_t = typename type_identity<_Tp>::type; #define __cpp_lib_unwrap_ref 201811L /// Unwrap a reference_wrapper template<typename _Tp> struct unwrap_reference { using type = _Tp; }; template<typename _Tp> struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; }; template<typename _Tp> using unwrap_reference_t = typename unwrap_reference<_Tp>::type; /// Decay type and if it's a reference_wrapper, unwrap it template<typename _Tp> struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; }; template<typename _Tp> using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type; #define __cpp_lib_bounded_array_traits 201902L /// True for a type that is an array of known bound. template<typename _Tp> struct is_bounded_array : public __is_array_known_bounds<_Tp> { }; /// True for a type that is an array of unknown bound. template<typename _Tp> struct is_unbounded_array : public __is_array_unknown_bounds<_Tp> { }; template<typename _Tp> inline constexpr bool is_bounded_array_v = is_bounded_array<_Tp>::value; template<typename _Tp> inline constexpr bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; #ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED #define __cpp_lib_is_constant_evaluated 201811L constexpr inline bool is_constant_evaluated() noexcept { return __builtin_is_constant_evaluated(); } #endif template<typename _From, typename _To> using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type; template<typename _Xp, typename _Yp> using __cond_res = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); template<typename _Ap, typename _Bp, typename = void> struct __common_ref_impl { }; // [meta.trans.other], COMMON-REF(A, B) template<typename _Ap, typename _Bp> using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type; // If A and B are both lvalue reference types, ... template<typename _Xp, typename _Yp> struct __common_ref_impl<_Xp&, _Yp&, __void_t<__cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>>> { using type = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; }; // let C be remove_reference_t<COMMON-REF(X&, Y&)>&& template<typename _Xp, typename _Yp> using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&; // If A and B are both rvalue reference types, ... template<typename _Xp, typename _Yp> struct __common_ref_impl<_Xp&&, _Yp&&, _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>, is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>> { using type = __common_ref_C<_Xp, _Yp>; }; // let D be COMMON-REF(const X&, Y&) template<typename _Xp, typename _Yp> using __common_ref_D = __common_ref<const _Xp&, _Yp&>; // If A is an rvalue reference and B is an lvalue reference, ... template<typename _Xp, typename _Yp> struct __common_ref_impl<_Xp&&, _Yp&, _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>> { using type = __common_ref_D<_Xp, _Yp>; }; // If A is an lvalue reference and B is an rvalue reference, ... template<typename _Xp, typename _Yp> struct __common_ref_impl<_Xp&, _Yp&&> : __common_ref_impl<_Yp&&, _Xp&> { }; template<typename _Tp, typename _Up, template<typename> class _TQual, template<typename> class _UQual> struct basic_common_reference { }; template<typename _Tp> struct __xref { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; }; template<typename _Tp> struct __xref<_Tp&> { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&; }; template<typename _Tp> struct __xref<_Tp&&> { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&&; }; template<typename _Tp1, typename _Tp2> using __basic_common_ref = typename basic_common_reference<remove_cvref_t<_Tp1>, remove_cvref_t<_Tp2>, __xref<_Tp1>::template __type, __xref<_Tp2>::template __type>::type; template<typename... _Tp> struct common_reference; template<typename... _Tp> using common_reference_t = typename common_reference<_Tp...>::type; // If sizeof...(T) is zero, there shall be no member type. template<> struct common_reference<> { }; // If sizeof...(T) is one ... template<typename _Tp0> struct common_reference<_Tp0> { using type = _Tp0; }; template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void> struct __common_reference_impl : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1> { }; // If sizeof...(T) is two ... template<typename _Tp1, typename _Tp2> struct common_reference<_Tp1, _Tp2> : __common_reference_impl<_Tp1, _Tp2> { }; // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ... template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1&, _Tp2&, 1, void_t<__common_ref<_Tp1&, _Tp2&>>> { using type = __common_ref<_Tp1&, _Tp2&>; }; template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1&&, _Tp2&&, 1, void_t<__common_ref<_Tp1&&, _Tp2&&>>> { using type = __common_ref<_Tp1&&, _Tp2&&>; }; template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1&, _Tp2&&, 1, void_t<__common_ref<_Tp1&, _Tp2&&>>> { using type = __common_ref<_Tp1&, _Tp2&&>; }; template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1&&, _Tp2&, 1, void_t<__common_ref<_Tp1&&, _Tp2&>>> { using type = __common_ref<_Tp1&&, _Tp2&>; }; // Otherwise, if basic_common_reference<...>::type is well-formed, ... template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1, _Tp2, 2, void_t<__basic_common_ref<_Tp1, _Tp2>>> { using type = __basic_common_ref<_Tp1, _Tp2>; }; // Otherwise, if COND-RES(T1, T2) is well-formed, ... template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1, _Tp2, 3, void_t<__cond_res<_Tp1, _Tp2>>> { using type = __cond_res<_Tp1, _Tp2>; }; // Otherwise, if common_type_t<T1, T2> is well-formed, ... template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1, _Tp2, 4, void_t<common_type_t<_Tp1, _Tp2>>> { using type = common_type_t<_Tp1, _Tp2>; }; // Otherwise, there shall be no member type. template<typename _Tp1, typename _Tp2> struct __common_reference_impl<_Tp1, _Tp2, 5, void> { }; // Otherwise, if sizeof...(T) is greater than two, ... template<typename _Tp1, typename _Tp2, typename... _Rest> struct common_reference<_Tp1, _Tp2, _Rest...> : __common_type_fold<common_reference<_Tp1, _Tp2>, __common_type_pack<_Rest...>> { }; // Reuse __common_type_fold for common_reference<T1, T2, Rest...> template<typename _Tp1, typename _Tp2, typename... _Rest> struct __common_type_fold<common_reference<_Tp1, _Tp2>, __common_type_pack<_Rest...>, void_t<common_reference_t<_Tp1, _Tp2>>> : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...> { }; #endif // C++2a _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++11 #endif // _GLIBCXX_TYPE_TRAITS