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annotate Include/setobject.h @ 74135:9c19df6c8ea0 3.2

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News entry for Issue12798
author Senthil Kumaran <senthil@uthcode.com>
date Fri, 23 Dec 2011 11:11:21 +0800
parents 62b61abd02b8
children 57f0af61da53
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1 /* Set object interface */
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2
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3 #ifndef Py_SETOBJECT_H
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4 #define Py_SETOBJECT_H
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5 #ifdef __cplusplus
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6 extern "C" {
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7 #endif
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9
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10 /*
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11 There are three kinds of slots in the table:
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12
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13 1. Unused: key == NULL
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14 2. Active: key != NULL and key != dummy
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15 3. Dummy: key == dummy
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16
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17 Note: .pop() abuses the hash field of an Unused or Dummy slot to
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18 hold a search finger. The hash field of Unused or Dummy slots has
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19 no meaning otherwise.
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20 */
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21 #ifndef Py_LIMITED_API
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22 #define PySet_MINSIZE 8
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23
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24 typedef struct {
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25 /* Cached hash code of the key. */
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26 Py_hash_t hash;
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27 PyObject *key;
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28 } setentry;
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31 /*
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32 This data structure is shared by set and frozenset objects.
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33 */
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34
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35 typedef struct _setobject PySetObject;
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36 struct _setobject {
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37 PyObject_HEAD
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38
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39 Py_ssize_t fill; /* # Active + # Dummy */
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40 Py_ssize_t used; /* # Active */
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41
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42 /* The table contains mask + 1 slots, and that's a power of 2.
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43 * We store the mask instead of the size because the mask is more
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44 * frequently needed.
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45 */
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46 Py_ssize_t mask;
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47
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48 /* table points to smalltable for small tables, else to
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49 * additional malloc'ed memory. table is never NULL! This rule
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50 * saves repeated runtime null-tests.
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51 */
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52 setentry *table;
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53 setentry *(*lookup)(PySetObject *so, PyObject *key, Py_hash_t hash);
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54 setentry smalltable[PySet_MINSIZE];
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56 Py_hash_t hash; /* only used by frozenset objects */
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57 PyObject *weakreflist; /* List of weak references */
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58 };
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59 #endif /* Py_LIMITED_API */
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60
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61 PyAPI_DATA(PyTypeObject) PySet_Type;
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62 PyAPI_DATA(PyTypeObject) PyFrozenSet_Type;
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63 PyAPI_DATA(PyTypeObject) PySetIter_Type;
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64
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65 /* Invariants for frozensets:
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66 * data is immutable.
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67 * hash is the hash of the frozenset or -1 if not computed yet.
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68 * Invariants for sets:
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69 * hash is -1
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70 */
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71
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72 #define PyFrozenSet_CheckExact(ob) (Py_TYPE(ob) == &PyFrozenSet_Type)
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73 #define PyAnySet_CheckExact(ob) \
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74 (Py_TYPE(ob) == &PySet_Type || Py_TYPE(ob) == &PyFrozenSet_Type)
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75 #define PyAnySet_Check(ob) \
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76 (Py_TYPE(ob) == &PySet_Type || Py_TYPE(ob) == &PyFrozenSet_Type || \
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77 PyType_IsSubtype(Py_TYPE(ob), &PySet_Type) || \
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78 PyType_IsSubtype(Py_TYPE(ob), &PyFrozenSet_Type))
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79 #define PySet_Check(ob) \
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80 (Py_TYPE(ob) == &PySet_Type || \
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81 PyType_IsSubtype(Py_TYPE(ob), &PySet_Type))
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82 #define PyFrozenSet_Check(ob) \
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83 (Py_TYPE(ob) == &PyFrozenSet_Type || \
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84 PyType_IsSubtype(Py_TYPE(ob), &PyFrozenSet_Type))
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85
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86 PyAPI_FUNC(PyObject *) PySet_New(PyObject *);
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87 PyAPI_FUNC(PyObject *) PyFrozenSet_New(PyObject *);
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88 PyAPI_FUNC(Py_ssize_t) PySet_Size(PyObject *anyset);
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89 #ifndef Py_LIMITED_API
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90 #define PySet_GET_SIZE(so) (((PySetObject *)(so))->used)
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91 #endif
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92 PyAPI_FUNC(int) PySet_Clear(PyObject *set);
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93 PyAPI_FUNC(int) PySet_Contains(PyObject *anyset, PyObject *key);
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94 PyAPI_FUNC(int) PySet_Discard(PyObject *set, PyObject *key);
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95 PyAPI_FUNC(int) PySet_Add(PyObject *set, PyObject *key);
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96 #ifndef Py_LIMITED_API
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97 PyAPI_FUNC(int) _PySet_NextEntry(PyObject *set, Py_ssize_t *pos, PyObject **key, Py_hash_t *hash);
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98 #endif
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99 PyAPI_FUNC(PyObject *) PySet_Pop(PyObject *set);
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100 #ifndef Py_LIMITED_API
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101 PyAPI_FUNC(int) _PySet_Update(PyObject *set, PyObject *iterable);
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102 #endif
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103
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104 #ifdef __cplusplus
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105 }
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106 #endif
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107 #endif /* !Py_SETOBJECT_H */