// C++11 -*- 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 // . /** @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 #else #include 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 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 constexpr _Tp integral_constant<_Tp, __v>::value; /// The type used as a compile-time boolean with true value. typedef integral_constant true_type; /// The type used as a compile-time boolean with false value. typedef integral_constant false_type; template using __bool_constant = integral_constant; #if __cplusplus > 201402L # define __cpp_lib_bool_constant 201505 template using bool_constant = integral_constant; #endif // Meta programming helper types. template struct conditional; template struct __type_identity { using type = _Type; }; template using __type_identity_t = typename __type_identity<_Tp>::type; template struct __or_; template<> struct __or_<> : public false_type { }; template struct __or_<_B1> : public _B1 { }; template struct __or_<_B1, _B2> : public conditional<_B1::value, _B1, _B2>::type { }; template struct __or_<_B1, _B2, _B3, _Bn...> : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type { }; template struct __and_; template<> struct __and_<> : public true_type { }; template struct __and_<_B1> : public _B1 { }; template struct __and_<_B1, _B2> : public conditional<_B1::value, _B2, _B1>::type { }; template struct __and_<_B1, _B2, _B3, _Bn...> : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type { }; template struct __not_ : public __bool_constant { }; #if __cplusplus >= 201703L template inline constexpr bool __or_v = __or_<_Bn...>::value; template inline constexpr bool __and_v = __and_<_Bn...>::value; #define __cpp_lib_logical_traits 201510 template struct conjunction : __and_<_Bn...> { }; template struct disjunction : __or_<_Bn...> { }; template struct negation : __not_<_Pp> { }; template inline constexpr bool conjunction_v = conjunction<_Bn...>::value; template inline constexpr bool disjunction_v = disjunction<_Bn...>::value; template inline constexpr bool negation_v = negation<_Pp>::value; #endif // C++17 // Forward declarations template struct is_reference; template struct is_function; template struct is_void; template struct __is_array_unknown_bounds; // Helper functions that return false_type for incomplete classes, // incomplete unions and arrays of known bound from those. template constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>) { return {}; } template 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 struct __success_type { typedef _Tp type; }; struct __failure_type { }; template struct remove_cv; // __remove_cv_t (std::remove_cv_t for C++11). template using __remove_cv_t = typename remove_cv<_Tp>::type; template struct is_const; // Primary type categories. template struct __is_void_helper : public false_type { }; template<> struct __is_void_helper : public true_type { }; /// is_void template struct is_void : public __is_void_helper<__remove_cv_t<_Tp>>::type { }; template struct __is_integral_helper : public false_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; #ifdef _GLIBCXX_USE_WCHAR_T template<> struct __is_integral_helper : public true_type { }; #endif #ifdef _GLIBCXX_USE_CHAR8_T template<> struct __is_integral_helper : public true_type { }; #endif template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : public true_type { }; template<> struct __is_integral_helper : 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 : 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 : 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 : 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 : public true_type { }; #endif /// is_integral template struct is_integral : public __is_integral_helper<__remove_cv_t<_Tp>>::type { }; template struct __is_floating_point_helper : public false_type { }; template<> struct __is_floating_point_helper : public true_type { }; template<> struct __is_floating_point_helper : public true_type { }; template<> struct __is_floating_point_helper : public true_type { }; #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) template<> struct __is_floating_point_helper<__float128> : public true_type { }; #endif /// is_floating_point template struct is_floating_point : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type { }; /// is_array template struct is_array : public false_type { }; template struct is_array<_Tp[_Size]> : public true_type { }; template struct is_array<_Tp[]> : public true_type { }; template struct __is_pointer_helper : public false_type { }; template struct __is_pointer_helper<_Tp*> : public true_type { }; /// is_pointer template struct is_pointer : public __is_pointer_helper<__remove_cv_t<_Tp>>::type { }; /// is_lvalue_reference template struct is_lvalue_reference : public false_type { }; template struct is_lvalue_reference<_Tp&> : public true_type { }; /// is_rvalue_reference template struct is_rvalue_reference : public false_type { }; template struct is_rvalue_reference<_Tp&&> : public true_type { }; template struct __is_member_object_pointer_helper : public false_type { }; template struct __is_member_object_pointer_helper<_Tp _Cp::*> : public __not_>::type { }; /// is_member_object_pointer template struct is_member_object_pointer : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type { }; template struct __is_member_function_pointer_helper : public false_type { }; template struct __is_member_function_pointer_helper<_Tp _Cp::*> : public is_function<_Tp>::type { }; /// is_member_function_pointer template struct is_member_function_pointer : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type { }; /// is_enum template struct is_enum : public integral_constant { }; /// is_union template struct is_union : public integral_constant { }; /// is_class template struct is_class : public integral_constant { }; /// is_function template struct is_function : public __bool_constant::value> { }; template struct is_function<_Tp&> : public false_type { }; template struct is_function<_Tp&&> : public false_type { }; #define __cpp_lib_is_null_pointer 201309 template struct __is_null_pointer_helper : public false_type { }; template<> struct __is_null_pointer_helper : public true_type { }; /// is_null_pointer (LWG 2247). template struct is_null_pointer : public __is_null_pointer_helper<__remove_cv_t<_Tp>>::type { }; /// __is_nullptr_t (deprecated extension). template struct __is_nullptr_t : public is_null_pointer<_Tp> { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer"); // Composite type categories. /// is_reference template struct is_reference : public __or_, is_rvalue_reference<_Tp>>::type { }; /// is_arithmetic template struct is_arithmetic : public __or_, is_floating_point<_Tp>>::type { }; /// is_fundamental template struct is_fundamental : public __or_, is_void<_Tp>, is_null_pointer<_Tp>>::type { }; /// is_object template struct is_object : public __not_<__or_, is_reference<_Tp>, is_void<_Tp>>>::type { }; template struct is_member_pointer; /// is_scalar template struct is_scalar : public __or_, is_enum<_Tp>, is_pointer<_Tp>, is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type { }; /// is_compound template struct is_compound : public __not_>::type { }; template struct __is_member_pointer_helper : public false_type { }; template struct __is_member_pointer_helper<_Tp _Cp::*> : public true_type { }; /// is_member_pointer template struct is_member_pointer : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type { }; template struct is_same; template using __is_one_of = __or_...>; // Check if a type is one of the signed integer types. template 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 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 using __is_standard_integer = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>; // __void_t (std::void_t for C++11) template using __void_t = void; // Utility to detect referenceable types ([defns.referenceable]). template struct __is_referenceable : public false_type { }; template struct __is_referenceable<_Tp, __void_t<_Tp&>> : public true_type { }; // Type properties. /// is_const template struct is_const : public false_type { }; template struct is_const<_Tp const> : public true_type { }; /// is_volatile template struct is_volatile : public false_type { }; template struct is_volatile<_Tp volatile> : public true_type { }; /// is_trivial template struct is_trivial : public integral_constant { 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 struct is_trivially_copyable : public integral_constant { 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 struct is_standard_layout : public integral_constant { 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 struct _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead") is_pod : public integral_constant { 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 struct is_literal_type : public integral_constant { static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), "template argument must be a complete class or an unbounded array"); }; /// is_empty template struct is_empty : public integral_constant { }; /// is_polymorphic template struct is_polymorphic : public integral_constant { }; #if __cplusplus >= 201402L #define __cpp_lib_is_final 201402L /// is_final template struct is_final : public integral_constant { }; #endif /// is_abstract template struct is_abstract : public integral_constant { }; template::value> struct __is_signed_helper : public false_type { }; template struct __is_signed_helper<_Tp, true> : public integral_constant { }; /// is_signed template struct is_signed : public __is_signed_helper<_Tp>::type { }; /// is_unsigned template struct is_unsigned : public __and_, __not_>> { }; // Destructible and constructible type properties. /** * @brief Utility to simplify expressions used in unevaluated operands * @ingroup utilities */ template _Up __declval(int); template _Tp __declval(long); template auto declval() noexcept -> decltype(__declval<_Tp>(0)); template struct extent; template struct remove_all_extents; template struct __is_array_known_bounds : public integral_constant::value > 0)> { }; template struct __is_array_unknown_bounds : public __and_, __not_>> { }; // 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().~_Tp())> static true_type __test(int); template static false_type __test(...); }; template struct __is_destructible_impl : public __do_is_destructible_impl { typedef decltype(__test<_Tp>(0)) type; }; template, __is_array_unknown_bounds<_Tp>, is_function<_Tp>>::value, bool = __or_, is_scalar<_Tp>>::value> struct __is_destructible_safe; template struct __is_destructible_safe<_Tp, false, false> : public __is_destructible_impl::type>::type { }; template struct __is_destructible_safe<_Tp, true, false> : public false_type { }; template struct __is_destructible_safe<_Tp, false, true> : public true_type { }; /// is_destructible template 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 static __bool_constant().~_Tp())> __test(int); template static false_type __test(...); }; template struct __is_nt_destructible_impl : public __do_is_nt_destructible_impl { typedef decltype(__test<_Tp>(0)) type; }; template, __is_array_unknown_bounds<_Tp>, is_function<_Tp>>::value, bool = __or_, is_scalar<_Tp>>::value> struct __is_nt_destructible_safe; template struct __is_nt_destructible_safe<_Tp, false, false> : public __is_nt_destructible_impl::type>::type { }; template struct __is_nt_destructible_safe<_Tp, true, false> : public false_type { }; template struct __is_nt_destructible_safe<_Tp, false, true> : public true_type { }; /// is_nothrow_destructible template 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 struct __is_constructible_impl : public __bool_constant<__is_constructible(_Tp, _Args...)> { }; /// is_constructible template 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 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::value> struct __is_copy_constructible_impl; template struct __is_copy_constructible_impl<_Tp, false> : public false_type { }; template struct __is_copy_constructible_impl<_Tp, true> : public __is_constructible_impl<_Tp, const _Tp&> { }; /// is_copy_constructible template 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::value> struct __is_move_constructible_impl; template struct __is_move_constructible_impl<_Tp, false> : public false_type { }; template struct __is_move_constructible_impl<_Tp, true> : public __is_constructible_impl<_Tp, _Tp&&> { }; /// is_move_constructible template 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 struct __is_nt_constructible_impl : public false_type { }; template struct __is_nt_constructible_impl : public __bool_constant()...))> { }; template struct __is_nt_constructible_impl : public __bool_constant(std::declval<_Arg>()))> { }; template struct __is_nt_constructible_impl : public __bool_constant { }; template struct __is_nt_constructible_impl : public __bool_constant::type())> { }; #if __cpp_aggregate_paren_init template struct __is_nt_constructible_impl : public __is_nt_constructible_impl { }; template struct __is_nt_constructible_impl : public __and_<__is_nt_constructible_impl...> { }; #endif template using __is_nothrow_constructible_impl = __is_nt_constructible_impl<__is_constructible(_Tp, _Args...), _Tp, _Args...>; /// is_nothrow_constructible template 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 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::value> struct __is_nothrow_copy_constructible_impl; template struct __is_nothrow_copy_constructible_impl<_Tp, false> : public false_type { }; template struct __is_nothrow_copy_constructible_impl<_Tp, true> : public __is_nothrow_constructible_impl<_Tp, const _Tp&> { }; /// is_nothrow_copy_constructible template 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::value> struct __is_nothrow_move_constructible_impl; template struct __is_nothrow_move_constructible_impl<_Tp, false> : public false_type { }; template struct __is_nothrow_move_constructible_impl<_Tp, true> : public __is_nothrow_constructible_impl<_Tp, _Tp&&> { }; /// is_nothrow_move_constructible template 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 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::value> struct __is_copy_assignable_impl; template struct __is_copy_assignable_impl<_Tp, false> : public false_type { }; template struct __is_copy_assignable_impl<_Tp, true> : public __bool_constant<__is_assignable(_Tp&, const _Tp&)> { }; /// is_copy_assignable template 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::value> struct __is_move_assignable_impl; template struct __is_move_assignable_impl<_Tp, false> : public false_type { }; template struct __is_move_assignable_impl<_Tp, true> : public __bool_constant<__is_assignable(_Tp&, _Tp&&)> { }; /// is_move_assignable template 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 struct __is_nt_assignable_impl : public integral_constant() = declval<_Up>())> { }; template struct __is_nothrow_assignable_impl : public __and_<__bool_constant<__is_assignable(_Tp, _Up)>, __is_nt_assignable_impl<_Tp, _Up>> { }; /// is_nothrow_assignable template 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::value> struct __is_nt_copy_assignable_impl; template struct __is_nt_copy_assignable_impl<_Tp, false> : public false_type { }; template struct __is_nt_copy_assignable_impl<_Tp, true> : public __is_nothrow_assignable_impl<_Tp&, const _Tp&> { }; /// is_nothrow_copy_assignable template 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::value> struct __is_nt_move_assignable_impl; template struct __is_nt_move_assignable_impl<_Tp, false> : public false_type { }; template struct __is_nt_move_assignable_impl<_Tp, true> : public __is_nothrow_assignable_impl<_Tp&, _Tp&&> { }; /// is_nothrow_move_assignable template 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 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 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 static void __helper(const _Tp&); template static true_type __test(const _Tp&, decltype(__helper({}))* = 0); static false_type __test(...); }; template struct __is_implicitly_default_constructible_impl : public __do_is_implicitly_default_constructible_impl { typedef decltype(__test(declval<_Tp>())) type; }; template struct __is_implicitly_default_constructible_safe : public __is_implicitly_default_constructible_impl<_Tp>::type { }; template struct __is_implicitly_default_constructible : public __and_<__is_constructible_impl<_Tp>, __is_implicitly_default_constructible_safe<_Tp>> { }; template::value> struct __is_trivially_copy_constructible_impl; template struct __is_trivially_copy_constructible_impl<_Tp, false> : public false_type { }; template struct __is_trivially_copy_constructible_impl<_Tp, true> : public __and_<__is_copy_constructible_impl<_Tp>, integral_constant> { }; /// is_trivially_copy_constructible template 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::value> struct __is_trivially_move_constructible_impl; template struct __is_trivially_move_constructible_impl<_Tp, false> : public false_type { }; template struct __is_trivially_move_constructible_impl<_Tp, true> : public __and_<__is_move_constructible_impl<_Tp>, integral_constant> { }; /// is_trivially_move_constructible template 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 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::value> struct __is_trivially_copy_assignable_impl; template struct __is_trivially_copy_assignable_impl<_Tp, false> : public false_type { }; template struct __is_trivially_copy_assignable_impl<_Tp, true> : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)> { }; /// is_trivially_copy_assignable template 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::value> struct __is_trivially_move_assignable_impl; template struct __is_trivially_move_assignable_impl<_Tp, false> : public false_type { }; template struct __is_trivially_move_assignable_impl<_Tp, true> : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)> { }; /// is_trivially_move_assignable template 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 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 struct has_virtual_destructor : public integral_constant { 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 struct alignment_of : public integral_constant { static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), "template argument must be a complete class or an unbounded array"); }; /// rank template struct rank : public integral_constant { }; template struct rank<_Tp[_Size]> : public integral_constant::value> { }; template struct rank<_Tp[]> : public integral_constant::value> { }; /// extent template struct extent : public integral_constant { }; template struct extent<_Tp[_Size], _Uint> : public integral_constant::value> { }; template struct extent<_Tp[], _Uint> : public integral_constant::value> { }; // Type relations. /// is_same template struct is_same #ifdef _GLIBCXX_BUILTIN_IS_SAME_AS : public integral_constant #else : public false_type #endif { }; #ifndef _GLIBCXX_BUILTIN_IS_SAME_AS template struct is_same<_Tp, _Tp> : public true_type { }; #endif /// is_base_of template struct is_base_of : public integral_constant { }; template, 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 class __is_convertible_helper<_From, _To, false> { template static void __test_aux(_To1) noexcept; template(std::declval<_From1>()))> static true_type __test(int); template static false_type __test(...); public: typedef decltype(__test<_From, _To>(0)) type; }; #pragma GCC diagnostic pop /// is_convertible template struct is_convertible : public __is_convertible_helper<_From, _To>::type { }; // helper trait for unique_ptr, shared_ptr, and span template using __is_array_convertible = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>; template, 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 class __is_nt_convertible_helper<_From, _To, false> { template static void __test_aux(_To1) noexcept; template static __bool_constant(std::declval<_From1>()))> __test(int); template static false_type __test(...); public: using type = decltype(__test<_From, _To>(0)); }; #pragma GCC diagnostic pop // is_nothrow_convertible for C++11 template 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 struct is_nothrow_convertible : public __is_nt_convertible_helper<_From, _To>::type { }; /// is_nothrow_convertible_v template inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_From, _To>::value; #endif // C++2a // Const-volatile modifications. /// remove_const template struct remove_const { typedef _Tp type; }; template struct remove_const<_Tp const> { typedef _Tp type; }; /// remove_volatile template struct remove_volatile { typedef _Tp type; }; template struct remove_volatile<_Tp volatile> { typedef _Tp type; }; /// remove_cv template struct remove_cv { using type = _Tp; }; template struct remove_cv { using type = _Tp; }; template struct remove_cv { using type = _Tp; }; template struct remove_cv { using type = _Tp; }; /// add_const template struct add_const { typedef _Tp const type; }; /// add_volatile template struct add_volatile { typedef _Tp volatile type; }; /// add_cv template struct add_cv { typedef typename add_const::type>::type type; }; #if __cplusplus > 201103L #define __cpp_lib_transformation_trait_aliases 201304 /// Alias template for remove_const template using remove_const_t = typename remove_const<_Tp>::type; /// Alias template for remove_volatile template using remove_volatile_t = typename remove_volatile<_Tp>::type; /// Alias template for remove_cv template using remove_cv_t = typename remove_cv<_Tp>::type; /// Alias template for add_const template using add_const_t = typename add_const<_Tp>::type; /// Alias template for add_volatile template using add_volatile_t = typename add_volatile<_Tp>::type; /// Alias template for add_cv template using add_cv_t = typename add_cv<_Tp>::type; #endif // Reference transformations. /// remove_reference template struct remove_reference { typedef _Tp type; }; template struct remove_reference<_Tp&> { typedef _Tp type; }; template struct remove_reference<_Tp&&> { typedef _Tp type; }; template::value> struct __add_lvalue_reference_helper { typedef _Tp type; }; template struct __add_lvalue_reference_helper<_Tp, true> { typedef _Tp& type; }; /// add_lvalue_reference template struct add_lvalue_reference : public __add_lvalue_reference_helper<_Tp> { }; template::value> struct __add_rvalue_reference_helper { typedef _Tp type; }; template struct __add_rvalue_reference_helper<_Tp, true> { typedef _Tp&& type; }; /// add_rvalue_reference template struct add_rvalue_reference : public __add_rvalue_reference_helper<_Tp> { }; #if __cplusplus > 201103L /// Alias template for remove_reference template using remove_reference_t = typename remove_reference<_Tp>::type; /// Alias template for add_lvalue_reference template using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; /// Alias template for add_rvalue_reference template using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; #endif // Sign modifications. // Utility for constructing identically cv-qualified types. template struct __cv_selector; template struct __cv_selector<_Unqualified, false, false> { typedef _Unqualified __type; }; template struct __cv_selector<_Unqualified, false, true> { typedef volatile _Unqualified __type; }; template struct __cv_selector<_Unqualified, true, false> { typedef const _Unqualified __type; }; template struct __cv_selector<_Unqualified, true, true> { typedef const volatile _Unqualified __type; }; template::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 struct __make_unsigned { typedef _Tp __type; }; template<> struct __make_unsigned { typedef unsigned char __type; }; template<> struct __make_unsigned { typedef unsigned char __type; }; template<> struct __make_unsigned { typedef unsigned short __type; }; template<> struct __make_unsigned { typedef unsigned int __type; }; template<> struct __make_unsigned { typedef unsigned long __type; }; template<> struct __make_unsigned { 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::value, bool _IsEnum = is_enum<_Tp>::value> class __make_unsigned_selector; template 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 struct _List { }; template struct _List<_Tp, _Up...> : _List<_Up...> { static constexpr size_t __size = sizeof(_Tp); }; template struct __select; template struct __select<_Sz, _List<_Uint, _UInts...>, true> { using __type = _Uint; }; template 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 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; using __unsigned_type = typename __select::__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 { using __type = typename __make_unsigned_selector::__type; }; #endif #ifdef _GLIBCXX_USE_CHAR8_T template<> struct __make_unsigned { using __type = typename __make_unsigned_selector::__type; }; #endif template<> struct __make_unsigned { using __type = typename __make_unsigned_selector::__type; }; template<> struct __make_unsigned { using __type = typename __make_unsigned_selector::__type; }; // Given an integral/enum type, return the corresponding unsigned // integer type. // Primary template. /// make_unsigned template struct make_unsigned { typedef typename __make_unsigned_selector<_Tp>::__type type; }; // Integral, but don't define. template<> struct make_unsigned; // Utility for finding the signed versions of unsigned integral types. template struct __make_signed { typedef _Tp __type; }; template<> struct __make_signed { typedef signed char __type; }; template<> struct __make_signed { typedef signed char __type; }; template<> struct __make_signed { typedef signed short __type; }; template<> struct __make_signed { typedef signed int __type; }; template<> struct __make_signed { typedef signed long __type; }; template<> struct __make_signed { typedef signed long long __type; }; #if defined(__GLIBCXX_TYPE_INT_N_0) template<> struct __make_signed { typedef __GLIBCXX_TYPE_INT_N_0 __type; }; #endif #if defined(__GLIBCXX_TYPE_INT_N_1) template<> struct __make_signed { typedef __GLIBCXX_TYPE_INT_N_1 __type; }; #endif #if defined(__GLIBCXX_TYPE_INT_N_2) template<> struct __make_signed { typedef __GLIBCXX_TYPE_INT_N_2 __type; }; #endif #if defined(__GLIBCXX_TYPE_INT_N_3) template<> struct __make_signed { typedef __GLIBCXX_TYPE_INT_N_3 __type; }; #endif // Select between integral and enum: not possible to be both. template::value, bool _IsEnum = is_enum<_Tp>::value> class __make_signed_selector; template 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 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 { using __type = typename __make_signed_selector::__type; }; #endif #if defined(_GLIBCXX_USE_CHAR8_T) template<> struct __make_signed { using __type = typename __make_signed_selector