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Make reversed() transparent with respect to length.

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This commit is contained in:
Raymond Hettinger 2004-02-10 09:33:39 +00:00
parent 5cab2e3a88
commit 029dba5a40
2 changed files with 17 additions and 1 deletions
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14
Objects/enumobject.c
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@ -230,6 +230,12 @@ reversed_next(reversedobject *ro)
return item;
}
static int
reversed_len(reversedobject *ro)
{
return PyObject_Size(ro->seq);
}
static PyObject *
reversed_reverse(reversedobject *ro, PyObject *unused)
{
@ -244,6 +250,12 @@ PyDoc_STRVAR(reversed_doc,
static PyMethodDef reversed_methods[] = {
{"__reversed__", (PyCFunction)reversed_reverse,
METH_NOARGS, reversed_doc},
{NULL, NULL} /* sentinel */
};
static PySequenceMethods reversed_as_sequence = {
(inquiry)reversed_len, /* sq_length */
0, /* sq_concat */
};
PyTypeObject PyReversed_Type = {
@ -260,7 +272,7 @@ PyTypeObject PyReversed_Type = {
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
&reversed_as_sequence, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */