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