1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
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 #include "adapter_type.h"
22 #include "utils/drawing_macros.h"
23 
24 namespace OHOS {
25 namespace Rosen {
26 namespace Drawing {
27 class BaseImpl {
28 public:
BaseImpl()29     BaseImpl() noexcept {}
~BaseImpl()30     virtual ~BaseImpl() {}
31 
32     virtual AdapterType GetType() const = 0;
33 
34     template<typename T>
IsInstanceOf()35     bool IsInstanceOf()
36     {
37         return (GetType() == T::TYPE);
38     }
39 
40     template<typename T>
DowncastingTo()41     T* DowncastingTo()
42     {
43         return (IsInstanceOf<T>()) ? reinterpret_cast<T*>(this) : nullptr;
44     }
45 };
46 } // namespace Drawing
47 } // namespace Rosen
48 } // namespace OHOS
49 #endif
50