Added boost header

test/external/boost/python/reference_existing_object.hpp

@@ -0,0 +1,46 @@
+// Copyright David Abrahams 2002.
+// 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 REFERENCE_EXISTING_OBJECT_DWA200222_HPP
+# define REFERENCE_EXISTING_OBJECT_DWA200222_HPP
+
+# include <boost/python/detail/prefix.hpp>
+# include <boost/python/detail/indirect_traits.hpp>
+# include <boost/mpl/if.hpp>
+# include <boost/python/to_python_indirect.hpp>
+# include <boost/type_traits/composite_traits.hpp>
+
+namespace boost { namespace python { 
+
+namespace detail
+{
+  template <class R>
+  struct reference_existing_object_requires_a_pointer_or_reference_return_type
+# if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__)
+  {}
+# endif
+  ;
+}
+
+template <class T> struct to_python_value;
+
+struct reference_existing_object
+{
+    template <class T>
+    struct apply
+    {
+        BOOST_STATIC_CONSTANT(
+            bool, ok = is_pointer<T>::value || is_reference<T>::value);
+        
+        typedef typename mpl::if_c<
+            ok
+            , to_python_indirect<T, detail::make_reference_holder>
+            , detail::reference_existing_object_requires_a_pointer_or_reference_return_type<T>
+        >::type type;
+    };
+};
+
+}} // namespace boost::python
+
+#endif // REFERENCE_EXISTING_OBJECT_DWA200222_HPP