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Patch #552433: Special-case tuples. Avoid sub-type checking for lists.

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Avoid checks for negative indices and duplicate checks for support of
the sequence protocol.
This commit is contained in:
Martin v. Löwis 2002-05-08 08:44:21 +00:00
parent 000e37c3c4
commit 01f94bda38
4 changed files with 35 additions and 2 deletions
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20
Objects/iterobject.c
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@ -12,6 +12,11 @@ PyObject *
PySeqIter_New(PyObject *seq)
{
seqiterobject *it;
if (!PySequence_Check(seq)) {
PyErr_BadInternalCall();
return NULL;
}
it = PyObject_GC_New(seqiterobject, &PySeqIter_Type);
if (it == NULL)
return NULL;
@ -63,7 +68,7 @@ iter_iternext(PyObject *iterator)
it = (seqiterobject *)iterator;
seq = it->it_seq;
if (PyList_Check(seq)) {
if (PyList_CheckExact(seq)) {
PyObject *item;
if (it->it_index >= PyList_GET_SIZE(seq)) {
return NULL;
@ -73,8 +78,19 @@ iter_iternext(PyObject *iterator)
Py_INCREF(item);
return item;
}
if (PyTuple_CheckExact(seq)) {
PyObject *item;
if (it->it_index >= PyTuple_GET_SIZE(seq)) {
return NULL;
}
item = PyTuple_GET_ITEM(seq, it->it_index);
it->it_index++;
Py_INCREF(item);
return item;
}
else {
PyObject *result = PySequence_GetItem(seq, it->it_index++);
PyObject *result = PySequence_ITEM(seq, it->it_index);
it->it_index++;
if (result != NULL) {
return result;
}