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+#ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
+#define BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
+
+//
+//  Copyright 2015 Peter Dimov
+//
+//  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
+//
+
+#include <boost/type_traits/detail/composite_pointer_type.hpp>
+#include <boost/type_traits/remove_pointer.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/type_traits/conditional.hpp>
+#include <boost/config.hpp>
+#include <cstddef>
+
+namespace boost
+{
+
+namespace type_traits_detail
+{
+
+template<class T, class U> struct composite_member_pointer_type;
+
+// nullptr_t
+
+#if !defined( BOOST_NO_CXX11_NULLPTR )
+
+#if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
+
+template<class C, class T> struct composite_member_pointer_type<T C::*, decltype(nullptr)>
+{
+    typedef T C::* type;
+};
+
+template<class C, class T> struct composite_member_pointer_type<decltype(nullptr), T C::*>
+{
+    typedef T C::* type;
+};
+
+template<> struct composite_member_pointer_type<decltype(nullptr), decltype(nullptr)>
+{
+    typedef decltype(nullptr) type;
+};
+
+#else
+
+template<class C, class T> struct composite_member_pointer_type<T C::*, std::nullptr_t>
+{
+    typedef T C::* type;
+};
+
+template<class C, class T> struct composite_member_pointer_type<std::nullptr_t, T C::*>
+{
+    typedef T C::* type;
+};
+
+template<> struct composite_member_pointer_type<std::nullptr_t, std::nullptr_t>
+{
+    typedef std::nullptr_t type;
+};
+
+#endif
+
+#endif // !defined( BOOST_NO_CXX11_NULLPTR )
+
+template<class C1, class C2> struct common_member_class;
+
+template<class C> struct common_member_class<C, C>
+{
+    typedef C type;
+};
+
+template<class C1, class C2> struct common_member_class
+{
+    typedef typename boost::conditional<
+
+        boost::is_base_of<C1, C2>::value,
+        C2,
+        typename boost::conditional<boost::is_base_of<C2, C1>::value, C1, void>::type
+
+    >::type type;
+};
+
+//This indirection avoids compilation errors on some older 
+//compilers like MSVC 7.1
+template<class CT, class CB>
+struct common_member_class_pointer_to_member
+{
+    typedef CT CB::* type;
+};
+
+template<class C1, class T1, class C2, class T2> struct composite_member_pointer_type<T1 C1::*, T2 C2::*>
+{
+private:
+
+    typedef typename composite_pointer_type<T1*, T2*>::type CPT;
+    typedef typename boost::remove_pointer<CPT>::type CT;
+
+    typedef typename common_member_class<C1, C2>::type CB;
+
+public:
+
+    typedef typename common_member_class_pointer_to_member<CT, CB>::type type;
+};
+
+} // namespace type_traits_detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED