gistfile1.c

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;