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