| /* |
| * Copyright 2019 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 <optional> |
| |
| namespace bluetooth { |
| namespace packet { |
| namespace parser { |
| |
| // Checks for Initialize(), AddByte(), and GetChecksum(). |
| // T and TRET are the checksum class Type and the checksum return type |
| // C and CRET are the substituted types for T and TRET |
| template <typename T, typename TRET> |
| class ChecksumTypeChecker { |
| public: |
| template <class C, void (C::*)()> |
| struct InitializeChecker {}; |
| |
| template <class C, void (C::*)(uint8_t byte)> |
| struct AddByteChecker {}; |
| |
| template <class C, typename CRET, CRET (C::*)() const> |
| struct GetChecksumChecker {}; |
| |
| // If all the methods are defined, this one matches |
| template <class C, typename CRET> |
| static int Test(InitializeChecker<C, &C::Initialize>*, AddByteChecker<C, &C::AddByte>*, |
| GetChecksumChecker<C, CRET, &C::GetChecksum>*); |
| |
| // This one matches everything else |
| template <class C, typename CRET> |
| static char Test(...); |
| |
| // This checks which template was matched |
| static constexpr bool value = (sizeof(Test<T, TRET>(0, 0, 0)) == sizeof(int)); |
| }; |
| } // namespace parser |
| } // namespace packet |
| } // namespace bluetooth |