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Improve the reverse list iterator to free memory as soon as the iterator 

is exhausted.
This commit is contained in:
Raymond Hettinger 2003-11-08 11:58:44 +00:00
parent e21f606657
commit 001f228f36
1 changed files with 4 additions and 1 deletions
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5
Objects/listobject.c
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@ -2771,7 +2771,7 @@ PyTypeObject PyListIter_Type = {
typedef struct { typedef struct {
PyObject_HEAD PyObject_HEAD
long it_index; long it_index;
PyListObject *it_seq; PyListObject *it_seq; /* Set to NULL when iterator is exhausted */
} listreviterobject; } listreviterobject;
PyTypeObject PyListRevIter_Type; PyTypeObject PyListRevIter_Type;
@ -2819,6 +2819,9 @@ listreviter_next(listreviterobject *it)
item = PyList_GET_ITEM(it->it_seq, it->it_index); item = PyList_GET_ITEM(it->it_seq, it->it_index);
it->it_index--; it->it_index--;
Py_INCREF(item); Py_INCREF(item);
} else if (it->it_seq != NULL) {
Py_DECREF(it->it_seq);
it->it_seq = NULL;
} }
return item; return item;
} }