1/*
2 * Copyright (C) 2015 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 ART_RUNTIME_BASE_ITERATION_RANGE_H_
18#define ART_RUNTIME_BASE_ITERATION_RANGE_H_
19
20#include <iterator>
21
22namespace art {
23
24// Helper class that acts as a container for range-based loops, given an iteration
25// range [first, last) defined by two iterators.
26template <typename Iter>
27class IterationRange {
28 public:
29  typedef Iter iterator;
30  typedef typename std::iterator_traits<Iter>::difference_type difference_type;
31  typedef typename std::iterator_traits<Iter>::value_type value_type;
32  typedef typename std::iterator_traits<Iter>::pointer pointer;
33  typedef typename std::iterator_traits<Iter>::reference reference;
34
35  IterationRange(iterator first, iterator last) : first_(first), last_(last) { }
36
37  iterator begin() const { return first_; }
38  iterator end() const { return last_; }
39  iterator cbegin() const { return first_; }
40  iterator cend() const { return last_; }
41
42 private:
43  const iterator first_;
44  const iterator last_;
45};
46
47template <typename Iter>
48static inline IterationRange<Iter> MakeIterationRange(const Iter& begin_it, const Iter& end_it) {
49  return IterationRange<Iter>(begin_it, end_it);
50}
51
52template <typename Iter>
53static inline IterationRange<Iter> MakeEmptyIterationRange(const Iter& it) {
54  return IterationRange<Iter>(it, it);
55}
56
57}  // namespace art
58
59#endif  // ART_RUNTIME_BASE_ITERATION_RANGE_H_
60