Make reversed() transparent with respect to length.
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5cab2e3a88
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@ -145,6 +145,10 @@ class TestReversed(unittest.TestCase):
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s = 'hello'
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self.assertEqual(list(reversed(reversed(s))), list(s))
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def test_len(self):
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s = 'hello'
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self.assertEqual(len(reversed(s)), len(s))
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def test_main(verbose=None):
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testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig,
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TestReversed)
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@ -230,6 +230,12 @@ reversed_next(reversedobject *ro)
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return item;
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}
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static int
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reversed_len(reversedobject *ro)
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{
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return PyObject_Size(ro->seq);
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}
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static PyObject *
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reversed_reverse(reversedobject *ro, PyObject *unused)
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{
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@ -244,6 +250,12 @@ PyDoc_STRVAR(reversed_doc,
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static PyMethodDef reversed_methods[] = {
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{"__reversed__", (PyCFunction)reversed_reverse,
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METH_NOARGS, reversed_doc},
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{NULL, NULL} /* sentinel */
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};
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static PySequenceMethods reversed_as_sequence = {
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(inquiry)reversed_len, /* sq_length */
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0, /* sq_concat */
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};
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PyTypeObject PyReversed_Type = {
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@ -260,7 +272,7 @@ PyTypeObject PyReversed_Type = {
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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&reversed_as_sequence, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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