| // 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 <type_traits> |
| |
| namespace std { |
| |
| // Defines std:foo_t aliases for typename foo::type. This is a small subset of |
| // <type_traits> which may be expanded as needed. |
| #ifndef __cpp_lib_transformation_trait_aliases |
| |
| template <decltype(sizeof(int)) Len, decltype(sizeof(int)) Align> |
| using aligned_storage_t = typename aligned_storage<Len, Align>::type; |
| |
| template <typename... T> |
| using common_type_t = typename common_type<T...>::type; |
| |
| template <bool B, typename T, typename F> |
| using conditional_t = typename conditional<B, T, F>::type; |
| |
| template <typename T> |
| using decay_t = typename decay<T>::type; |
| |
| template <bool B, typename T = void> |
| using enable_if_t = typename enable_if<B, T>::type; |
| |
| template <typename T> |
| using make_signed_t = typename make_signed<T>::type; |
| |
| template <typename T> |
| using make_unsigned_t = typename make_unsigned<T>::type; |
| |
| template <typename T> |
| using remove_cv_t = typename remove_cv<T>::type; |
| |
| template <typename T> |
| using remove_pointer_t = typename remove_pointer<T>::type; |
| |
| template <typename T> |
| using remove_reference_t = typename remove_reference<T>::type; |
| |
| #endif // __cpp_lib_transformation_trait_aliases |
| |
| #ifndef __cpp_lib_is_null_pointer |
| |
| template <typename T> |
| struct is_null_pointer : std::is_same<decltype(nullptr), std::remove_cv_t<T>> { |
| }; |
| |
| #endif // __cpp_lib_is_null_pointer |
| |
| } // namespace std |