Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+// 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 RETURN_INTERNAL_REFERENCE_DWA2002131_HPP
+# define RETURN_INTERNAL_REFERENCE_DWA2002131_HPP
+
+# include <boost/python/detail/prefix.hpp>
+
+# include <boost/python/default_call_policies.hpp>
+# include <boost/python/reference_existing_object.hpp>
+# include <boost/python/with_custodian_and_ward.hpp>
+# include <boost/mpl/if.hpp>
+
+namespace boost { namespace python { 
+
+namespace detail
+{
+  template <std::size_t>
+  struct return_internal_reference_owner_arg_must_be_greater_than_zero
+# if defined(__GNUC__) || defined(__EDG__)
+  {}
+# endif
+  ;
+}
+
+template <std::size_t owner_arg = 1, class BasePolicy_ = default_call_policies>
+struct return_internal_reference
+    : with_custodian_and_ward_postcall<0, owner_arg, BasePolicy_>
+{
+ private:
+    BOOST_STATIC_CONSTANT(bool, legal = owner_arg > 0);
+ public:
+    typedef typename mpl::if_c<
+        legal
+        , reference_existing_object
+        , detail::return_internal_reference_owner_arg_must_be_greater_than_zero<owner_arg>
+    >::type result_converter;
+};
+
+}} // namespace boost::python
+
+#endif // RETURN_INTERNAL_REFERENCE_DWA2002131_HPP