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Diffstat (limited to 'boost/algorithm/cxx11/copy_n.hpp')
-rw-r--r-- | boost/algorithm/cxx11/copy_n.hpp | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/boost/algorithm/cxx11/copy_n.hpp b/boost/algorithm/cxx11/copy_n.hpp new file mode 100644 index 0000000000..0ea53bd23f --- /dev/null +++ b/boost/algorithm/cxx11/copy_n.hpp @@ -0,0 +1,44 @@ +/* + 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 <algorithm> // for std::copy_n, if available + +namespace boost { namespace algorithm { + +#if __cplusplus >= 201103L +// Use the C++11 versions of copy_n if it is available +using std::copy_n; // Section 25.3.1 +#else +/// \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. +/// We will use the standard one if it is available, +/// otherwise we have our own implementation. +template <typename InputIterator, typename Size, typename OutputIterator> +OutputIterator copy_n ( InputIterator first, Size n, OutputIterator result ) +{ + for ( ; n > 0; --n, ++first, ++result ) + *result = *first; + return result; +} +#endif +}} // namespace boost and algorithm + +#endif // BOOST_ALGORITHM_COPY_IF_HPP |