1/*
2 * Copyright (c) 2023 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 OHOS_EDM_SINGLE_INSTANCE_H
17#define OHOS_EDM_SINGLE_INSTANCE_H
18
19namespace OHOS {
20namespace ExternalDeviceManager {
21#define DECLARE_SINGLE_INSTANCE_BASE(className)       \
22public:                                               \
23    static className &GetInstance();                  \
24                                                      \
25private:                                              \
26    className(const className &) = delete;            \
27    className &operator=(const className &) = delete; \
28    className(className &&) = delete;                 \
29    className &operator=(className &&) = delete
30
31#define DECLARE_SINGLE_INSTANCE(className)  \
32    DECLARE_SINGLE_INSTANCE_BASE(className) \
33                                            \
34private:                                    \
35    className() = default;                  \
36    ~className() = default
37
38// please remeber release instance
39#define IMPLEMENT_SINGLE_INSTANCE(className)    \
40    className &className::GetInstance()         \
41    {                                           \
42        static auto instance = new className(); \
43        return *instance;                       \
44    }
45}; // namespace ExternalDeviceManager
46}; // namespace OHOS
47#endif
48