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+//  (C) Copyright John Maddock & Thorsten Ottosen 2005.
+//  Use, modification and distribution are 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).
+//
+//  See http://www.boost.org/libs/type_traits for most recent version including documentation.
+
+
+#ifndef BOOST_TT_DECAY_HPP_INCLUDED
+#define BOOST_TT_DECAY_HPP_INCLUDED
+
+#include <boost/type_traits/is_array.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/remove_bounds.hpp>
+#include <boost/type_traits/add_pointer.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/type_traits/remove_cv.hpp>
+
+namespace boost 
+{
+
+   namespace detail
+   {
+
+      template <class T, bool Array, bool Function> struct decay_imp { typedef typename remove_cv<T>::type type; };
+      template <class T> struct decay_imp<T, true, false> { typedef typename remove_bounds<T>::type* type; };
+      template <class T> struct decay_imp<T, false, true> { typedef T* type; };
+
+   }
+
+    template< class T >
+    struct decay
+    {
+    private:
+        typedef typename remove_reference<T>::type Ty;
+    public:
+       typedef typename boost::detail::decay_imp<Ty, boost::is_array<Ty>::value, boost::is_function<Ty>::value>::type type;
+    };
+    
+} // namespace boost
+
+
+#endif // BOOST_TT_DECAY_HPP_INCLUDED