diff --git a/include/ndnboost/functional/hash/extensions.hpp b/include/ndnboost/functional/hash/extensions.hpp
new file mode 100644
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--- /dev/null
+++ b/include/ndnboost/functional/hash/extensions.hpp
@@ -0,0 +1,379 @@
+
+// Copyright 2005-2009 Daniel James.
+// 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)
+
+//  Based on Peter Dimov's proposal
+//  http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
+//  issue 6.18. 
+
+// This implements the extensions to the standard.
+// It's undocumented, so you shouldn't use it....
+
+#if !defined(NDNBOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP)
+#define NDNBOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP
+
+#include <ndnboost/functional/hash/hash.hpp>
+#include <ndnboost/detail/container_fwd.hpp>
+#include <ndnboost/utility/enable_if.hpp>
+#include <ndnboost/static_assert.hpp>
+#include <ndnboost/preprocessor/repetition/repeat_from_to.hpp>
+#include <ndnboost/preprocessor/repetition/enum_params.hpp>
+
+#if !defined(NDNBOOST_NO_CXX11_HDR_ARRAY)
+#   include <array>
+#endif
+
+#if !defined(NDNBOOST_NO_CXX11_HDR_TUPLE)
+#   include <tuple>
+#endif
+
+#if !defined(NDNBOOST_NO_CXX11_HDR_MEMORY)
+#   include <memory>
+#endif
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#if defined(NDNBOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+#include <ndnboost/type_traits/is_array.hpp>
+#endif
+
+#if NDNBOOST_WORKAROUND(NDNBOOST_MSVC, < 1300)
+#include <ndnboost/type_traits/is_const.hpp>
+#endif
+
+namespace ndnboost
+{
+    template <class A, class B>
+    std::size_t hash_value(std::pair<A, B> const&);
+    template <class T, class A>
+    std::size_t hash_value(std::vector<T, A> const&);
+    template <class T, class A>
+    std::size_t hash_value(std::list<T, A> const& v);
+    template <class T, class A>
+    std::size_t hash_value(std::deque<T, A> const& v);
+    template <class K, class C, class A>
+    std::size_t hash_value(std::set<K, C, A> const& v);
+    template <class K, class C, class A>
+    std::size_t hash_value(std::multiset<K, C, A> const& v);
+    template <class K, class T, class C, class A>
+    std::size_t hash_value(std::map<K, T, C, A> const& v);
+    template <class K, class T, class C, class A>
+    std::size_t hash_value(std::multimap<K, T, C, A> const& v);
+
+    template <class T>
+    std::size_t hash_value(std::complex<T> const&);
+
+    template <class A, class B>
+    std::size_t hash_value(std::pair<A, B> const& v)
+    {
+        std::size_t seed = 0;
+        ndnboost::hash_combine(seed, v.first);
+        ndnboost::hash_combine(seed, v.second);
+        return seed;
+    }
+
+    template <class T, class A>
+    std::size_t hash_value(std::vector<T, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class T, class A>
+    std::size_t hash_value(std::list<T, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class T, class A>
+    std::size_t hash_value(std::deque<T, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class K, class C, class A>
+    std::size_t hash_value(std::set<K, C, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class K, class C, class A>
+    std::size_t hash_value(std::multiset<K, C, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class K, class T, class C, class A>
+    std::size_t hash_value(std::map<K, T, C, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class K, class T, class C, class A>
+    std::size_t hash_value(std::multimap<K, T, C, A> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+
+    template <class T>
+    std::size_t hash_value(std::complex<T> const& v)
+    {
+        ndnboost::hash<T> hasher;
+        std::size_t seed = hasher(v.imag());
+        seed ^= hasher(v.real()) + (seed<<6) + (seed>>2);
+        return seed;
+    }
+
+#if !defined(NDNBOOST_NO_CXX11_HDR_ARRAY)
+    template <class T, std::size_t N>
+    std::size_t hash_value(std::array<T, N> const& v)
+    {
+        return ndnboost::hash_range(v.begin(), v.end());
+    }
+#endif
+
+#if !defined(NDNBOOST_NO_CXX11_HDR_TUPLE)
+    namespace hash_detail {
+        template <std::size_t I, typename T>
+        inline typename ndnboost::enable_if_c<(I == std::tuple_size<T>::value),
+                void>::type
+            hash_combine_tuple(std::size_t&, T const&)
+        {
+        }
+
+        template <std::size_t I, typename T>
+        inline typename ndnboost::enable_if_c<(I < std::tuple_size<T>::value),
+                void>::type
+            hash_combine_tuple(std::size_t& seed, T const& v)
+        {
+            ndnboost::hash_combine(seed, std::get<I>(v));
+            ndnboost::hash_detail::hash_combine_tuple<I + 1>(seed, v);
+        }
+
+        template <typename T>
+        inline std::size_t hash_tuple(T const& v)
+        {
+            std::size_t seed = 0;
+            ndnboost::hash_detail::hash_combine_tuple<0>(seed, v);
+            return seed;
+        }
+    }
+
+#if !defined(NDNBOOST_NO_CXX11_VARIADIC_TEMPLATES)
+    template <typename... T>
+    inline std::size_t hash_value(std::tuple<T...> const& v)
+    {
+        return ndnboost::hash_detail::hash_tuple(v);
+    }
+#else
+
+    inline std::size_t hash_value(std::tuple<> const& v)
+    {
+        return ndnboost::hash_detail::hash_tuple(v);
+    }
+
+#   define NDNBOOST_HASH_TUPLE_F(z, n, _)                                      \
+    template<                                                               \
+        NDNBOOST_PP_ENUM_PARAMS_Z(z, n, typename A)                            \
+    >                                                                       \
+    inline std::size_t hash_value(std::tuple<                               \
+        NDNBOOST_PP_ENUM_PARAMS_Z(z, n, A)                                     \
+    > const& v)                                                             \
+    {                                                                       \
+        return ndnboost::hash_detail::hash_tuple(v);                           \
+    }
+
+    NDNBOOST_PP_REPEAT_FROM_TO(1, 11, NDNBOOST_HASH_TUPLE_F, _)
+#   undef NDNBOOST_HASH_TUPLE_F
+#endif
+
+#endif
+
+#if !defined(NDNBOOST_NO_CXX11_SMART_PTR)
+    template <typename T>
+    inline std::size_t hash_value(std::shared_ptr<T> const& x) {
+        return ndnboost::hash_value(x.get());
+    }
+
+    template <typename T, typename Deleter>
+    inline std::size_t hash_value(std::unique_ptr<T, Deleter> const& x) {
+        return ndnboost::hash_value(x.get());
+    }
+#endif
+
+    //
+    // call_hash_impl
+    //
+
+    // On compilers without function template ordering, this deals with arrays.
+
+#if defined(NDNBOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+    namespace hash_detail
+    {
+        template <bool IsArray>
+        struct call_hash_impl
+        {
+            template <class T>
+            struct inner
+            {
+                static std::size_t call(T const& v)
+                {
+                    using namespace ndnboost;
+                    return hash_value(v);
+                }
+            };
+        };
+
+        template <>
+        struct call_hash_impl<true>
+        {
+            template <class Array>
+            struct inner
+            {
+#if !NDNBOOST_WORKAROUND(NDNBOOST_MSVC, < 1300)
+                static std::size_t call(Array const& v)
+#else
+                static std::size_t call(Array& v)
+#endif
+                {
+                    const int size = sizeof(v) / sizeof(*v);
+                    return ndnboost::hash_range(v, v + size);
+                }
+            };
+        };
+
+        template <class T>
+        struct call_hash
+            : public call_hash_impl<ndnboost::is_array<T>::value>
+                ::NDNBOOST_NESTED_TEMPLATE inner<T>
+        {
+        };
+    }
+#endif // NDNBOOST_NO_FUNCTION_TEMPLATE_ORDERING
+
+    //
+    // ndnboost::hash
+    //
+
+
+#if !defined(NDNBOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+
+    template <class T> struct hash
+        : std::unary_function<T, std::size_t>
+    {
+#if !defined(NDNBOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+        std::size_t operator()(T const& val) const
+        {
+            return hash_value(val);
+        }
+#else
+        std::size_t operator()(T const& val) const
+        {
+            return hash_detail::call_hash<T>::call(val);
+        }
+#endif
+    };
+
+#if NDNBOOST_WORKAROUND(__DMC__, <= 0x848)
+    template <class T, unsigned int n> struct hash<T[n]>
+        : std::unary_function<T[n], std::size_t>
+    {
+        std::size_t operator()(const T* val) const
+        {
+            return ndnboost::hash_range(val, val+n);
+        }
+    };
+#endif
+
+#else // NDNBOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+    // On compilers without partial specialization, ndnboost::hash<T>
+    // has already been declared to deal with pointers, so just
+    // need to supply the non-pointer version of hash_impl.
+
+    namespace hash_detail
+    {
+        template <bool IsPointer>
+        struct hash_impl;
+
+#if !NDNBOOST_WORKAROUND(NDNBOOST_MSVC, < 1300)
+
+        template <>
+        struct hash_impl<false>
+        {
+            template <class T>
+            struct inner
+                : std::unary_function<T, std::size_t>
+            {
+#if !defined(NDNBOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+                std::size_t operator()(T const& val) const
+                {
+                    return hash_value(val);
+                }
+#else
+                std::size_t operator()(T const& val) const
+                {
+                    return hash_detail::call_hash<T>::call(val);
+                }
+#endif
+            };
+        };
+
+#else // Visual C++ 6.5
+
+        // Visual C++ 6.5 has problems with nested member functions and
+        // applying const to const types in templates. So we get this:
+
+        template <bool IsConst>
+        struct hash_impl_msvc
+        {
+            template <class T>
+            struct inner
+                : public std::unary_function<T, std::size_t>
+            {
+                std::size_t operator()(T const& val) const
+                {
+                    return hash_detail::call_hash<T const>::call(val);
+                }
+
+                std::size_t operator()(T& val) const
+                {
+                    return hash_detail::call_hash<T>::call(val);
+                }
+            };
+        };
+
+        template <>
+        struct hash_impl_msvc<true>
+        {
+            template <class T>
+            struct inner
+                : public std::unary_function<T, std::size_t>
+            {
+                std::size_t operator()(T& val) const
+                {
+                    return hash_detail::call_hash<T>::call(val);
+                }
+            };
+        };
+        
+        template <class T>
+        struct hash_impl_msvc2
+            : public hash_impl_msvc<ndnboost::is_const<T>::value>
+                    ::NDNBOOST_NESTED_TEMPLATE inner<T> {};
+        
+        template <>
+        struct hash_impl<false>
+        {
+            template <class T>
+            struct inner : public hash_impl_msvc2<T> {};
+        };
+
+#endif // Visual C++ 6.5
+    }
+#endif  // NDNBOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+}
+
+#endif