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