72 lines
2.3 KiB
C++
72 lines
2.3 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_COPY_BACKWARD_HPP
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#define RANGES_V3_ALGORITHM_COPY_BACKWARD_HPP
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#include <utility>
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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_concepts.hpp>
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#include <range/v3/utility/iterator_traits.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/utility/tagged_pair.hpp>
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#include <range/v3/algorithm/tagspec.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 copy_backward_fn
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{
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template<typename I, typename S, typename O,
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CONCEPT_REQUIRES_(
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BidirectionalIterator<I>() && Sentinel<S, I>() &&
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BidirectionalIterator<O>() &&
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IndirectlyCopyable<I, O>()
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)>
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tagged_pair<tag::in(I), tag::out(O)> operator()(I begin, S end_, O out) const
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{
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I i = ranges::next(begin, end_), end = i;
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while(begin != i)
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*--out = *--i;
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return {end, out};
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}
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template<typename Rng, typename O,
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typename I = iterator_t<Rng>,
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CONCEPT_REQUIRES_(
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BidirectionalRange<Rng>() &&
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BidirectionalIterator<O>() &&
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IndirectlyCopyable<I, O>()
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)>
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tagged_pair<tag::in(safe_iterator_t<Rng>), tag::out(O)>
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operator()(Rng &&rng, O out) const
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{
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return (*this)(begin(rng), end(rng), std::move(out));
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}
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};
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/// \sa `copy_backward_fn`
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/// \ingroup group-algorithms
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RANGES_INLINE_VARIABLE(with_braced_init_args<copy_backward_fn>,
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copy_backward)
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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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