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diff --git a/boost/fusion/iterator/detail/segmented_iterator.hpp b/boost/fusion/iterator/detail/segmented_iterator.hpp
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+++ b/boost/fusion/iterator/detail/segmented_iterator.hpp
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+/*=============================================================================
+    Copyright (c) 2011 Eric Niebler
+
+    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)
+==============================================================================*/
+#if !defined(BOOST_FUSION_SEGMENTED_ITERATOR_SEGMENTED_ITERATOR_HPP_INCLUDED)
+#define BOOST_FUSION_SEGMENTED_ITERATOR_SEGMENTED_ITERATOR_HPP_INCLUDED
+
+#include <boost/mpl/bool.hpp>
+#include <boost/fusion/sequence/intrinsic_fwd.hpp>
+#include <boost/fusion/iterator/iterator_facade.hpp>
+#include <boost/fusion/iterator/deref.hpp>
+#include <boost/fusion/iterator/deref_data.hpp>
+#include <boost/fusion/iterator/key_of.hpp>
+#include <boost/fusion/iterator/value_of.hpp>
+#include <boost/fusion/iterator/value_of_data.hpp>
+#include <boost/fusion/iterator/detail/segmented_equal_to.hpp>
+
+namespace boost { namespace fusion
+{
+    struct nil_;
+
+    namespace detail
+    {
+        template <typename Stack>
+        struct segmented_next_impl;
+    }
+
+    // A segmented iterator wraps a "context", which is a cons list
+    // of ranges, the frontmost is range over values and the rest
+    // are ranges over internal segments.
+    template <typename Context>
+    struct segmented_iterator
+      : iterator_facade<segmented_iterator<Context>, forward_traversal_tag>
+    {
+        explicit segmented_iterator(Context const& ctx)
+          : context(ctx)
+        {}
+
+        //auto deref(it)
+        //{
+        //  return deref(begin(car(it.context)))
+        //}
+        template <typename It>
+        struct deref
+        {
+            typedef
+                typename result_of::deref<
+                    typename It::context_type::car_type::begin_type
+                >::type
+            type;
+
+            static type call(It const& it)
+            {
+                return *it.context.car.first;
+            }
+        };
+
+        //auto deref_data(it)
+        //{
+        //  return deref_data(begin(car(it.context)))
+        //}
+        template <typename It>
+        struct deref_data
+        {
+            typedef
+                typename result_of::deref_data<
+                    typename It::context_type::car_type::begin_type
+                >::type
+            type;
+
+            static type call(It const& it)
+            {
+                return fusion::deref_data(it.context.car.first);
+            }
+        };
+
+        //auto key_of(it)
+        //{
+        //  return key_of(begin(car(it.context)))
+        //}
+        template <typename It>
+        struct key_of
+          : result_of::key_of<typename It::context_type::car_type::begin_type>
+        {};
+
+        //auto value_of(it)
+        //{
+        //  return value_of(begin(car(it.context)))
+        //}
+        template <typename It>
+        struct value_of
+          : result_of::value_of<typename It::context_type::car_type::begin_type>
+        {};
+
+        //auto value_of_data(it)
+        //{
+        //  return value_of_data(begin(car(it.context)))
+        //}
+        template <typename It>
+        struct value_of_data
+          : result_of::value_of_data<typename It::context_type::car_type::begin_type>
+        {};
+
+        // Compare all the segment iterators in each stack, starting with
+        // the bottom-most.
+        template <
+            typename It1
+          , typename It2
+          , int Size1 = It1::context_type::size::value
+          , int Size2 = It2::context_type::size::value
+        >
+        struct equal_to
+          : mpl::false_
+        {};
+
+        template <typename It1, typename It2, int Size>
+        struct equal_to<It1, It2, Size, Size>
+          : detail::segmented_equal_to<
+                typename It1::context_type
+              , typename It2::context_type
+            >
+        {};
+
+        template <typename It>
+        struct next
+        {
+            typedef detail::segmented_next_impl<typename It::context_type> impl;
+            typedef segmented_iterator<typename impl::type> type;
+
+            static type call(It const& it)
+            {
+                return type(impl::call(it.context));
+            }
+        };
+
+        typedef Context context_type;
+        context_type context;
+    };
+
+}}
+
+#endif