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_ARRAY_VECTOR_H_
18#define V4L2_CAMERA_HAL_ARRAY_VECTOR_H_
19
20#include <array>
21#include <vector>
22
23namespace v4l2_camera_hal {
24// ArrayVector behaves like a std::vector of fixed length C arrays,
25// with push_back accepting std::arrays to standardize length.
26// Specific methods to get number of arrays/number of elements
27// are provided and an ambiguous "size" is not, to avoid accidental
28// incorrect use.
29template <class T, size_t N>
30class ArrayVector {
31 public:
32  const T* data() const { return mItems.data(); }
33  // The number of arrays.
34  size_t num_arrays() const { return mItems.size() / N; }
35  // The number of elements amongst all arrays.
36  size_t total_num_elements() const { return mItems.size(); }
37
38  // Access the ith array.
39  const T* operator[](int i) const { return mItems.data() + (i * N); }
40  T* operator[](int i) { return mItems.data() + (i * N); }
41
42  void push_back(const std::array<T, N>& values) {
43    mItems.insert(mItems.end(), values.begin(), values.end());
44  }
45
46 private:
47  std::vector<T> mItems;
48};
49
50}  // namespace v4l2_camera_hal
51
52#endif  // V4L2_CAMERA_HAL_ARRAY_VECTOR_H_
53