v3/algorithm/rotate_copy.hpp

0001 /// \file
0002 // Range v3 library
0003 //
0004 //  Copyright Eric Niebler 2013-present
0005 //
0006 //  Use, modification and distribution is subject to the
0007 //  Boost Software License, Version 1.0. (See accompanying
0008 //  file LICENSE_1_0.txt or copy at
0009 //  http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // Project home: https://github.com/ericniebler/range-v3
0012 //
0013 #ifndef RANGES_V3_ALGORITHM_ROTATE_COPY_HPP
0014 #define RANGES_V3_ALGORITHM_ROTATE_COPY_HPP
0015
0016 #include <functional>
0017
0018 #include <range/v3/range_fwd.hpp>
0019
0020 #include <range/v3/algorithm/copy.hpp>
0021 #include <range/v3/algorithm/result_types.hpp>
0022 #include <range/v3/functional/identity.hpp>
0023 #include <range/v3/iterator/concepts.hpp>
0024 #include <range/v3/iterator/traits.hpp>
0025 #include <range/v3/range/access.hpp>
0026 #include <range/v3/range/concepts.hpp>
0027 #include <range/v3/range/dangling.hpp>
0028 #include <range/v3/range/traits.hpp>
0029 #include <range/v3/utility/static_const.hpp>
0030
0031 #include <range/v3/detail/prologue.hpp>
0032
0033 namespace ranges
0034 {
0035     /// \addtogroup group-algorithms
0036     /// @{
0037     template<typename I, typename O>
0038     using rotate_copy_result = detail::in_out_result<I, O>;
0039
0040     RANGES_FUNC_BEGIN(rotate_copy)
0041
0042         /// \brief function template \c rotate_copy
0043         template(typename I, typename S, typename O, typename P = identity)(
0044             requires forward_iterator<I> AND sentinel_for<S, I> AND
0045             weakly_incrementable<O> AND indirectly_copyable<I, O>)
0046         constexpr rotate_copy_result<I, O> //
0047         RANGES_FUNC(rotate_copy)(I first, I middle, S last, O out) //
0048         {
0049             auto res = ranges::copy(middle, std::move(last), std::move(out));
0050             return {std::move(res.in),
0051                     ranges::copy(std::move(first), middle, std::move(res.out)).out};
0052         }
0053
0054         /// \overload
0055         template(typename Rng, typename O, typename P = identity)(
0056             requires range<Rng> AND weakly_incrementable<O> AND
0057             indirectly_copyable<iterator_t<Rng>, O>)
0058         constexpr rotate_copy_result<borrowed_iterator_t<Rng>, O> //
0059         RANGES_FUNC(rotate_copy)(Rng && rng, iterator_t<Rng> middle, O out) //
0060         {
0061             return (*this)(begin(rng), std::move(middle), end(rng), std::move(out));
0062         }
0063
0064     RANGES_FUNC_END(rotate_copy)
0065
0066     namespace cpp20
0067     {
0068         using ranges::rotate_copy;
0069         using ranges::rotate_copy_result;
0070     } // namespace cpp20
0071     /// @}
0072 } // namespace ranges
0073
0074 #include <range/v3/detail/epilogue.hpp>
0075
0076 #endif