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