81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-2014
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_ALGORITHM_REVERSE_HPP
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#define RANGES_V3_ALGORITHM_REVERSE_HPP
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/begin_end.hpp>
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#include <range/v3/range_concepts.hpp>
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#include <range/v3/range_traits.hpp>
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#include <range/v3/utility/iterator.hpp>
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#include <range/v3/utility/iterator_concepts.hpp>
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#include <range/v3/utility/iterator_traits.hpp>
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#include <range/v3/utility/swap.hpp>
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#include <range/v3/utility/static_const.hpp>
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namespace ranges
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{
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inline namespace v3
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{
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/// \addtogroup group-algorithms
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/// @{
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struct reverse_fn
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{
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private:
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template<typename I>
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static void impl(I begin, I end, concepts::BidirectionalIterator*)
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{
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while(begin != end)
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{
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if(begin == --end)
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break;
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ranges::iter_swap(begin, end);
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++begin;
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}
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}
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template<typename I>
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static void impl(I begin, I end, concepts::RandomAccessIterator*)
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{
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if(begin != end)
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for(; begin < --end; ++begin)
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ranges::iter_swap(begin, end);
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}
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public:
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template<typename I, typename S,
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CONCEPT_REQUIRES_(BidirectionalIterator<I>() && Sentinel<S, I>() && Permutable<I>())>
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I operator()(I begin, S end_) const
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{
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I end = ranges::next(begin, end_);
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reverse_fn::impl(begin, end, iterator_concept<I>{});
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return end;
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}
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template<typename Rng, typename I = iterator_t<Rng>,
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CONCEPT_REQUIRES_(BidirectionalRange<Rng>() && Permutable<I>())>
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safe_iterator_t<Rng> operator()(Rng &&rng) const
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{
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return (*this)(begin(rng), end(rng));
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}
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};
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/// \sa `reverse_fn`
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/// \ingroup group-algorithms
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RANGES_INLINE_VARIABLE(with_braced_init_args<reverse_fn>, reverse)
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/// @}
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} // namespace v3
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} // namespace ranges
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#endif // include guard
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