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diff --git a/boost_ext/boost/typeof/modifiers.hpp b/boost_ext/boost/typeof/modifiers.hpp
new file mode 100644
index 0000000..cfb276b
--- /dev/null
+++ b/boost_ext/boost/typeof/modifiers.hpp
@@ -0,0 +1,92 @@
+// Copyright (C) 2004 Arkadiy Vertleyb
+// 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_TYPEOF_MODIFIERS_HPP_INCLUDED
+#define BOOST_TYPEOF_MODIFIERS_HPP_INCLUDED
+
+#include <boost/typeof/encode_decode.hpp>
+#include <boost/preprocessor/facilities/identity.hpp>
+
+#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
+
+// modifiers
+
+#define BOOST_TYPEOF_modifier_support(ID, Fun)\
+    template<class V, class T> struct encode_type_impl<V, Fun(T)>\
+    {\
+        typedef\
+            typename boost::type_of::encode_type<\
+            typename boost::type_of::push_back<\
+            V\
+            , boost::mpl::size_t<ID> >::type\
+            , T>::type\
+            type;\
+    };\
+    template<class Iter> struct decode_type_impl<boost::mpl::size_t<ID>, Iter>\
+    {\
+        typedef boost::type_of::decode_type<Iter> d1;\
+        typedef Fun(typename d1::type) type;\
+        typedef typename d1::iter iter;\
+    }
+
+#define BOOST_TYPEOF_const_fun(T) const T
+#define BOOST_TYPEOF_volatile_fun(T) volatile T
+#define BOOST_TYPEOF_volatile_const_fun(T) volatile const T
+#define BOOST_TYPEOF_pointer_fun(T) T*
+#define BOOST_TYPEOF_reference_fun(T) T&
+
+BOOST_TYPEOF_BEGIN_ENCODE_NS
+
+BOOST_TYPEOF_modifier_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_TYPEOF_const_fun);
+BOOST_TYPEOF_modifier_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_TYPEOF_volatile_fun);
+BOOST_TYPEOF_modifier_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_TYPEOF_volatile_const_fun);
+BOOST_TYPEOF_modifier_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_TYPEOF_pointer_fun);
+BOOST_TYPEOF_modifier_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_TYPEOF_reference_fun);
+
+BOOST_TYPEOF_END_ENCODE_NS
+
+#undef BOOST_TYPEOF_modifier_support
+#undef BOOST_TYPEOF_const_fun
+#undef BOOST_TYPEOF_volatile_fun
+#undef BOOST_TYPEOF_volatile_const_fun
+#undef BOOST_TYPEOF_pointer_fun
+#undef BOOST_TYPEOF_reference_fun
+
+// arrays
+
+#define BOOST_TYPEOF_array_support(ID, Qualifier)\
+    template<class V, class T, int N>\
+    struct encode_type_impl<V, Qualifier() T[N]>\
+    {\
+        typedef\
+            typename boost::type_of::encode_type<\
+            typename boost::type_of::push_back<\
+            typename boost::type_of::push_back<\
+            V\
+            , boost::mpl::size_t<ID> >::type\
+            , boost::mpl::size_t<N> >::type\
+            , T>::type\
+        type;\
+    };\
+    template<class Iter>\
+    struct decode_type_impl<boost::mpl::size_t<ID>, Iter>\
+    {\
+        enum{n = Iter::type::value};\
+        typedef boost::type_of::decode_type<typename Iter::next> d;\
+        typedef typename d::type Qualifier() type[n];\
+        typedef typename d::iter iter;\
+    }
+
+BOOST_TYPEOF_BEGIN_ENCODE_NS
+
+BOOST_TYPEOF_array_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_PP_EMPTY);
+BOOST_TYPEOF_array_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_PP_IDENTITY(const));
+BOOST_TYPEOF_array_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_PP_IDENTITY(volatile));
+BOOST_TYPEOF_array_support(BOOST_TYPEOF_UNIQUE_ID(), BOOST_PP_IDENTITY(volatile const));
+
+BOOST_TYPEOF_END_ENCODE_NS
+
+#undef BOOST_TYPEOF_array_support
+
+#endif//BOOST_TYPEOF_MODIFIERS_HPP_INCLUDED