| // 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 <array> |
| #include <type_traits> |
| #include <utility> |
| |
| #include "pw_polyfill/standard_library/namespace.h" |
| |
| #ifndef __cpp_lib_to_array |
| #define __cpp_lib_to_array 201907L |
| |
| _PW_POLYFILL_BEGIN_NAMESPACE_STD |
| |
| namespace impl { |
| |
| template <typename T, size_t size, size_t... indices> |
| constexpr array<remove_cv_t<T>, size> CopyArray(const T (&values)[size], |
| index_sequence<indices...>) { |
| return {{values[indices]...}}; |
| } |
| |
| template <typename T, size_t size, size_t... indices> |
| constexpr array<remove_cv_t<T>, size> MoveArray(T(&&values)[size], |
| index_sequence<indices...>) { |
| return {{move(values[indices])...}}; |
| } |
| |
| } // namespace impl |
| |
| template <typename T, size_t size> |
| constexpr array<remove_cv_t<T>, size> to_array(T (&values)[size]) { |
| return impl::CopyArray(values, make_index_sequence<size>{}); |
| } |
| |
| template <typename T, size_t size> |
| constexpr array<remove_cv_t<T>, size> to_array(T(&&values)[size]) { |
| return impl::MoveArray(move(values), make_index_sequence<size>{}); |
| } |
| |
| _PW_POLYFILL_END_NAMESPACE_STD |
| |
| #endif // __cpp_lib_to_array |