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  1. /*
  2.    Copyright (c) Marshall Clow 2008-2012.
  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  iota.hpp
  9. /// \brief Generate an increasing series
  10. /// \author Marshall Clow
  11.  
  12. #ifndef BOOST_ALGORITHM_IOTA_HPP
  13. #define BOOST_ALGORITHM_IOTA_HPP
  14.  
  15. #include <numeric>
  16.  
  17. #include <boost/range/begin.hpp>
  18. #include <boost/range/end.hpp>
  19.  
  20. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {  namespace algorithm {
  21.  
  22. #if __cplusplus >= 201103L
  23. //  Use the C++11 versions of iota if it is available
  24. using std::iota;      // Section 26.7.6
  25. #else
  26. /// \fn iota ( ForwardIterator first, ForwardIterator last, T value )
  27. /// \brief Generates an increasing sequence of values, and stores them in [first, last)
  28. ///
  29. /// \param first    The start of the input sequence
  30. /// \param last     One past the end of the input sequence
  31. /// \param value    The initial value of the sequence to be generated
  32. /// \note           This function is part of the C++2011 standard library.
  33. ///  We will use the standard one if it is available,
  34. ///  otherwise we have our own implementation.
  35. template <typename ForwardIterator, typename T>
  36. void iota ( ForwardIterator first, ForwardIterator last, T value )
  37. {
  38.     for ( ; first != last; ++first, ++value )
  39.         *first = value;
  40. }
  41. #endif
  42.  
  43. /// \fn iota ( Range &r, T value )
  44. /// \brief Generates an increasing sequence of values, and stores them in the input Range.
  45. ///
  46. /// \param r        The input range
  47. /// \param value    The initial value of the sequence to be generated
  48. ///
  49. template <typename Range, typename T>
  50. void iota ( Range &r, T value )
  51. {
  52.     mars_boost::algorithm::iota (mars_boost::begin(r), mars_boost::end(r), value);
  53. }
  54.  
  55.  
  56. /// \fn iota_n ( OutputIterator out, T value, std::size_t n )
  57. /// \brief Generates an increasing sequence of values, and stores them in the input Range.
  58. ///
  59. /// \param out      An output iterator to write the results into
  60. /// \param value    The initial value of the sequence to be generated
  61. /// \param n        The number of items to write
  62. ///
  63. template <typename OutputIterator, typename T>
  64. OutputIterator iota_n ( OutputIterator out, T value, std::size_t n )
  65. {
  66.     for ( ; n > 0; --n, ++value )
  67.         *out++ = value;
  68.  
  69.     return out;
  70. }
  71.  
  72. }}
  73.  
  74. #endif  // BOOST_ALGORITHM_IOTA_HPP
  75.  
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