mirror of https://github.com/python/cpython.git
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/* Set object interface */
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#ifndef Py_SETOBJECT_H
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#define Py_SETOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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There are three kinds of slots in the table:
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1. Unused: key == NULL
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2. Active: key != NULL and key != dummy
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3. Dummy: key == dummy
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Note: .pop() abuses the hash field of an Unused or Dummy slot to
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hold a search finger. The hash field of Unused or Dummy slots has
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no meaning otherwise.
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*/
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#define PySet_MINSIZE 8
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typedef struct {
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long hash; /* cached hash code for the entry key */
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PyObject *key;
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} setentry;
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/*
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This data structure is shared by set and frozenset objects.
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*/
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typedef struct _setobject PySetObject;
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struct _setobject {
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PyObject_HEAD
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int fill; /* # Active + # Dummy */
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int used; /* # Active */
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/* The table contains mask + 1 slots, and that's a power of 2.
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* We store the mask instead of the size because the mask is more
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* frequently needed.
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*/
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int mask;
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/* table points to smalltable for small tables, else to
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* additional malloc'ed memory. table is never NULL! This rule
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* saves repeated runtime null-tests.
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*/
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setentry *table;
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setentry *(*lookup)(PySetObject *so, PyObject *key, long hash);
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setentry smalltable[PySet_MINSIZE];
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long hash; /* only used by frozenset objects */
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PyObject *weakreflist; /* List of weak references */
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};
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PyAPI_DATA(PyTypeObject) PySet_Type;
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PyAPI_DATA(PyTypeObject) PyFrozenSet_Type;
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/* Invariants for frozensets:
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* data is immutable.
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* hash is the hash of the frozenset or -1 if not computed yet.
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* Invariants for sets:
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* hash is -1
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*/
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#define PyFrozenSet_CheckExact(ob) ((ob)->ob_type == &PyFrozenSet_Type)
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#define PyAnySet_CheckExact(ob) \
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((ob)->ob_type == &PySet_Type || (ob)->ob_type == &PyFrozenSet_Type)
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#define PyAnySet_Check(ob) \
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((ob)->ob_type == &PySet_Type || (ob)->ob_type == &PyFrozenSet_Type || \
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PyType_IsSubtype((ob)->ob_type, &PySet_Type) || \
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PyType_IsSubtype((ob)->ob_type, &PyFrozenSet_Type))
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_SETOBJECT_H */
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