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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  all_of.hpp
  9. /// \brief Test ranges to see if all elements match a value or predicate.
  10. /// \author Marshall Clow
  11.  
  12. #ifndef BOOST_ALGORITHM_ALL_OF_HPP
  13. #define BOOST_ALGORITHM_ALL_OF_HPP
  14.  
  15. #include <algorithm>    // for std::all_of, if available
  16. #include <boost/range/begin.hpp>
  17. #include <boost/range/end.hpp>
  18.  
  19. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {  namespace algorithm {
  20.  
  21. #if __cplusplus >= 201103L
  22. //  Use the C++11 versions of all_of if it is available
  23. using std::all_of;      // Section 25.2.1
  24. #else
  25. /// \fn all_of ( InputIterator first, InputIterator last, Predicate p )
  26. /// \return true if all elements in [first, last) satisfy the predicate 'p'
  27. /// \note returns true on an empty range
  28. ///
  29. /// \param first The start of the input sequence
  30. /// \param last  One past the end of the input sequence
  31. /// \param p     A predicate for testing the elements of the sequence
  32. ///
  33. /// \note           This function is part of the C++2011 standard library.
  34. ///  We will use the standard one if it is available,
  35. ///  otherwise we have our own implementation.
  36. template<typename InputIterator, typename Predicate>
  37. bool all_of ( InputIterator first, InputIterator last, Predicate p )
  38. {
  39.     for ( ; first != last; ++first )
  40.         if ( !p(*first))
  41.             return false;
  42.     return true;
  43. }
  44. #endif
  45.  
  46. /// \fn all_of ( const Range &r, Predicate p )
  47. /// \return true if all elements in the range satisfy the predicate 'p'
  48. /// \note returns true on an empty range
  49. ///
  50. /// \param r    The input range
  51. /// \param p    A predicate for testing the elements of the range
  52. ///
  53. template<typename Range, typename Predicate>
  54. bool all_of ( const Range &r, Predicate p )
  55. {
  56.     return mars_boost::algorithm::all_of ( mars_boost::begin (r), mars_boost::end (r), p );
  57. }
  58.  
  59. /// \fn all_of_equal ( InputIterator first, InputIterator last, const T &val )
  60. /// \return true if all elements in [first, last) are equal to 'val'
  61. /// \note returns true on an empty range
  62. ///
  63. /// \param first The start of the input sequence
  64. /// \param last  One past the end of the input sequence
  65. /// \param val   A value to compare against
  66. ///
  67. template<typename InputIterator, typename T>
  68. bool all_of_equal ( InputIterator first, InputIterator last, const T &val )
  69. {
  70.     for ( ; first != last; ++first )
  71.     if ( val != *first )
  72.         return false;
  73.     return true;
  74. }
  75.  
  76. /// \fn all_of_equal ( const Range &r, const T &val )
  77. /// \return true if all elements in the range are equal to 'val'
  78. /// \note returns true on an empty range
  79. ///
  80. /// \param r    The input range
  81. /// \param val  A value to compare against
  82. ///
  83. template<typename Range, typename T>
  84. bool all_of_equal ( const Range &r, const T &val )
  85. {
  86.     return mars_boost::algorithm::all_of_equal ( mars_boost::begin (r), mars_boost::end (r), val );
  87. }
  88.  
  89. }} // namespace boost and algorithm
  90.  
  91. #endif // BOOST_ALGORITHM_ALL_OF_HPP
  92.  
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