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include/boost/algorithm/is_palindrome.hpp

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+/*
+  Copyright (c) Alexander Zaitsev <zamazan4ik@gmail.com>, 2016
+
+  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)
+
+  See http://www.boost.org/ for latest version.
+*/
+
+/// \file  is_palindrome.hpp
+/// \brief Checks the input sequence on palindrome.
+/// \author Alexander Zaitsev
+
+#ifndef BOOST_ALGORITHM_is_palindrome_HPP
+#define BOOST_ALGORITHM_is_palindrome_HPP
+
+#include <iterator>
+
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+
+namespace boost {  namespace algorithm {
+
+/// \fn is_palindrome ( BidirectionalIterator begin, BidirectionalIterator end, Predicate p )
+/// \return true if the entire sequence is palindrome
+///
+/// \param begin    The start of the input sequence
+/// \param end		One past the end of the input sequence
+/// \param p        A predicate used to compare the values.
+///
+/// \note This function will return true for empty sequences and for palindromes.
+///     For other sequences function will return false.
+///     Complexity: O(N).
+template <typename BidirectionalIterator, typename Predicate>
+bool is_palindrome(BidirectionalIterator begin, BidirectionalIterator end, Predicate p)
+{
+    if(begin == end)
+    {
+        return true;
+    }
+
+    --end;
+    while(begin != end)
+    {
+        if(!p(*begin, *end))
+        {
+            return false;
+        }
+        ++begin;
+        if(begin == end)
+        {
+            break;
+        }
+        --end;
+    }
+    return true;
+}
+
+/// \fn is_palindrome ( BidirectionalIterator begin, BidirectionalIterator end )
+/// \return true if the entire sequence is palindrome
+///
+/// \param begin    The start of the input sequence
+/// \param end		One past the end of the input sequence
+///
+/// \note This function will return true for empty sequences and for palindromes.
+///     For other sequences function will return false.
+///     Complexity: O(N).
+template <typename BidirectionalIterator>
+bool is_palindrome(BidirectionalIterator begin, BidirectionalIterator end)
+{
+    return is_palindrome(begin, end,
+                         std::equal_to<typename std::iterator_traits<BidirectionalIterator>::value_type> ());
+}
+
+/// \fn is_palindrome ( const R& range )
+/// \return true if the entire sequence is palindrome
+///
+/// \param range The range to be tested.
+///
+/// \note This function will return true for empty sequences and for palindromes.
+///     For other sequences function will return false.
+///     Complexity: O(N).
+template <typename R>
+bool is_palindrome(const R& range)
+{
+    return is_palindrome(boost::begin(range), boost::end(range));
+}
+
+/// \fn is_palindrome ( const R& range, Predicate p )
+/// \return true if the entire sequence is palindrome
+///
+/// \param range The range to be tested.
+/// \param p     A predicate used to compare the values.
+///
+/// \note This function will return true for empty sequences and for palindromes.
+///     For other sequences function will return false.
+///     Complexity: O(N).
+template <typename R, typename Predicate>
+bool is_palindrome(const R& range, Predicate p)
+{
+    return is_palindrome(boost::begin(range), boost::end(range), p);
+}
+
+}}
+
+#endif // BOOST_ALGORITHM_is_palindrome_HPP