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_LIBARTBASE_BASE_ITERATION_RANGE_H_ 18 #define ART_LIBARTBASE_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 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 47 template <typename Iter> 48 inline IterationRange<Iter> MakeIterationRange(const Iter& begin_it, const Iter& end_it) { 49 return IterationRange<Iter>(begin_it, end_it); 50 } 51 52 template <typename Iter> 53 inline IterationRange<Iter> MakeEmptyIterationRange(const Iter& it) { 54 return IterationRange<Iter>(it, it); 55 } 56 57 template <typename Container> 58 inline auto ReverseRange(Container&& c) { 59 typedef typename std::reverse_iterator<decltype(c.begin())> riter; 60 return MakeIterationRange(riter(c.end()), riter(c.begin())); 61 } 62 63 template <typename T, size_t size> 64 inline auto ReverseRange(T (&array)[size]) { 65 return ReverseRange(MakeIterationRange<T*>(array, array+size)); 66 } 67 68 } // namespace art 69 70 #endif // ART_LIBARTBASE_BASE_ITERATION_RANGE_H_ 71
