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