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/* Set object interface */
#ifndef Py_SETOBJECT_H
#define Py_SETOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif
/*
There are three kinds of slots in the table:
1. Unused: key == NULL
2. Active: key != NULL and key != dummy
3. Dummy: key == dummy
Note: .pop() abuses the hash field of an Unused or Dummy slot to
hold a search finger. The hash field of Unused or Dummy slots has
no 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
int fill; /* # Active + # Dummy */
int 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.
*/
int 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 only:
* data is immutable.
* hash is the hash of the frozenset or -1 if not computed yet.
*/
#define PyFrozenSet_CheckExact(ob) ((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))
#ifdef __cplusplus
}
#endif
#endif /* !Py_SETOBJECT_H */
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