text: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef ART_LIBARTBASE_BASE_ITERATION_RANGE_H_
  #define ART_LIBARTBASE_BASE_ITERATION_RANGE_H_
  
  #include <iterator>
  
  namespace art {
  
  // Helper class that acts as a container for range-based loops, given an iteration
  // range [first, last) defined by two iterators.
  template <typename Iter>
  class IterationRange {
   public:
    typedef Iter iterator;
    typedef typename std::iterator_traits<Iter>::difference_type difference_type;
    typedef typename std::iterator_traits<Iter>::value_type value_type;
    typedef typename std::iterator_traits<Iter>::pointer pointer;
    typedef typename std::iterator_traits<Iter>::reference reference;
  
    IterationRange(iterator first, iterator last) : first_(first), last_(last) { }
  
    iterator begin() const { return first_; }
    iterator end() const { return last_; }
    iterator cbegin() const { return first_; }
    iterator cend() const { return last_; }
  
   protected:
    iterator first_;
    iterator last_;
  };
  
  template <typename Iter>
  inline IterationRange<Iter> MakeIterationRange(const Iter& begin_it, const Iter& end_it) {
    return IterationRange<Iter>(begin_it, end_it);
  }
  
  template <typename Iter>
  inline IterationRange<Iter> MakeEmptyIterationRange(const Iter& it) {
    return IterationRange<Iter>(it, it);
  }
  
  template <typename Container>
  inline auto ReverseRange(Container&& c) {
    typedef typename std::reverse_iterator<decltype(c.begin())> riter;
    return MakeIterationRange(riter(c.end()), riter(c.begin()));
  }
  
  template <typename T, size_t size>
  inline auto ReverseRange(T (&array)[size]) {
    return ReverseRange(MakeIterationRange<T*>(array, array+size));
  }
  
  }  // namespace art
  
  #endif  // ART_LIBARTBASE_BASE_ITERATION_RANGE_H_
  