ceph/src/boost/boost/algorithm/cxx14/mismatch.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  mismatch.hpp
   9 /// \brief Find the first mismatched element in a sequence
  10 /// \author Marshall Clow
  11
  12 #ifndef BOOST_ALGORITHM_MISMATCH_HPP
  13 #define BOOST_ALGORITHM_MISMATCH_HPP
  14
  15 #include <utility>      // for std::pair
  16
  17 #include <boost/config.hpp>
  18
  19 namespace boost { namespace algorithm {
  20
  21 /// \fn mismatch ( InputIterator1 first1, InputIterator1 last1,
  22 ///                InputIterator2 first2, InputIterator2 last2,
  23 ///                BinaryPredicate pred )
  24 /// \return a pair of iterators pointing to the first elements in the sequence that do not match
  25 ///
  26 /// \param first1    The start of the first range.
  27 /// \param last1     One past the end of the first range.
  28 /// \param first2    The start of the second range.
  29 /// \param last2     One past the end of the second range.
  30 /// \param pred      A predicate for comparing the elements of the ranges
  31 template <class InputIterator1, class InputIterator2, class BinaryPredicate>
  32 BOOST_CXX14_CONSTEXPR std::pair<InputIterator1, InputIterator2> mismatch (
  33                     InputIterator1 first1, InputIterator1 last1,
  34                     InputIterator2 first2, InputIterator2 last2,
  35                     BinaryPredicate pred )
  36 {
  37     for (; first1 != last1 && first2 != last2; ++first1, ++first2)
  38         if ( !pred ( *first1, *first2 ))
  39             break;
  40     return std::pair<InputIterator1, InputIterator2>(first1, first2);
  41 }
  42
  43 /// \fn mismatch ( InputIterator1 first1, InputIterator1 last1,
  44 ///                InputIterator2 first2, InputIterator2 last2 )
  45 /// \return a pair of iterators pointing to the first elements in the sequence that do not match
  46 ///
  47 /// \param first1    The start of the first range.
  48 /// \param last1     One past the end of the first range.
  49 /// \param first2    The start of the second range.
  50 /// \param last2     One past the end of the second range.
  51 template <class InputIterator1, class InputIterator2>
  52 BOOST_CXX14_CONSTEXPR std::pair<InputIterator1, InputIterator2> mismatch (
  53                     InputIterator1 first1, InputIterator1 last1,
  54                     InputIterator2 first2, InputIterator2 last2 )
  55 {
  56     for (; first1 != last1 && first2 != last2; ++first1, ++first2)
  57         if ( *first1 != *first2 )
  58             break;
  59     return std::pair<InputIterator1, InputIterator2>(first1, first2);
  60 }
  61
  62 //  There are already range-based versions of these.
  63
  64 }} // namespace boost and algorithm
  65
  66 #endif // BOOST_ALGORITHM_MISMATCH_HPP