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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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