boost/algorithm/cxx11/copy_n.hpp
/*
Copyright (c) Marshall Clow 2011-2012.
Distributed under 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)
*/
/// \file copy_n.hpp
/// \brief Copy n items from one sequence to another
/// \author Marshall Clow
#ifndef BOOST_ALGORITHM_COPY_N_HPP
#define BOOST_ALGORITHM_COPY_N_HPP
#include <boost/config.hpp>
namespace boost { namespace algorithm {
/// \fn copy_n ( InputIterator first, Size n, OutputIterator result )
/// \brief Copies exactly n (n > 0) elements from the range starting at first to
/// the range starting at result.
/// \return The updated output iterator
///
/// \param first The start of the input sequence
/// \param n The number of elements to copy
/// \param result An output iterator to write the results into
/// \note This function is part of the C++2011 standard library.
template <typename InputIterator, typename Size, typename OutputIterator>
BOOST_CXX14_CONSTEXPR OutputIterator copy_n ( InputIterator first, Size n, OutputIterator result )
{
for ( ; n > 0; --n, ++first, ++result )
*result = *first;
return result;
}
}} // namespace boost and algorithm
#endif // BOOST_ALGORITHM_COPY_IF_HPP