1 /* 2 * Copyright (c) 2022-2023 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 I_DEVICE_OBSERVER_H 17 #define I_DEVICE_OBSERVER_H 18 19 #include <memory> 20 21 #include "i_device.h" 22 23 namespace OHOS { 24 namespace Msdp { 25 namespace DeviceStatus { 26 class IDeviceObserver { 27 public: 28 IDeviceObserver() = default; 29 virtual ~IDeviceObserver() = default; 30 31 virtual void OnDeviceAdded(std::shared_ptr<IDevice>) = 0; 32 virtual void OnDeviceRemoved(std::shared_ptr<IDevice>) = 0; 33 }; 34 35 inline bool operator<(std::weak_ptr<IDeviceObserver> ptr1, std::weak_ptr<IDeviceObserver> ptr2) 36 { 37 return (ptr1.lock() < ptr2.lock()); 38 } 39 40 inline bool operator==(const std::weak_ptr<IDeviceObserver> ptr1, std::nullptr_t) noexcept 41 { 42 return (ptr1.lock() == nullptr); 43 } 44 } // namespace DeviceStatus 45 } // namespace Msdp 46 } // namespace OHOS 47 #endif // I_DEVICE_OBSERVER_H