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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 INSTANCE_DWA200295_HPP

# define INSTANCE_DWA200295_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/type_traits/alignment_traits.hpp>

# include <cstddef>

namespace boost { namespace python

{

struct BOOST_PYTHON_DECL_FORWARD instance_holder;

}} // namespace boost::python

namespace boost { namespace python { namespace objects {

// Each extension instance will be one of these

template <class Data = char>

struct instance

{

PyObject_VAR_HEAD

PyObject* dict;

PyObject* weakrefs;

instance_holder* objects;

typedef typename type_with_alignment<

::boost::alignment_of<Data>::value

>::type align_t;

union

{

align_t align;

char bytes[sizeof(Data)];

} storage;

};

template <class Data>

struct additional_instance_size

{

typedef instance<Data> instance_data;

typedef instance<char> instance_char;

BOOST_STATIC_CONSTANT(

std::size_t, value = sizeof(instance_data)

- BOOST_PYTHON_OFFSETOF(instance_char,storage));

};

}}} // namespace boost::python::object

#endif // INSTANCE_DWA200295_HPP

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