ceph/src/boost/boost/algorithm/cxx14/equal.hpp

   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  equal.hpp
   9 /// \brief Test ranges to if they are equal
  10 /// \author Marshall Clow
  11
  12 #ifndef BOOST_ALGORITHM_EQUAL_HPP
  13 #define BOOST_ALGORITHM_EQUAL_HPP
  14
  15 #include <algorithm>    // for std::equal
  16 #include <iterator>
  17
  18 namespace boost { namespace algorithm {
  19
  20 namespace detail {
  21
  22     template <class T1, class T2>
  23     struct eq {
  24         bool operator () ( const T1& v1, const T2& v2 ) const { return v1 == v2 ;}
  25         };
  26
  27     template <class RandomAccessIterator1, class RandomAccessIterator2, class BinaryPredicate>
  28     bool equal ( RandomAccessIterator1 first1, RandomAccessIterator1 last1,
  29                  RandomAccessIterator2 first2, RandomAccessIterator2 last2, BinaryPredicate pred,
  30                  std::random_access_iterator_tag, std::random_access_iterator_tag )
  31     {
  32     //  Random-access iterators let is check the sizes in constant time
  33         if ( std::distance ( first1, last1 ) != std::distance ( first2, last2 ))
  34             return false;
  35     // If we know that the sequences are the same size, the original version is fine
  36         return std::equal ( first1, last1, first2, pred );
  37     }
  38
  39     template <class InputIterator1, class InputIterator2, class BinaryPredicate>
  40     bool equal ( InputIterator1 first1, InputIterator1 last1,
  41                  InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred,
  42                  std::input_iterator_tag, std::input_iterator_tag )
  43     {
  44     for (; first1 != last1 && first2 != last2; ++first1, ++first2 )
  45         if ( !pred(*first1, *first2 ))
  46             return false;
  47
  48     return first1 == last1 && first2 == last2;
  49     }
  50 }
  51
  52 /// \fn equal ( InputIterator1 first1, InputIterator1 last1,
  53 ///             InputIterator2 first2, InputIterator2 last2,
  54 ///             BinaryPredicate pred )
  55 /// \return true if all elements in the two ranges are equal
  56 ///
  57 /// \param first1    The start of the first range.
  58 /// \param last1     One past the end of the first range.
  59 /// \param first2    The start of the second range.
  60 /// \param last2     One past the end of the second range.
  61 /// \param pred      A predicate for comparing the elements of the ranges
  62 template <class InputIterator1, class InputIterator2, class BinaryPredicate>
  63 bool equal ( InputIterator1 first1, InputIterator1 last1,
  64              InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred )
  65 {
  66     return boost::algorithm::detail::equal (
  67         first1, last1, first2, last2, pred,
  68         typename std::iterator_traits<InputIterator1>::iterator_category (),
  69         typename std::iterator_traits<InputIterator2>::iterator_category ());
  70 }
  71
  72 /// \fn equal ( InputIterator1 first1, InputIterator1 last1,
  73 ///             InputIterator2 first2, InputIterator2 last2 )
  74 /// \return true if all elements in the two ranges are equal
  75 ///
  76 /// \param first1    The start of the first range.
  77 /// \param last1     One past the end of the first range.
  78 /// \param first2    The start of the second range.
  79 /// \param last2     One past the end of the second range.
  80 template <class InputIterator1, class InputIterator2>
  81 bool equal ( InputIterator1 first1, InputIterator1 last1,
  82              InputIterator2 first2, InputIterator2 last2 )
  83 {
  84     return boost::algorithm::detail::equal (
  85         first1, last1, first2, last2,
  86         boost::algorithm::detail::eq<
  87             typename std::iterator_traits<InputIterator1>::value_type,
  88             typename std::iterator_traits<InputIterator2>::value_type> (),
  89         typename std::iterator_traits<InputIterator1>::iterator_category (),
  90         typename std::iterator_traits<InputIterator2>::iterator_category ());
  91 }
  92
  93 //  There are already range-based versions of these.
  94
  95 }} // namespace boost and algorithm
  96
  97 #endif // BOOST_ALGORITHM_EQUAL_HPP