79 lines
2.5 KiB
Plaintext
79 lines
2.5 KiB
Plaintext
|
// 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 MAKE_INSTANCE_DWA200296_HPP
|
||
|
|
# define MAKE_INSTANCE_DWA200296_HPP
|
||
|
|
|
||
|
|
# include <boost/python/detail/prefix.hpp>
|
||
|
|
# include <boost/python/object/instance.hpp>
|
||
|
|
# include <boost/python/converter/registered.hpp>
|
||
|
|
# include <boost/python/detail/decref_guard.hpp>
|
||
|
|
# include <boost/python/detail/none.hpp>
|
||
|
|
# include <boost/mpl/assert.hpp>
|
||
|
|
# include <boost/mpl/or.hpp>
|
||
|
|
# include <boost/type_traits/is_union.hpp>
|
||
|
|
|
||
|
|
namespace boost { namespace python { namespace objects {
|
||
|
|
|
||
|
|
template <class T, class Holder, class Derived>
|
||
|
|
struct make_instance_impl
|
||
|
|
{
|
||
|
|
typedef objects::instance<Holder> instance_t;
|
||
|
|
|
||
|
|
template <class Arg>
|
||
|
|
static inline PyObject* execute(Arg& x)
|
||
|
|
{
|
||
|
|
BOOST_MPL_ASSERT((mpl::or_<is_class<T>, is_union<T> >));
|
||
|
|
|
||
|
|
PyTypeObject* type = Derived::get_class_object(x);
|
||
|
|
|
||
|
|
if (type == 0)
|
||
|
|
return python::detail::none();
|
||
|
|
|
||
|
|
PyObject* raw_result = type->tp_alloc(
|
||
|
|
type, objects::additional_instance_size<Holder>::value);
|
||
|
|
|
||
|
|
if (raw_result != 0)
|
||
|
|
{
|
||
|
|
python::detail::decref_guard protect(raw_result);
|
||
|
|
|
||
|
|
instance_t* instance = (instance_t*)raw_result;
|
||
|
|
|
||
|
|
// construct the new C++ object and install the pointer
|
||
|
|
// in the Python object.
|
||
|
|
Derived::construct(&instance->storage, (PyObject*)instance, x)->install(raw_result);
|
||
|
|
|
||
|
|
// Note the position of the internally-stored Holder,
|
||
|
|
// for the sake of destruction
|
||
|
|
Py_SIZE(instance) = offsetof(instance_t, storage);
|
||
|
|
|
||
|
|
// Release ownership of the python object
|
||
|
|
protect.cancel();
|
||
|
|
}
|
||
|
|
return raw_result;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
template <class T, class Holder>
|
||
|
|
struct make_instance
|
||
|
|
: make_instance_impl<T, Holder, make_instance<T,Holder> >
|
||
|
|
{
|
||
|
|
template <class U>
|
||
|
|
static inline PyTypeObject* get_class_object(U&)
|
||
|
|
{
|
||
|
|
return converter::registered<T>::converters.get_class_object();
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline Holder* construct(void* storage, PyObject* instance, reference_wrapper<T const> x)
|
||
|
|
{
|
||
|
|
return new (storage) Holder(instance, x);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
}}} // namespace boost::python::object
|
||
|
|
|
||
|
|
#endif // MAKE_INSTANCE_DWA200296_HPP
|