1#define PY_SSIZE_T_CLEAN 2#include <Python.h> 3 4typedef struct { 5 PyListObject list; 6 int state; 7} SubListObject; 8 9static PyObject * 10SubList_increment(SubListObject *self, PyObject *unused) 11{ 12 self->state++; 13 return PyLong_FromLong(self->state); 14} 15 16static PyMethodDef SubList_methods[] = { 17 {"increment", (PyCFunction) SubList_increment, METH_NOARGS, 18 PyDoc_STR("increment state counter")}, 19 {NULL}, 20}; 21 22static int 23SubList_init(SubListObject *self, PyObject *args, PyObject *kwds) 24{ 25 if (PyList_Type.tp_init((PyObject *) self, args, kwds) < 0) 26 return -1; 27 self->state = 0; 28 return 0; 29} 30 31static PyTypeObject SubListType = { 32 PyVarObject_HEAD_INIT(NULL, 0) 33 .tp_name = "sublist.SubList", 34 .tp_doc = PyDoc_STR("SubList objects"), 35 .tp_basicsize = sizeof(SubListObject), 36 .tp_itemsize = 0, 37 .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, 38 .tp_init = (initproc) SubList_init, 39 .tp_methods = SubList_methods, 40}; 41 42static PyModuleDef sublistmodule = { 43 PyModuleDef_HEAD_INIT, 44 .m_name = "sublist", 45 .m_doc = "Example module that creates an extension type.", 46 .m_size = -1, 47}; 48 49PyMODINIT_FUNC 50PyInit_sublist(void) 51{ 52 PyObject *m; 53 SubListType.tp_base = &PyList_Type; 54 if (PyType_Ready(&SubListType) < 0) 55 return NULL; 56 57 m = PyModule_Create(&sublistmodule); 58 if (m == NULL) 59 return NULL; 60 61 Py_INCREF(&SubListType); 62 if (PyModule_AddObject(m, "SubList", (PyObject *) &SubListType) < 0) { 63 Py_DECREF(&SubListType); 64 Py_DECREF(m); 65 return NULL; 66 } 67 68 return m; 69} 70