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diff --git a/boost/type_erasure/detail/storage.hpp b/boost/type_erasure/detail/storage.hpp
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+++ b/boost/type_erasure/detail/storage.hpp
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+// Boost.TypeErasure library
+//
+// Copyright 2011 Steven Watanabe
+//
+// 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)
+//
+// $Id$
+
+#ifndef BOOST_TYPE_ERASURE_DETAIL_STORAGE_HPP_INCLUDED
+#define BOOST_TYPE_ERASURE_DETAIL_STORAGE_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/type_traits/remove_cv.hpp>
+
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4521)
+#endif
+
+namespace boost {
+namespace type_erasure {
+namespace detail {
+
+struct storage
+{
+    storage() {}
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+    storage(storage& other) : data(other.data) {}
+    storage(const storage& other) : data(other.data) {}
+    storage(storage&& other) : data(other.data) {}
+    storage& operator=(const storage& other) { data = other.data; return *this; }
+    template<class T>
+    storage(T&& arg) : data(new typename remove_cv<
+        typename remove_reference<T>::type>::type(std::forward<T>(arg))) {}
+#else
+    template<class T>
+    storage(const T& arg) : data(new T(arg)) {}
+#endif
+    void* data;
+};
+
+
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+
+template<class T>
+T extract(T arg) { return std::forward<T>(arg); }
+
+#else
+
+template<class T>
+T extract(T arg) { return arg; }
+
+#endif
+
+template<class T>
+T extract(storage& arg)
+{
+    return *static_cast<typename ::boost::remove_reference<T>::type*>(arg.data);
+}
+
+template<class T>
+T extract(const storage& arg)
+{
+    return *static_cast<const typename ::boost::remove_reference<T>::type*>(arg.data);
+}
+
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+
+template<class T>
+T extract(storage&& arg)
+{
+    return std::move(*static_cast<typename ::boost::remove_reference<T>::type*>(arg.data));
+}
+
+#endif
+
+}
+}
+}
+
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+#endif