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+// Boost.Range library
+//
+//  Copyright Neil Groves 2010. Use, modification and
+//  distribution is subject to 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)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+#ifndef BOOST_RANGE_ADAPTOR_TYPE_ERASED_HPP_INCLUDED
+#define BOOST_RANGE_ADAPTOR_TYPE_ERASED_HPP_INCLUDED
+
+#include <boost/range/reference.hpp>
+#include <boost/range/value_type.hpp>
+#include <boost/range/iterator_range_core.hpp>
+#include <boost/range/any_range.hpp>
+#include <boost/range/concepts.hpp>
+
+namespace boost
+{
+    namespace adaptors
+    {
+        template<
+            class Value = use_default
+          , class Traversal = use_default
+          , class Reference = use_default
+          , class Difference = use_default
+          , class Buffer = use_default
+        >
+        struct type_erased
+        {
+        };
+
+        template<
+            class SinglePassRange
+          , class Value
+          , class Traversal
+          , class Reference
+          , class Difference
+          , class Buffer
+        >
+        typename any_range_type_generator<
+            SinglePassRange
+          , Value
+          , Traversal
+          , Reference
+          , Difference
+          , Buffer
+        >::type
+        operator|(SinglePassRange& rng,
+                  type_erased<
+                        Value
+                      , Traversal
+                      , Reference
+                      , Difference
+                      , Buffer
+                    >)
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<SinglePassRange>));
+
+            typedef typename any_range_type_generator<
+                SinglePassRange
+              , Value
+              , Traversal
+              , Reference
+              , Difference
+              , Buffer
+            >::type range_type;
+            return range_type(boost::begin(rng), boost::end(rng));
+        }
+
+        template<
+            class SinglePassRange
+          , class Value
+          , class Traversal
+          , class Reference
+          , class Difference
+          , class Buffer
+        >
+        typename any_range_type_generator<
+            const SinglePassRange
+          , Value
+          , Traversal
+          , Reference
+          , Difference
+          , Buffer
+        >::type
+        operator|(const SinglePassRange& rng,
+                  type_erased<
+                            Value
+                          , Traversal
+                          , Reference
+                          , Difference
+                          , Buffer
+                    >)
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<const SinglePassRange>));
+
+            typedef typename any_range_type_generator<
+                const SinglePassRange
+              , Value
+              , Traversal
+              , Reference
+              , Difference
+              , Buffer
+            >::type range_type;
+            return range_type(boost::begin(rng), boost::end(rng));
+        }
+
+        template<
+            class SinglePassRange
+          , class Value
+          , class Traversal
+          , class Reference
+          , class Difference
+          , class Buffer
+        >
+        typename any_range_type_generator<
+            SinglePassRange
+          , Value
+          , Traversal
+          , Reference
+          , Difference
+          , Buffer
+        >::type
+        type_erase(SinglePassRange& rng
+                 , type_erased<
+                            Value
+                          , Traversal
+                          , Reference
+                          , Difference
+                          , Buffer
+                    > = type_erased<>()
+                )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<SinglePassRange>));
+
+            typedef typename any_range_type_generator<
+                SinglePassRange
+              , Value
+              , Traversal
+              , Reference
+              , Difference
+              , Buffer
+            >::type range_type;
+
+            return range_type(boost::begin(rng), boost::end(rng));
+        }
+
+        template<
+            class SinglePassRange
+          , class Value
+          , class Traversal
+          , class Reference
+          , class Difference
+          , class Buffer
+        >
+        typename any_range_type_generator<
+            const SinglePassRange
+          , Value
+          , Traversal
+          , Reference
+          , Difference
+          , Buffer
+        >::type
+        type_erase(const SinglePassRange& rng
+                 , type_erased<
+                            Value
+                          , Traversal
+                          , Reference
+                          , Difference
+                          , Buffer
+                    > = type_erased<>()
+                )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<const SinglePassRange>));
+
+            typedef typename any_range_type_generator<
+                const SinglePassRange
+              , Value
+              , Traversal
+              , Reference
+              , Difference
+              , Buffer
+            >::type range_type;
+
+            return range_type(boost::begin(rng), boost::end(rng));
+        }
+    }
+} // namespace boost
+
+#endif // include guard