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  1. /*
  2.    Copyright (c) Marshall Clow 2011-2012.
  3.  
  4.    Distributed under the Boost Software License, Version 1.0. (See accompanying
  5.    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  6. */
  7.  
  8. /// \file  copy_n.hpp
  9. /// \brief Copy n items from one sequence to another
  10. /// \author Marshall Clow
  11.  
  12. #ifndef BOOST_ALGORITHM_COPY_N_HPP
  13. #define BOOST_ALGORITHM_COPY_N_HPP
  14.  
  15. #include <algorithm>    // for std::copy_n, if available
  16.  
  17. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {  namespace algorithm {
  18.  
  19. #if __cplusplus >= 201103L
  20. //  Use the C++11 versions of copy_n if it is available
  21. using std::copy_n;          // Section 25.3.1
  22. #else
  23. /// \fn copy_n ( InputIterator first, Size n, OutputIterator result )
  24. /// \brief Copies exactly n (n > 0) elements from the range starting at first to
  25. ///     the range starting at result.
  26. /// \return         The updated output iterator
  27. ///
  28. /// \param first    The start of the input sequence
  29. /// \param n        The number of elements to copy
  30. /// \param result   An output iterator to write the results into
  31. /// \note           This function is part of the C++2011 standard library.
  32. ///  We will use the standard one if it is available,
  33. ///     otherwise we have our own implementation.
  34. template <typename InputIterator, typename Size, typename OutputIterator>
  35. OutputIterator copy_n ( InputIterator first, Size n, OutputIterator result )
  36. {
  37.     for ( ; n > 0; --n, ++first, ++result )
  38.         *result = *first;
  39.     return result;
  40. }
  41. #endif
  42. }} // namespace boost and algorithm
  43.  
  44. #endif  // BOOST_ALGORITHM_COPY_IF_HPP
  45.  
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