| // Copyright 2021 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 <cstddef> |
| #include <type_traits> |
| #include <utility> |
| |
| namespace pw { |
| namespace containers { |
| namespace impl { |
| |
| template <typename T, size_t kSize, size_t... kIndices> |
| constexpr std::array<std::remove_cv_t<T>, kSize> CopyArray( |
| const T (&values)[kSize], std::index_sequence<kIndices...>) { |
| return {{values[kIndices]...}}; |
| } |
| |
| template <typename T, size_t kSize, size_t... kIndices> |
| constexpr std::array<std::remove_cv_t<T>, kSize> MoveArray( |
| T (&&values)[kSize], std::index_sequence<kIndices...>) { |
| return {{std::move(values[kIndices])...}}; |
| } |
| |
| } // namespace impl |
| |
| // pw::containers::to_array is C++14-compatible implementation of C++20's |
| // std::to_array. |
| template <typename T, size_t kSize> |
| constexpr std::array<std::remove_cv_t<T>, kSize> to_array(T (&values)[kSize]) { |
| return impl::CopyArray(values, std::make_index_sequence<kSize>{}); |
| } |
| |
| template <typename T, size_t kSize> |
| constexpr std::array<std::remove_cv_t<T>, kSize> to_array(T (&&values)[kSize]) { |
| return impl::MoveArray(std::move(values), std::make_index_sequence<kSize>{}); |
| } |
| |
| } // namespace containers |
| } // namespace pw |