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/// \file
// Range v3 library
//
// Copyright Eric Niebler 2014-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_ALGORITHM_COPY_N_HPP
#define RANGES_V3_ALGORITHM_COPY_N_HPP
#include <functional>
#include <tuple>
#include <utility>
#include <range/v3/range_fwd.hpp>
#include <range/v3/algorithm/result_types.hpp>
#include <range/v3/functional/identity.hpp>
#include <range/v3/iterator/concepts.hpp>
#include <range/v3/iterator/operations.hpp>
#include <range/v3/iterator/traits.hpp>
#include <range/v3/range/access.hpp>
#include <range/v3/range/concepts.hpp>
#include <range/v3/range/traits.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/detail/prologue.hpp>
namespace ranges
{
/// \addtogroup group-algorithms
/// @{
template<typename I, typename O>
using copy_n_result = detail::in_out_result<I, O>;
RANGES_FUNC_BEGIN(copy_n)
/// \brief function template \c copy_n
template(typename I, typename O, typename P = identity)(
requires input_iterator<I> AND weakly_incrementable<O> AND
indirectly_copyable<I, O>)
constexpr copy_n_result<I, O> RANGES_FUNC(copy_n)(I first, iter_difference_t<I> n, O out)
{
RANGES_EXPECT(0 <= n);
auto norig = n;
auto b = uncounted(first);
for(; n != 0; ++b, ++out, --n)
*out = *b;
return {recounted(first, b, norig), out};
}
RANGES_FUNC_END(copy_n)
namespace cpp20
{
using ranges::copy_n;
using ranges::copy_n_result;
} // namespace cpp20
/// @}
} // namespace ranges
#include <range/v3/detail/epilogue.hpp>
#endif
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