#include "Python.h"  #define GET_WEAKREFS_LISTPTR(o) \        ((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))  PyDoc_STRVAR(weakref_getweakrefcount__doc__,"getweakrefcount(object) -- return the number of weak references\n""to 'object'."); static PyObject *weakref_getweakrefcount(PyObject *self, PyObject *object){    PyObject *result = NULL;     if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {        PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);         result = PyInt_FromSsize_t(_PyWeakref_GetWeakrefCount(*list));    }    else        result = PyInt_FromLong(0);     return result;}  PyDoc_STRVAR(weakref_getweakrefs__doc__,"getweakrefs(object) -- return a list of all weak reference objects\n""that point to 'object'."); static PyObject *weakref_getweakrefs(PyObject *self, PyObject *object){    PyObject *result = NULL;     if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {        PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);        Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);         result = PyList_New(count);        if (result != NULL) {            PyWeakReference *current = *list;            Py_ssize_t i;            for (i = 0; i < count; ++i) {                PyList_SET_ITEM(result, i, (PyObject *) current);                Py_INCREF(current);                current = current->wr_next;            }        }    }    else {        result = PyList_New(0);    }    return result;}  PyDoc_STRVAR(weakref_proxy__doc__,"proxy(object[, callback]) -- create a proxy object that weakly\n""references 'object'.  'callback', if given, is called with a\n""reference to the proxy when 'object' is about to be finalized."); static PyObject *weakref_proxy(PyObject *self, PyObject *args){    PyObject *object;    PyObject *callback = NULL;    PyObject *result = NULL;     if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) {        result = PyWeakref_NewProxy(object, callback);    }    return result;}  static PyMethodDefweakref_functions[] =  {    {"getweakrefcount", weakref_getweakrefcount,        METH_O,     weakref_getweakrefcount__doc__},    {"getweakrefs",     weakref_getweakrefs,            METH_O,     weakref_getweakrefs__doc__},    {"proxy",           weakref_proxy,                  METH_VARARGS,     weakref_proxy__doc__},    {NULL, NULL, 0, NULL}};  PyMODINIT_FUNCinit_weakref(void){    PyObject *m;     m = Py_InitModule3("_weakref", weakref_functions,                       "Weak-reference support module.");    if (m != NULL) {        Py_INCREF(&_PyWeakref_RefType);        PyModule_AddObject(m, "ref",                           (PyObject *) &_PyWeakref_RefType);        Py_INCREF(&_PyWeakref_RefType);        PyModule_AddObject(m, "ReferenceType",                           (PyObject *) &_PyWeakref_RefType);        Py_INCREF(&_PyWeakref_ProxyType);        PyModule_AddObject(m, "ProxyType",                           (PyObject *) &_PyWeakref_ProxyType);        Py_INCREF(&_PyWeakref_CallableProxyType);        PyModule_AddObject(m, "CallableProxyType",                           (PyObject *) &_PyWeakref_CallableProxyType);    }}