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/*
* 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 List>
inline IterationRange<typename List::iterator> MakeIterationRange(List& list) {
return IterationRange<typename List::iterator>(list.begin(), list.end());
}
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_
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