/* Set object interface */ #ifndef Py_SETOBJECT_H#define Py_SETOBJECT_H#ifdef __cplusplusextern "C" {#endif  /*There are three kinds of slots in the table: 1. Unused:  key == NULL2. Active:  key != NULL and key != dummy3. Dummy:   key == dummy Note: .pop() abuses the hash field of an Unused or Dummy slot tohold a search finger.  The hash field of Unused or Dummy slots hasno meaning otherwise.*/ #define PySet_MINSIZE 8 typedef struct {	long hash;      /* cached hash code for the entry key */	PyObject *key;} setentry;  /*This data structure is shared by set and frozenset objects.*/ typedef struct _setobject PySetObject;struct _setobject {	PyObject_HEAD 	Py_ssize_t fill;  /* # Active + # Dummy */	Py_ssize_t used;  /* # Active */ 	/* The table contains mask + 1 slots, and that's a power of 2.	 * We store the mask instead of the size because the mask is more	 * frequently needed.	 */	Py_ssize_t mask; 	/* table points to smalltable for small tables, else to	 * additional malloc'ed memory.  table is never NULL!  This rule	 * saves repeated runtime null-tests.	 */	setentry *table;	setentry *(*lookup)(PySetObject *so, PyObject *key, long hash);	setentry smalltable[PySet_MINSIZE]; 	long hash;		/* only used by frozenset objects */	PyObject *weakreflist;	/* List of weak references */}; PyAPI_DATA(PyTypeObject) PySet_Type;PyAPI_DATA(PyTypeObject) PyFrozenSet_Type; /* Invariants for frozensets: *     data is immutable. *     hash is the hash of the frozenset or -1 if not computed yet. * Invariants for sets: *     hash is -1 */ #define PyFrozenSet_CheckExact(ob) ((ob)->ob_type == &PyFrozenSet_Type)#define PyAnySet_CheckExact(ob) \	((ob)->ob_type == &PySet_Type || (ob)->ob_type == &PyFrozenSet_Type)#define PyAnySet_Check(ob) \	((ob)->ob_type == &PySet_Type || (ob)->ob_type == &PyFrozenSet_Type || \	  PyType_IsSubtype((ob)->ob_type, &PySet_Type) || \	  PyType_IsSubtype((ob)->ob_type, &PyFrozenSet_Type)) PyAPI_FUNC(PyObject *) PySet_New(PyObject *);PyAPI_FUNC(PyObject *) PyFrozenSet_New(PyObject *);PyAPI_FUNC(Py_ssize_t) PySet_Size(PyObject *anyset);#define PySet_GET_SIZE(so) (((PySetObject *)(so))->used)PyAPI_FUNC(int) PySet_Clear(PyObject *set);PyAPI_FUNC(int) PySet_Contains(PyObject *anyset, PyObject *key);PyAPI_FUNC(int) PySet_Discard(PyObject *set, PyObject *key);PyAPI_FUNC(int) PySet_Add(PyObject *set, PyObject *key);PyAPI_FUNC(int) _PySet_Next(PyObject *set, Py_ssize_t *pos, PyObject **key);PyAPI_FUNC(int) _PySet_NextEntry(PyObject *set, Py_ssize_t *pos, PyObject **key, long *hash);PyAPI_FUNC(PyObject *) PySet_Pop(PyObject *set);PyAPI_FUNC(int) _PySet_Update(PyObject *set, PyObject *iterable); #ifdef __cplusplus}#endif#endif /* !Py_SETOBJECT_H */