Mercurial > cpython-lru_cache-weakref
diff Objects/setobject.c @ 35336:503c3697578f 2.4
Teach set modules to correctly compute s-=s and s^=s as the empty set.
| author | Raymond Hettinger <python@rcn.com> |
|---|---|
| date | Sat, 13 Aug 2005 02:28:54 +0000 |
| parents | dc8ae499efcf |
| children | 97c97194e64b |
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--- a/Objects/setobject.c Fri Aug 12 23:47:50 2005 +0000 +++ b/Objects/setobject.c Sat Aug 13 02:28:54 2005 +0000 @@ -193,6 +193,16 @@ PyDoc_STRVAR(copy_doc, "Return a shallow copy of a set."); static PyObject * +set_clear(PySetObject *so) +{ + PyDict_Clear(so->data); + so->hash = -1; + Py_RETURN_NONE; +} + +PyDoc_STRVAR(clear_doc, "Remove all elements from this set."); + +static PyObject * set_union(PySetObject *so, PyObject *other) { PySetObject *result; @@ -379,6 +389,9 @@ set_difference_update(PySetObject *so, PyObject *other) { PyObject *item, *tgtdata, *it; + + if ((PyObject *)so == other) + return set_clear(so); it = PyObject_GetIter(other); if (it == NULL) @@ -758,16 +771,6 @@ return 0; } -static PyObject * -set_clear(PySetObject *so) -{ - PyDict_Clear(so->data); - so->hash = -1; - Py_RETURN_NONE; -} - -PyDoc_STRVAR(clear_doc, "Remove all elements from this set."); - static int set_tp_clear(PySetObject *so) {