mirror of https://github.com/axmolengine/axmol.git
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014-present
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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_N_HPP
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#define RANGES_V3_ALGORITHM_COPY_N_HPP
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#include <functional>
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#include <tuple>
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#include <utility>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/algorithm/result_types.hpp>
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#include <range/v3/functional/identity.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/iterator/operations.hpp>
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#include <range/v3/iterator/traits.hpp>
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#include <range/v3/range/access.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/static_const.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-algorithms
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/// @{
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template<typename I, typename O>
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using copy_n_result = detail::in_out_result<I, O>;
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RANGES_FUNC_BEGIN(copy_n)
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/// \brief function template \c copy_n
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template(typename I, typename O, typename P = identity)(
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requires input_iterator<I> AND weakly_incrementable<O> AND
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indirectly_copyable<I, O>)
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constexpr copy_n_result<I, O> RANGES_FUNC(copy_n)(I first, iter_difference_t<I> n, O out)
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{
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RANGES_EXPECT(0 <= n);
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auto norig = n;
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auto b = uncounted(first);
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for(; n != 0; ++b, ++out, --n)
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*out = *b;
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return {recounted(first, b, norig), out};
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}
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RANGES_FUNC_END(copy_n)
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namespace cpp20
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{
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using ranges::copy_n;
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using ranges::copy_n_result;
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} // namespace cpp20
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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