1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd.. All rights reserved. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef BASE_IMPL_H 17 #define BASE_IMPL_H 18 19 #include <memory> 20 21 namespace rosen { 22 enum class AdapterType { 23 NONE, 24 BASE_INTERFACE, 25 SKIA_ADAPTER, 26 OTHER_ADAPTER, 27 }; 28 29 class BaseImpl : public std::enable_shared_from_this<BaseImpl> { 30 public: 31 static inline constexpr AdapterType TYPE = AdapterType::NONE; BaseImpl()32 BaseImpl() noexcept {} ~BaseImpl()33 virtual ~BaseImpl() {} 34 GetType()35 virtual AdapterType GetType() const 36 { 37 return AdapterType::NONE; 38 } 39 40 template<typename T> IsInstanceOf()41 bool IsInstanceOf() 42 { 43 return (GetType() == T::TYPE); 44 } 45 46 template<typename T> DowncastingTo()47 std::shared_ptr<T> DowncastingTo() 48 { 49 return (IsInstanceOf<T>()) ? (std::static_pointer_cast<T>(shared_from_this())) : nullptr; 50 } 51 }; 52 } // namespace rosen 53 #endif // BASE_IMPL_H 54