| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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 <cstdint> |
| #include <type_traits> |
| |
| namespace bluetooth { |
| namespace packet { |
| |
| template <typename T> |
| class CustomFieldFixedSizeInterface { |
| public: |
| virtual ~CustomFieldFixedSizeInterface() = default; |
| // Get a pointer to a modifiable and readable continuous array of data |
| virtual uint8_t* data() = 0; |
| virtual const uint8_t* data() const = 0; |
| // Get the length of underlying data array, data() + length() would be invalid |
| // subclass T must have kLength variable defined |
| static constexpr size_t length() { |
| static_assert( |
| std::is_same_v<decltype(T::kLength), const size_t>, "T::kLength must be const size_t or constexpr size_t"); |
| static_assert(std::is_const_v<decltype(T::kLength)>, "T::kLength must be const"); |
| return T::kLength; |
| }; |
| }; |
| |
| } // namespace packet |
| } // namespace bluetooth |
