| /* |
| * |
| * Copyright (c) 2021 Project CHIP Authors |
| * All rights reserved. |
| * |
| * 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 <cstddef> |
| #include <cstdint> |
| |
| namespace chip { |
| |
| template <class ClassType, class MemberType> |
| constexpr ClassType * OwnerOf(MemberType * ptr, const MemberType ClassType::*member) |
| { |
| return reinterpret_cast<ClassType *>(reinterpret_cast<uintptr_t>(ptr) - offsetof(ClassType, member)); |
| } |
| |
| } // namespace chip |
