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 
22 namespace 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.
26 template <typename Iter>
27 class 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 
IterationRange(iterator first,iterator last)35   IterationRange(iterator first, iterator last) : first_(first), last_(last) { }
36 
begin()37   iterator begin() const { return first_; }
end()38   iterator end() const { return last_; }
cbegin()39   iterator cbegin() const { return first_; }
cend()40   iterator cend() const { return last_; }
41 
42  private:
43   const iterator first_;
44   const iterator last_;
45 };
46 
47 template <typename Iter>
MakeIterationRange(const Iter & begin_it,const Iter & end_it)48 static inline IterationRange<Iter> MakeIterationRange(const Iter& begin_it, const Iter& end_it) {
49   return IterationRange<Iter>(begin_it, end_it);
50 }
51 
52 }  // namespace art
53 
54 #endif  // ART_RUNTIME_BASE_ITERATION_RANGE_H_
55