Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef INSTANCE_DWA200295_HPP
Chris@16: # define INSTANCE_DWA200295_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: # include <boost/type_traits/alignment_traits.hpp>
Chris@16: # include <cstddef>
Chris@16: 
Chris@16: namespace boost { namespace python
Chris@16: {
Chris@16:   struct BOOST_PYTHON_DECL_FORWARD instance_holder;
Chris@16: }} // namespace boost::python
Chris@16: 
Chris@16: namespace boost { namespace python { namespace objects { 
Chris@16: 
Chris@16: // Each extension instance will be one of these
Chris@16: template <class Data = char>
Chris@16: struct instance
Chris@16: {
Chris@16:     PyObject_VAR_HEAD
Chris@16:     PyObject* dict;
Chris@16:     PyObject* weakrefs; 
Chris@16:     instance_holder* objects;
Chris@16: 
Chris@16:     typedef typename type_with_alignment<
Chris@16:         ::boost::alignment_of<Data>::value
Chris@16:     >::type align_t;
Chris@16:           
Chris@16:     union
Chris@16:     {
Chris@16:         align_t align;
Chris@16:         char bytes[sizeof(Data)];
Chris@16:     } storage;
Chris@16: };
Chris@16: 
Chris@16: template <class Data>
Chris@16: struct additional_instance_size
Chris@16: {
Chris@16:     typedef instance<Data> instance_data;
Chris@16:     typedef instance<char> instance_char;
Chris@16:     BOOST_STATIC_CONSTANT(
Chris@16:         std::size_t, value = sizeof(instance_data)
Chris@16:                            - BOOST_PYTHON_OFFSETOF(instance_char,storage));
Chris@16: };
Chris@16: 
Chris@16: }}} // namespace boost::python::object
Chris@16: 
Chris@16: #endif // INSTANCE_DWA200295_HPP