Chris@16: /* 
Chris@16:    Copyright (c) Marshall Clow 2008-2012.
Chris@16: 
Chris@16:    Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16:    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: */
Chris@16: 
Chris@16: /// \file  equal.hpp
Chris@16: /// \brief Test ranges to if they are equal
Chris@16: /// \author Marshall Clow
Chris@16: 
Chris@16: #ifndef BOOST_ALGORITHM_EQUAL_HPP
Chris@16: #define BOOST_ALGORITHM_EQUAL_HPP
Chris@16: 
Chris@16: #include <algorithm>    // for std::equal
Chris@16: #include <functional>   // for std::equal_to
Chris@16: 
Chris@16: namespace boost { namespace algorithm {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16:     template <class T1, class T2>
Chris@16:     struct eq : public std::binary_function<T1, T2, bool> {
Chris@16:         bool operator () ( const T1& v1, const T2& v2 ) const { return v1 == v2 ;}
Chris@16:         };
Chris@16:     
Chris@16:     template <class RandomAccessIterator1, class RandomAccessIterator2, class BinaryPredicate>
Chris@16:     bool equal ( RandomAccessIterator1 first1, RandomAccessIterator1 last1, 
Chris@16:                  RandomAccessIterator2 first2, RandomAccessIterator2 last2, BinaryPredicate pred,
Chris@16:                  std::random_access_iterator_tag, std::random_access_iterator_tag )
Chris@16:     {
Chris@16:     //  Random-access iterators let is check the sizes in constant time
Chris@16:         if ( std::distance ( first1, last1 ) != std::distance ( first2, last2 ))
Chris@16:             return false;
Chris@16:     // If we know that the sequences are the same size, the original version is fine
Chris@16:         return std::equal ( first1, last1, first2, pred );
Chris@16:     }
Chris@16: 
Chris@16:     template <class InputIterator1, class InputIterator2, class BinaryPredicate>
Chris@16:     bool equal ( InputIterator1 first1, InputIterator1 last1, 
Chris@16:                  InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred,
Chris@16:                  std::input_iterator_tag, std::input_iterator_tag )
Chris@16:     {
Chris@16:     for (; first1 != last1 && first2 != last2; ++first1, ++first2 )
Chris@16:         if ( !pred(*first1, *first2 ))
Chris@16:             return false;
Chris@16: 
Chris@16:     return first1 == last1 && first2 == last2;
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: /// \fn equal ( InputIterator1 first1, InputIterator1 last1, 
Chris@16: ///             InputIterator2 first2, InputIterator2 last2,
Chris@16: ///             BinaryPredicate pred )
Chris@16: /// \return true if all elements in the two ranges are equal
Chris@16: /// 
Chris@16: /// \param first1    The start of the first range.
Chris@16: /// \param last1     One past the end of the first range.
Chris@16: /// \param first2    The start of the second range.
Chris@16: /// \param last2     One past the end of the second range.
Chris@16: /// \param pred      A predicate for comparing the elements of the ranges
Chris@16: template <class InputIterator1, class InputIterator2, class BinaryPredicate>
Chris@16: bool equal ( InputIterator1 first1, InputIterator1 last1, 
Chris@16:              InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred )
Chris@16: {
Chris@16:     return boost::algorithm::detail::equal ( 
Chris@16:         first1, last1, first2, last2, pred,
Chris@16:         typename std::iterator_traits<InputIterator1>::iterator_category (),
Chris@16:         typename std::iterator_traits<InputIterator2>::iterator_category ());
Chris@16: }
Chris@16: 
Chris@16: /// \fn equal ( InputIterator1 first1, InputIterator1 last1, 
Chris@16: ///             InputIterator2 first2, InputIterator2 last2 )
Chris@16: /// \return true if all elements in the two ranges are equal
Chris@16: /// 
Chris@16: /// \param first1    The start of the first range.
Chris@16: /// \param last1     One past the end of the first range.
Chris@16: /// \param first2    The start of the second range.
Chris@16: /// \param last2     One past the end of the second range.
Chris@16: template <class InputIterator1, class InputIterator2>
Chris@16: bool equal ( InputIterator1 first1, InputIterator1 last1, 
Chris@16:              InputIterator2 first2, InputIterator2 last2 )
Chris@16: {
Chris@16:     return boost::algorithm::detail::equal (
Chris@16:         first1, last1, first2, last2,
Chris@16:         boost::algorithm::detail::eq<
Chris@16:             typename std::iterator_traits<InputIterator1>::value_type,
Chris@16:             typename std::iterator_traits<InputIterator2>::value_type> (),
Chris@16:         typename std::iterator_traits<InputIterator1>::iterator_category (),
Chris@16:         typename std::iterator_traits<InputIterator2>::iterator_category ());
Chris@16: }
Chris@16: 
Chris@16: //  There are already range-based versions of these.
Chris@16: 
Chris@16: }} // namespace boost and algorithm
Chris@16: 
Chris@16: #endif // BOOST_ALGORITHM_EQUAL_HPP