/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef V4L2_CAMERA_HAL_METADATA_STATE_DELEGATE_INTERFACE_H_
#define V4L2_CAMERA_HAL_METADATA_STATE_DELEGATE_INTERFACE_H_

namespace v4l2_camera_hal {

// A StateDelegate is simply a dynamic value that can be queried.
// The value may change between queries.
template <typename T>
class StateDelegateInterface {
 public:
  virtual ~StateDelegateInterface(){};
  // Returns 0 on success, error code on failure.
  virtual int GetValue(T* value) = 0;
};

}  // namespace v4l2_camera_hal

#endif  // V4L2_CAMERA_HAL_METADATA_STATE_DELEGATE_INTERFACE_H_