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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)
#include <boost/python/object/life_support.hpp>
#include <boost/python/detail/none.hpp>
#include <boost/python/refcount.hpp>
namespace boost { namespace python { namespace objects {
struct life_support
{
PyObject_HEAD
PyObject* patient;
};
extern "C"
{
static void
life_support_dealloc(PyObject* self)
{
Py_XDECREF(((life_support*)self)->patient);
self->ob_type->tp_free(self);
}
static PyObject *
life_support_call(PyObject *self, PyObject *arg, PyObject * /*kw*/)
{
// Let the patient die now
Py_XDECREF(((life_support*)self)->patient);
((life_support*)self)->patient = 0;
// Let the weak reference die. This probably kills us.
Py_XDECREF(PyTuple_GET_ITEM(arg, 0));
return ::boost::python::detail::none();
}
}
PyTypeObject life_support_type = {
PyVarObject_HEAD_INIT(NULL, 0)//(&PyType_Type)
const_cast<char*>("Boost.Python.life_support"),
sizeof(life_support),
0,
life_support_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, //(reprfunc)func_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
life_support_call, /* tp_call */
0, /* tp_str */
0, // PyObject_GenericGetAttr, /* tp_getattro */
0, // PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT /* | Py_TPFLAGS_HAVE_GC */,/* tp_flags */
0, /* tp_doc */
0, // (traverseproc)func_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, //offsetof(PyLife_SupportObject, func_weakreflist), /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, // func_memberlist, /* tp_members */
0, //func_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, //offsetof(PyLife_SupportObject, func_dict), /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
#if PYTHON_API_VERSION >= 1012
0 /* tp_del */
#endif
};
PyObject* make_nurse_and_patient(PyObject* nurse, PyObject* patient)
{
if (nurse == Py_None || nurse == patient)
return nurse;
if (Py_TYPE(&life_support_type) == 0)
{
Py_TYPE(&life_support_type) = &PyType_Type;
PyType_Ready(&life_support_type);
}
life_support* system = PyObject_New(life_support, &life_support_type);
if (!system)
return 0;
system->patient = 0;
// We're going to leak this reference, but don't worry; the
// life_support system decrements it when the nurse dies.
PyObject* weakref = PyWeakref_NewRef(nurse, (PyObject*)system);
// weakref has either taken ownership, or we have to release it
// anyway
Py_DECREF(system);
if (!weakref)
return 0;
system->patient = patient;
Py_XINCREF(patient); // hang on to the patient until death
return weakref;
}
}}} // namespace boost::python::objects
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