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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  is_partitioned.hpp
  9. /// \brief Tell if a sequence is partitioned
  10. /// \author Marshall Clow
  11.  
  12. #ifndef BOOST_ALGORITHM_IS_PARTITIONED_HPP
  13. #define BOOST_ALGORITHM_IS_PARTITIONED_HPP
  14.  
  15. #include <algorithm>    // for std::is_partitioned, if available
  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 is_partitioned if it is available
  24. using std::is_partitioned;      // Section 25.3.13
  25. #else
  26. /// \fn is_partitioned ( InputIterator first, InputIterator last, UnaryPredicate p )
  27. /// \brief Tests to see if a sequence is partitioned according to a predicate
  28. ///
  29. /// \param first    The start of the input sequence
  30. /// \param last     One past the end of the input sequence
  31. /// \param p        The predicate to test the values with
  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 InputIterator, typename UnaryPredicate>
  36. bool is_partitioned ( InputIterator first, InputIterator last, UnaryPredicate p )
  37. {
  38. //  Run through the part that satisfy the predicate
  39.     for ( ; first != last; ++first )
  40.         if ( !p (*first))
  41.             break;
  42. //  Now the part that does not satisfy the predicate
  43.     for ( ; first != last; ++first )
  44.         if ( p (*first))
  45.             return false;
  46.     return true;
  47. }
  48. #endif
  49.  
  50. /// \fn is_partitioned ( const Range &r, UnaryPredicate p )
  51. /// \brief Generates an increasing sequence of values, and stores them in the input Range.
  52. ///
  53. /// \param r        The input range
  54. /// \param p        The predicate to test the values with
  55. ///
  56. template <typename Range, typename UnaryPredicate>
  57. bool is_partitioned ( const Range &r, UnaryPredicate p )
  58. {
  59.     return mars_boost::algorithm::is_partitioned (mars_boost::begin(r), mars_boost::end(r), p);
  60. }
  61.  
  62.  
  63. }}
  64.  
  65. #endif  // BOOST_ALGORITHM_IS_PARTITIONED_HPP
  66.  
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