sl@0: // Copyright David Abrahams 2002.
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: #ifndef INSTANCE_DWA200295_HPP
sl@0: # define INSTANCE_DWA200295_HPP
sl@0: 
sl@0: # include <boost/python/detail/prefix.hpp>
sl@0: # include <boost/type_traits/alignment_traits.hpp>
sl@0: # include <cstddef>
sl@0: 
sl@0: namespace boost { namespace python
sl@0: {
sl@0:   struct BOOST_PYTHON_DECL_FORWARD instance_holder;
sl@0: }} // namespace boost::python
sl@0: 
sl@0: namespace boost { namespace python { namespace objects { 
sl@0: 
sl@0: // Each extension instance will be one of these
sl@0: template <class Data = char>
sl@0: struct instance
sl@0: {
sl@0:     PyObject_VAR_HEAD
sl@0:     PyObject* dict;
sl@0:     PyObject* weakrefs; 
sl@0:     instance_holder* objects;
sl@0: 
sl@0:     typedef typename type_with_alignment<
sl@0:         ::boost::alignment_of<Data>::value
sl@0:     >::type align_t;
sl@0:           
sl@0:     union
sl@0:     {
sl@0:         align_t align;
sl@0:         char bytes[sizeof(Data)];
sl@0:     } storage;
sl@0: };
sl@0: 
sl@0: template <class Data>
sl@0: struct additional_instance_size
sl@0: {
sl@0:     typedef instance<Data> instance_data;
sl@0:     typedef instance<char> instance_char;
sl@0:     BOOST_STATIC_CONSTANT(
sl@0:         std::size_t, value = sizeof(instance_data)
sl@0:                            - BOOST_PYTHON_OFFSETOF(instance_char,storage));
sl@0: };
sl@0: 
sl@0: }}} // namespace boost::python::object
sl@0: 
sl@0: #endif // INSTANCE_DWA200295_HPP