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diff --git a/boost/accumulators/statistics/times2_iterator.hpp b/boost/accumulators/statistics/times2_iterator.hpp
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+++ b/boost/accumulators/statistics/times2_iterator.hpp
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+///////////////////////////////////////////////////////////////////////////////
+// times2_iterator.hpp
+//
+//  Copyright 2006 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)
+
+#ifndef BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006
+#define BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006
+
+#include <functional>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/iterator/transform_iterator.hpp>
+#include <boost/iterator/counting_iterator.hpp>
+#include <boost/iterator/permutation_iterator.hpp>
+
+namespace boost { namespace accumulators
+{
+
+namespace detail
+{
+    typedef transform_iterator<
+        std::binder1st<std::multiplies<std::size_t> >
+      , counting_iterator<std::size_t>
+    > times2_iterator;
+
+    inline times2_iterator make_times2_iterator(std::size_t i)
+    {
+        return make_transform_iterator(
+            make_counting_iterator(i)
+          , std::bind1st(std::multiplies<std::size_t>(), 2)
+        );
+    }
+
+
+    ///////////////////////////////////////////////////////////////////////////////
+    // lvalue_index_iterator
+    template<typename Base>
+    struct lvalue_index_iterator
+      : Base
+    {
+        lvalue_index_iterator(Base base)
+          : Base(base)
+        {
+        }
+
+        typename Base::reference operator [](typename Base::difference_type n) const
+        {
+            return *(*this + n);
+        }
+    };
+} // namespace detail
+
+}}
+
+#endif