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diff --git a/boost/type_traits/detail/is_function_cxx_03.hpp b/boost/type_traits/detail/is_function_cxx_03.hpp
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+
+//  Copyright 2000 John Maddock (john@johnmaddock.co.uk)
+//  Copyright 2002 Aleksey Gurtovoy (agurtovoy@meta-comm.com)
+//
+//  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_IS_FUNCTION_CXX_03_HPP_INCLUDED
+#define BOOST_TT_IS_FUNCTION_CXX_03_HPP_INCLUDED
+
+#include <boost/type_traits/is_reference.hpp>
+
+#if !defined(BOOST_TT_TEST_MS_FUNC_SIGS)
+#   include <boost/type_traits/detail/is_function_ptr_helper.hpp>
+#else
+#   include <boost/type_traits/detail/is_function_ptr_tester.hpp>
+#   include <boost/type_traits/detail/yes_no_type.hpp>
+#endif
+
+// is a type a function?
+// Please note that this implementation is unnecessarily complex:
+// we could just use !is_convertible<T*, const volatile void*>::value,
+// except that some compilers erroneously allow conversions from
+// function pointers to void*.
+
+namespace boost {
+
+#if !defined( __CODEGEARC__ )
+
+namespace detail {
+
+#if !defined(BOOST_TT_TEST_MS_FUNC_SIGS)
+template<bool is_ref = true>
+struct is_function_chooser
+{
+   template< typename T > struct result_
+      : public false_type {};
+};
+
+template <>
+struct is_function_chooser<false>
+{
+    template< typename T > struct result_
+        : public ::boost::type_traits::is_function_ptr_helper<T*> {};
+};
+
+template <typename T>
+struct is_function_impl
+    : public is_function_chooser< ::boost::is_reference<T>::value >
+        ::BOOST_NESTED_TEMPLATE result_<T>
+{
+};
+
+#else
+
+template <typename T>
+struct is_function_impl
+{
+#if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000)
+#pragma warning(push)
+#pragma warning(disable:6334)
+#endif
+    static T* t;
+    BOOST_STATIC_CONSTANT(
+        bool, value = sizeof(::boost::type_traits::is_function_ptr_tester(t))
+        == sizeof(::boost::type_traits::yes_type)
+        );
+#if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000)
+#pragma warning(pop)
+#endif
+};
+
+template <typename T>
+struct is_function_impl<T&> : public false_type
+{};
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+template <typename T>
+struct is_function_impl<T&&> : public false_type
+{};
+#endif
+
+#endif
+
+} // namespace detail
+
+#endif // !defined( __CODEGEARC__ )
+
+#if defined( __CODEGEARC__ )
+template <class T> struct is_function : integral_constant<bool, __is_function(T)> {};
+#else
+template <class T> struct is_function : integral_constant<bool, ::boost::detail::is_function_impl<T>::value> {};
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+template <class T> struct is_function<T&&> : public false_type {};
+#endif
+#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1600)
+template <class T> struct is_function<T&> : public false_type {};
+#endif
+#endif
+} // namespace boost
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, <= 1700)
+#include <boost/type_traits/detail/is_function_msvc10_fix.hpp>
+#endif
+
+#endif // BOOST_TT_IS_FUNCTION_CXX_03_HPP_INCLUDED