| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| #pragma once |
| |
| #include "pw_polyfill/standard_library/namespace.h" |
| |
| _PW_POLYFILL_BEGIN_NAMESPACE_STD |
| |
| #define __cpp_lib_transformation_trait_aliases 201304L |
| #define __cpp_lib_type_trait_variable_templates 201510L |
| |
| template <decltype(sizeof(0)) kLength, |
| decltype(sizeof(0)) kAlignment> // no default |
| struct aligned_storage { |
| struct type { |
| alignas(kAlignment) unsigned char __data[kLength]; |
| }; |
| }; |
| |
| template <decltype(sizeof(0)) kLength, |
| decltype(sizeof(0)) kAlignment> // no default |
| using aligned_storage_t = typename aligned_storage<kLength, kAlignment>::type; |
| |
| #define __cpp_lib_integral_constant_callable 201304L |
| |
| template <typename T, T kValue> |
| struct integral_constant { |
| using value_type = T; |
| using type = integral_constant; |
| |
| static constexpr T value = kValue; |
| |
| constexpr operator value_type() const noexcept { return value; } |
| |
| constexpr value_type operator()() const noexcept { return value; } |
| }; |
| |
| #define __cpp_lib_bool_constant 201505L |
| |
| template <bool kValue> |
| using bool_constant = integral_constant<bool, kValue>; |
| |
| using true_type = bool_constant<true>; |
| using false_type = bool_constant<false>; |
| |
| template <typename T> |
| struct is_aggregate : bool_constant<__is_aggregate(T)> {}; |
| |
| template <typename T> |
| static constexpr bool is_aggregate_v = is_aggregate<T>::value; |
| |
| template <typename T> |
| struct is_array : false_type {}; |
| template <typename T> |
| struct is_array<T[]> : true_type {}; |
| template <typename T, decltype(sizeof(0)) kSize> |
| struct is_array<T[kSize]> : true_type {}; |
| template <typename T> |
| inline constexpr bool is_array_v = is_array<T>::value; |
| |
| template <typename T> |
| struct is_const : false_type {}; |
| template <typename T> |
| struct is_const<const T> : true_type {}; |
| template <typename T> |
| inline constexpr bool is_const_v = is_const<T>::value; |
| |
| template <typename T> |
| struct is_lvalue_reference : false_type {}; |
| template <typename T> |
| struct is_lvalue_reference<T&> : true_type {}; |
| template <typename T> |
| inline constexpr bool is_lvalue_reference_v = is_lvalue_reference<T>::value; |
| |
| template <typename T> |
| struct is_rvalue_reference : false_type {}; |
| template <typename T> |
| struct is_rvalue_reference<T&&> : true_type {}; |
| template <typename T> |
| inline constexpr bool is_rvalue_reference_v = is_rvalue_reference<T>::value; |
| |
| template <typename T> |
| struct remove_cv; // Forward declaration |
| |
| namespace impl { |
| |
| template <typename T> |
| struct is_floating_point : false_type {}; |
| |
| template <> |
| struct is_floating_point<float> : true_type {}; |
| template <> |
| struct is_floating_point<double> : true_type {}; |
| template <> |
| struct is_floating_point<long double> : true_type {}; |
| |
| } // namespace impl |
| |
| template <typename T> |
| struct is_floating_point |
| : impl::is_floating_point<typename remove_cv<T>::type> {}; |
| |
| template <typename T> |
| inline constexpr bool is_floating_point_v = is_floating_point<T>::value; |
| |
| namespace impl { |
| |
| template <typename T> |
| struct is_integral : false_type {}; |
| |
| template <> |
| struct is_integral<bool> : true_type {}; |
| template <> |
| struct is_integral<char> : true_type {}; |
| template <> |
| struct is_integral<char16_t> : true_type {}; |
| template <> |
| struct is_integral<char32_t> : true_type {}; |
| template <> |
| struct is_integral<wchar_t> : true_type {}; |
| |
| template <> |
| struct is_integral<short> : true_type {}; |
| template <> |
| struct is_integral<unsigned short> : true_type {}; |
| template <> |
| struct is_integral<int> : true_type {}; |
| template <> |
| struct is_integral<unsigned int> : true_type {}; |
| template <> |
| struct is_integral<long> : true_type {}; |
| template <> |
| struct is_integral<unsigned long> : true_type {}; |
| template <> |
| struct is_integral<long long> : true_type {}; |
| template <> |
| struct is_integral<unsigned long long> : true_type {}; |
| |
| } // namespace impl |
| |
| template <typename T> |
| struct is_integral : impl::is_integral<typename remove_cv<T>::type> {}; |
| |
| template <typename T> |
| inline constexpr bool is_integral_v = is_integral<T>::value; |
| |
| template <typename T> |
| struct is_arithmetic |
| : bool_constant<is_integral_v<T> || is_floating_point_v<T>> {}; |
| |
| template <typename T> |
| inline constexpr bool is_arithmetic_v = is_arithmetic<T>::value; |
| |
| #define __cpp_lib_is_null_pointer 201309L |
| |
| template <typename T> |
| struct is_null_pointer : false_type {}; |
| |
| template <> |
| struct is_null_pointer<decltype(nullptr)> : true_type {}; |
| |
| template <typename T> |
| inline constexpr bool is_null_pointer_v = is_null_pointer<T>::value; |
| |
| template <typename T> |
| struct is_pointer : false_type {}; |
| |
| template <typename T> |
| struct is_pointer<T*> : true_type {}; |
| |
| template <typename T> |
| inline constexpr bool is_pointer_v = is_pointer<T>::value; |
| |
| template <typename T, typename U> |
| struct is_same : false_type {}; |
| |
| template <typename T> |
| struct is_same<T, T> : true_type {}; |
| |
| template <typename T, typename U> |
| inline constexpr bool is_same_v = is_same<T, U>::value; |
| |
| namespace impl { |
| |
| template <typename T, bool = is_arithmetic<T>::value> |
| struct is_signed : integral_constant<bool, T(-1) < T(0)> {}; |
| |
| template <typename T> |
| struct is_signed<T, false> : false_type {}; |
| |
| } // namespace impl |
| |
| template <typename T> |
| struct is_signed : impl::is_signed<T>::type {}; |
| |
| template <typename T> |
| inline constexpr bool is_signed_v = is_signed<T>::value; |
| |
| template <typename T> |
| struct is_unsigned : bool_constant<!is_signed_v<T>> {}; |
| |
| template <typename T> |
| inline constexpr bool is_unsigned_v = is_unsigned<T>::value; |
| |
| template <typename T> |
| struct is_void : is_same<void, typename remove_cv<T>::type> {}; |
| |
| template <typename T> |
| inline constexpr bool is_void_v = is_void<T>::value; |
| |
| template <bool kBool, typename TrueType, typename FalseType> |
| struct conditional { |
| using type = TrueType; |
| }; |
| |
| template <typename TrueType, typename FalseType> |
| struct conditional<false, TrueType, FalseType> { |
| using type = FalseType; |
| }; |
| |
| template <bool kBool, typename TrueType, typename FalseType> |
| using conditional_t = typename conditional<kBool, TrueType, FalseType>::type; |
| |
| #define __cpp_lib_logical_traits 201510L |
| |
| template <typename...> |
| struct conjunction; |
| |
| template <> |
| struct conjunction<> : true_type {}; |
| |
| template <typename T> |
| struct conjunction<T> : T {}; |
| |
| template <typename First, typename... Others> |
| struct conjunction<First, Others...> |
| : conditional_t<bool(First::value), conjunction<Others...>, First> {}; |
| |
| template <typename... Types> |
| inline constexpr bool conjunction_v = conjunction<Types...>::value; |
| |
| template <typename...> |
| struct disjunction; |
| |
| template <> |
| struct disjunction<> : false_type {}; |
| |
| template <typename T> |
| struct disjunction<T> : T {}; |
| |
| template <typename First, typename... Others> |
| struct disjunction<First, Others...> |
| : conditional_t<bool(First::value), First, disjunction<Others...>> {}; |
| |
| template <typename... Types> |
| inline constexpr bool disjunction_v = disjunction<Types...>::value; |
| |
| template <typename T> |
| struct negation : bool_constant<!bool(T::value)> {}; |
| |
| template <typename T> |
| inline constexpr bool negation_v = negation<T>::value; |
| |
| template <bool kEnable, typename T = void> |
| struct enable_if { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct enable_if<false, T> {}; |
| |
| template <bool kEnable, typename T = void> |
| using enable_if_t = typename enable_if<kEnable, T>::type; |
| |
| template <typename T> |
| struct remove_const { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_const<const T> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| using remove_const_t = typename remove_const<T>::type; |
| |
| template <typename T> |
| struct remove_volatile { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_volatile<volatile T> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| using remove_volatile_t = typename remove_volatile<T>::type; |
| |
| template <typename T> |
| struct remove_cv { |
| using type = remove_volatile_t<remove_const_t<T>>; |
| }; |
| |
| template <typename T> |
| using remove_cv_t = typename remove_cv<T>::type; |
| |
| template <typename T> |
| struct remove_extent { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_extent<T[]> { |
| using type = T; |
| }; |
| |
| template <typename T, decltype(sizeof(0)) kSize> |
| struct remove_extent<T[kSize]> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| using remove_extent_t = typename remove_extent<T>::type; |
| |
| template <typename T> |
| struct remove_pointer { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_pointer<T*> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_pointer<T* const> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_pointer<T* volatile> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_pointer<T* const volatile> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| using remove_pointer_t = typename remove_pointer<T>::type; |
| |
| template <typename T> |
| struct remove_reference { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_reference<T&> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| struct remove_reference<T&&> { |
| using type = T; |
| }; |
| |
| template <typename T> |
| using remove_reference_t = typename remove_reference<T>::type; |
| |
| // NOT IMPLEMENTED: This implementation is INCOMPLETE, as it does not cover |
| // function types. |
| template <typename T> |
| struct decay { |
| private: |
| using U = remove_reference_t<T>; |
| |
| public: |
| using type = |
| conditional_t<is_array<U>::value, remove_extent_t<U>*, remove_cv_t<U>>; |
| }; |
| |
| template <typename T> |
| using decay_t = typename decay<T>::type; |
| |
| #define __cpp_lib_type_identity 201806 |
| |
| template <class T> |
| struct type_identity { |
| using type = T; |
| }; |
| |
| template <typename T> |
| using type_identity_t = typename type_identity<T>::type; |
| |
| #define __cpp_lib_void_t 201411L |
| |
| template <typename...> |
| using void_t = void; |
| |
| namespace impl { |
| |
| template <typename T> |
| type_identity<T&> AddLValueReference(int); |
| |
| template <typename T> |
| type_identity<T> AddLValueReference(...); |
| |
| template <typename T> |
| type_identity<T&&> AddRValueReference(int); |
| |
| template <typename T> |
| type_identity<T> AddRValueReference(...); |
| |
| } // namespace impl |
| |
| template <class T> |
| struct add_lvalue_reference : decltype(impl::AddLValueReference<T>(0)) {}; |
| |
| template <typename T> |
| using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; |
| |
| template <class T> |
| struct add_rvalue_reference : decltype(impl::AddRValueReference<T>(0)) {}; |
| |
| template <typename T> |
| using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; |
| |
| template <typename T> |
| add_rvalue_reference_t<T> declval() noexcept; |
| |
| namespace impl { |
| |
| template <class T> |
| struct add_const { |
| typedef const T type; |
| }; |
| |
| } // namespace impl |
| |
| template <class T> |
| using add_const_t = typename impl::add_const<T>::type; |
| |
| template <typename T> |
| struct make_signed; |
| |
| template <typename T> |
| struct make_unsigned; |
| |
| #define _PW_MAKE_SIGNED_SPECIALIZATION(base, signed_type, unsigned_type) \ |
| template <> \ |
| struct make_signed<base> { \ |
| using type = signed_type; \ |
| }; \ |
| template <> \ |
| struct make_unsigned<base> { \ |
| using type = unsigned_type; \ |
| } |
| |
| _PW_MAKE_SIGNED_SPECIALIZATION(char, signed char, unsigned char); |
| _PW_MAKE_SIGNED_SPECIALIZATION(signed char, signed char, unsigned char); |
| _PW_MAKE_SIGNED_SPECIALIZATION(unsigned char, signed char, unsigned char); |
| |
| _PW_MAKE_SIGNED_SPECIALIZATION(short, signed short, unsigned short); |
| _PW_MAKE_SIGNED_SPECIALIZATION(unsigned short, signed short, unsigned short); |
| |
| _PW_MAKE_SIGNED_SPECIALIZATION(int, signed int, unsigned int); |
| _PW_MAKE_SIGNED_SPECIALIZATION(unsigned int, signed int, unsigned int); |
| |
| _PW_MAKE_SIGNED_SPECIALIZATION(long, signed long, unsigned long); |
| _PW_MAKE_SIGNED_SPECIALIZATION(unsigned long, signed long, unsigned long); |
| |
| _PW_MAKE_SIGNED_SPECIALIZATION(long long, signed short, unsigned short); |
| _PW_MAKE_SIGNED_SPECIALIZATION(unsigned long long, |
| signed short, |
| unsigned short); |
| |
| // Skip specializations for char8_t, etc. |
| |
| template <typename T> |
| using make_signed_t = typename make_signed<T>::type; |
| |
| template <typename T> |
| using make_unsigned_t = typename make_unsigned<T>::type; |
| |
| namespace impl { |
| |
| template <typename> |
| using templated_true = true_type; |
| |
| template <typename T> |
| auto returnable(int) -> templated_true<T()>; |
| |
| template <typename> |
| auto returnable(...) -> false_type; |
| |
| template <typename From, typename To> |
| auto convertible(int) |
| -> templated_true<decltype(declval<void (&)(To)>()(declval<From>()))>; |
| |
| template <typename, typename> |
| auto convertible(...) -> false_type; |
| |
| } // namespace impl |
| |
| template <typename From, typename To> |
| struct is_convertible |
| : bool_constant<(decltype(impl::returnable<To>(0))() && |
| decltype(impl::convertible<From, To>(0))()) || |
| (is_void_v<From> && is_void_v<To>)> {}; |
| |
| template <typename T, typename U> |
| inline constexpr bool is_convertible_v = is_convertible<T, U>::value; |
| |
| template <typename T> |
| struct alignment_of : integral_constant<decltype(sizeof(0)), alignof(T)> {}; |
| template <typename T> |
| inline constexpr decltype(sizeof(0)) alignment_of_v = alignment_of<T>::value; |
| |
| #define PW_STDLIB_UNIMPLEMENTED(name) \ |
| [[deprecated(#name " is NOT IMPLEMENTED in pw_minimal_cpp_stdlib!")]] |
| |
| // NOT IMPLEMENTED: Stubs are provided for these traits classes, but they do not |
| // return useful values. Many of these would require compiler builtins. |
| #define PW_BOOLEAN_TRAIT_NOT_SUPPORTED(name) \ |
| template <typename T> \ |
| struct name : false_type {}; \ |
| template <typename T> \ |
| PW_STDLIB_UNIMPLEMENTED(name) \ |
| inline constexpr bool name##_v = name<T>::value |
| |
| #define PW_BOOLEAN_TRAIT_NOT_SUPPORTED_2(name) \ |
| template <typename T, typename U> \ |
| struct name : false_type {}; \ |
| template <typename T, typename U> \ |
| PW_STDLIB_UNIMPLEMENTED(name) \ |
| inline constexpr bool name##_v = name<T, U>::value |
| |
| #define PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(name) \ |
| template <typename T, typename... Args> \ |
| struct name : false_type {}; \ |
| template <typename T, typename... Args> \ |
| PW_STDLIB_UNIMPLEMENTED(name) \ |
| inline constexpr bool name##_v = name<T, Args...>::value |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_class); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_enum); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_function); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_member_function_pointer); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_member_object_pointer); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_union); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_compound); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_fundamental); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_member_pointer); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_object); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_reference); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_scalar); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_abstract); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_empty); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_final); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_pod); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_polymorphic); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_standard_layout); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_trivial); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_trivially_copyable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_volatile); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_constructible); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_default_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_default_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_default_constructible); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_copy_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_copy_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_copy_constructible); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_move_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_move_constructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_move_constructible); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_assignable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_assignable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_assignable); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_copy_assignable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_copy_assignable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_copy_assignable); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_move_assignable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_nothrow_move_assignable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS(is_trivially_move_assignable); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_destructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_nothrow_destructible); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_trivially_destructible); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(has_virtual_destructor); |
| |
| template <typename T> |
| struct extent : integral_constant<decltype(sizeof(0)), 1> {}; |
| template <typename T> |
| PW_STDLIB_UNIMPLEMENTED(extent) |
| inline constexpr decltype(sizeof(0)) extent_v = extent<T>::value; |
| |
| template <typename T> |
| struct rank : integral_constant<decltype(sizeof(0)), 1> {}; |
| template <typename T> |
| PW_STDLIB_UNIMPLEMENTED(rank) |
| inline constexpr decltype(sizeof(0)) rank_v = extent<T>::value; |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED_2(is_base_of); |
| |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_invocable_r); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_invocable); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_nothrow_invocable_r); |
| PW_BOOLEAN_TRAIT_NOT_SUPPORTED(is_nothrow_invocable); |
| |
| template <typename T> |
| struct invoke_result {}; |
| template <typename T> |
| using invoke_result_t = typename invoke_result<T>::type; |
| |
| template <typename T> |
| struct underlying_type { |
| using type = T; |
| }; |
| template <typename T> |
| using underlying_type_t = typename underlying_type<T>::type; |
| |
| #undef PW_BOOLEAN_TRAIT_NOT_SUPPORTED |
| #undef PW_BOOLEAN_TRAIT_NOT_SUPPORTED_2 |
| #undef PW_BOOLEAN_TRAIT_NOT_SUPPORTED_VARARGS |
| #undef PW_STDLIB_UNIMPLEMENTED |
| |
| _PW_POLYFILL_END_NAMESPACE_STD |