1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef V4L2_CAMERA_HAL_METADATA_STATE_DELEGATE_INTERFACE_H_ 18 #define V4L2_CAMERA_HAL_METADATA_STATE_DELEGATE_INTERFACE_H_ 19 20 namespace v4l2_camera_hal { 21 22 // A StateDelegate is simply a dynamic value that can be queried. 23 // The value may change between queries. 24 template <typename T> 25 class StateDelegateInterface { 26 public: ~StateDelegateInterface()27 virtual ~StateDelegateInterface(){}; 28 // Returns 0 on success, error code on failure. 29 virtual int GetValue(T* value) = 0; 30 }; 31 32 } // namespace v4l2_camera_hal 33 34 #endif // V4L2_CAMERA_HAL_METADATA_STATE_DELEGATE_INTERFACE_H_ 35