整理

include/boost/algorithm/cxx14/equal.hpp

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+/* 
+   Copyright (c) Marshall Clow 2008-2012.
+
+   Distributed under the Boost Software License, Version 1.0. (See accompanying
+   file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+/// \file  equal.hpp
+/// \brief Test ranges to if they are equal
+/// \author Marshall Clow
+
+#ifndef BOOST_ALGORITHM_EQUAL_HPP
+#define BOOST_ALGORITHM_EQUAL_HPP
+
+#include <iterator>
+
+#include <boost/config.hpp>
+
+namespace boost { namespace algorithm {
+
+namespace detail {
+
+    template <class T1, class T2>
+    struct eq {
+        BOOST_CONSTEXPR bool operator () ( const T1& v1, const T2& v2 ) const { return v1 == v2 ;}
+        };
+    
+    template <class RandomAccessIterator1, class RandomAccessIterator2, class BinaryPredicate>
+    BOOST_CXX14_CONSTEXPR
+    bool equal ( RandomAccessIterator1 first1, RandomAccessIterator1 last1, 
+                 RandomAccessIterator2 first2, RandomAccessIterator2 last2, BinaryPredicate pred,
+                 std::random_access_iterator_tag, std::random_access_iterator_tag )
+    {
+    //  Random-access iterators let is check the sizes in constant time
+        if ( std::distance ( first1, last1 ) != std::distance ( first2, last2 ))
+            return false;
+
+    //  std::equal
+        for (; first1 != last1; ++first1, ++first2)
+            if (!pred(*first1, *first2))
+                return false;
+        return true;
+    }
+
+    template <class InputIterator1, class InputIterator2, class BinaryPredicate>
+    BOOST_CXX14_CONSTEXPR
+    bool equal ( InputIterator1 first1, InputIterator1 last1, 
+                 InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred,
+                 std::input_iterator_tag, std::input_iterator_tag )
+    {
+    for (; first1 != last1 && first2 != last2; ++first1, ++first2 )
+        if ( !pred(*first1, *first2 ))
+            return false;
+
+    return first1 == last1 && first2 == last2;
+    }
+}
+
+/// \fn equal ( InputIterator1 first1, InputIterator1 last1, 
+///             InputIterator2 first2, InputIterator2 last2,
+///             BinaryPredicate pred )
+/// \return true if all elements in the two ranges are equal
+/// 
+/// \param first1    The start of the first range.
+/// \param last1     One past the end of the first range.
+/// \param first2    The start of the second range.
+/// \param last2     One past the end of the second range.
+/// \param pred      A predicate for comparing the elements of the ranges
+template <class InputIterator1, class InputIterator2, class BinaryPredicate>
+BOOST_CXX14_CONSTEXPR
+bool equal ( InputIterator1 first1, InputIterator1 last1, 
+             InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred )
+{
+    return boost::algorithm::detail::equal ( 
+        first1, last1, first2, last2, pred,
+        typename std::iterator_traits<InputIterator1>::iterator_category (),
+        typename std::iterator_traits<InputIterator2>::iterator_category ());
+}
+
+/// \fn equal ( InputIterator1 first1, InputIterator1 last1, 
+///             InputIterator2 first2, InputIterator2 last2 )
+/// \return true if all elements in the two ranges are equal
+/// 
+/// \param first1    The start of the first range.
+/// \param last1     One past the end of the first range.
+/// \param first2    The start of the second range.
+/// \param last2     One past the end of the second range.
+template <class InputIterator1, class InputIterator2>
+BOOST_CXX14_CONSTEXPR
+bool equal ( InputIterator1 first1, InputIterator1 last1, 
+             InputIterator2 first2, InputIterator2 last2 )
+{
+    return boost::algorithm::detail::equal (
+        first1, last1, first2, last2,
+        boost::algorithm::detail::eq<
+            typename std::iterator_traits<InputIterator1>::value_type,
+            typename std::iterator_traits<InputIterator2>::value_type> (),
+        typename std::iterator_traits<InputIterator1>::iterator_category (),
+        typename std::iterator_traits<InputIterator2>::iterator_category ());
+}
+
+//  There are already range-based versions of these.
+
+}} // namespace boost and algorithm
+
+#endif // BOOST_ALGORITHM_EQUAL_HPP

include/boost/algorithm/cxx14/is_permutation.hpp

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+/*
+   Copyright (c) Marshall Clow 2014.
+
+   Distributed under the Boost Software License, Version 1.0. (See accompanying
+   file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+/// \file  is_permutation.hpp
+/// \brief Is a sequence a permutation of another sequence (four iterator versions)
+/// \author Marshall Clow
+
+#ifndef BOOST_ALGORITHM_IS_PERMUTATION14_HPP
+#define BOOST_ALGORITHM_IS_PERMUTATION14_HPP
+
+#include <utility>      // for std::pair
+#include <functional>   // for std::equal_to
+#include <iterator>
+
+#include <boost/config.hpp>
+#include <boost/algorithm/cxx11/is_permutation.hpp>
+#include <boost/algorithm/cxx14/mismatch.hpp>
+
+namespace boost { namespace algorithm {
+
+/// \fn is_permutation ( ForwardIterator1 first, ForwardIterator1 last, 
+///                      ForwardIterator2 first2, ForwardIterator2 last2 )
+/// \brief Tests to see if the sequence [first,last) is a permutation of the sequence starting at first2
+///
+/// \param first1   The start of the input sequence
+/// \param last2    One past the end of the input sequence
+/// \param first2   The start of the second sequence
+/// \param last1    One past the end of the second sequence
+/// \note           This function is part of the C++2014 standard library.
+template< class ForwardIterator1, class ForwardIterator2 >
+bool is_permutation ( ForwardIterator1 first1, ForwardIterator1 last1, 
+                      ForwardIterator2 first2, ForwardIterator2 last2 )
+{
+//  How should I deal with the idea that ForwardIterator1::value_type
+//  and ForwardIterator2::value_type could be different? Define my own comparison predicate?
+    std::pair<ForwardIterator1, ForwardIterator2> eq = boost::algorithm::mismatch
+        ( first1, last1, first2, last2 );
+    if ( eq.first == last1 && eq.second == last2)
+        return true;
+    return boost::algorithm::detail::is_permutation_tag (
+        eq.first, last1, eq.second, last2, 
+        std::equal_to<typename std::iterator_traits<ForwardIterator1>::value_type> (),
+        typename std::iterator_traits<ForwardIterator1>::iterator_category (),
+        typename std::iterator_traits<ForwardIterator2>::iterator_category ());
+}
+
+/// \fn is_permutation ( ForwardIterator1 first, ForwardIterator1 last, 
+///                      ForwardIterator2 first2, ForwardIterator2 last2, 
+///                      BinaryPredicate p )
+/// \brief Tests to see if the sequence [first,last) is a permutation of the sequence starting at first2
+///
+/// \param first1   The start of the input sequence
+/// \param last1    One past the end of the input sequence
+/// \param first2   The start of the second sequence
+/// \param last2    One past the end of the second sequence
+/// \param pred     The predicate to compare elements with
+///
+/// \note           This function is part of the C++2014 standard library.
+template< class ForwardIterator1, class ForwardIterator2, class BinaryPredicate >
+bool is_permutation ( ForwardIterator1 first1, ForwardIterator1 last1,
+                      ForwardIterator2 first2, ForwardIterator2 last2, 
+                      BinaryPredicate pred )
+{
+    std::pair<ForwardIterator1, ForwardIterator2> eq = boost::algorithm::mismatch
+        ( first1, last1, first2, last2, pred );
+    if ( eq.first == last1 && eq.second == last2)
+        return true;
+    return boost::algorithm::detail::is_permutation_tag (
+        first1, last1, first2, last2, pred, 
+        typename std::iterator_traits<ForwardIterator1>::iterator_category (),
+        typename std::iterator_traits<ForwardIterator2>::iterator_category ());
+}
+
+}}
+
+#endif  // BOOST_ALGORITHM_IS_PERMUTATION14_HPP

include/boost/algorithm/cxx14/mismatch.hpp

@@ -0,0 +1,66 @@
+/* 
+   Copyright (c) Marshall Clow 2008-2012.
+
+   Distributed under the Boost Software License, Version 1.0. (See accompanying
+   file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+/// \file  mismatch.hpp
+/// \brief Find the first mismatched element in a sequence
+/// \author Marshall Clow
+
+#ifndef BOOST_ALGORITHM_MISMATCH_HPP
+#define BOOST_ALGORITHM_MISMATCH_HPP
+
+#include <utility>      // for std::pair
+
+#include <boost/config.hpp>
+
+namespace boost { namespace algorithm {
+
+/// \fn mismatch ( InputIterator1 first1, InputIterator1 last1, 
+///                InputIterator2 first2, InputIterator2 last2,
+///                BinaryPredicate pred )
+/// \return a pair of iterators pointing to the first elements in the sequence that do not match
+/// 
+/// \param first1    The start of the first range.
+/// \param last1     One past the end of the first range.
+/// \param first2    The start of the second range.
+/// \param last2     One past the end of the second range.
+/// \param pred      A predicate for comparing the elements of the ranges
+template <class InputIterator1, class InputIterator2, class BinaryPredicate>
+BOOST_CXX14_CONSTEXPR std::pair<InputIterator1, InputIterator2> mismatch (
+                    InputIterator1 first1, InputIterator1 last1,
+                    InputIterator2 first2, InputIterator2 last2,
+                    BinaryPredicate pred )
+{
+    for (; first1 != last1 && first2 != last2; ++first1, ++first2)
+        if ( !pred ( *first1, *first2 ))
+            break;
+    return std::pair<InputIterator1, InputIterator2>(first1, first2);
+}
+
+/// \fn mismatch ( InputIterator1 first1, InputIterator1 last1, 
+///                InputIterator2 first2, InputIterator2 last2 )
+/// \return a pair of iterators pointing to the first elements in the sequence that do not match
+/// 
+/// \param first1    The start of the first range.
+/// \param last1     One past the end of the first range.
+/// \param first2    The start of the second range.
+/// \param last2     One past the end of the second range.
+template <class InputIterator1, class InputIterator2>
+BOOST_CXX14_CONSTEXPR std::pair<InputIterator1, InputIterator2> mismatch (
+                    InputIterator1 first1, InputIterator1 last1,
+                    InputIterator2 first2, InputIterator2 last2 )
+{
+    for (; first1 != last1 && first2 != last2; ++first1, ++first2)
+        if ( *first1 != *first2 )
+            break;
+    return std::pair<InputIterator1, InputIterator2>(first1, first2);
+}
+
+//  There are already range-based versions of these.
+
+}} // namespace boost and algorithm
+
+#endif // BOOST_ALGORITHM_MISMATCH_HPP