diff options
Diffstat (limited to 'Objects')
| -rw-r--r-- | Objects/setobject.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Objects/setobject.c b/Objects/setobject.c index e922b6e..a279ec2 100644 --- a/Objects/setobject.c +++ b/Objects/setobject.c @@ -793,6 +793,19 @@ set_len(PyObject *so) return ((PySetObject *)so)->used; } +/* set_swap_bodies() switches the contents of any two sets by moving their + internal data pointers and, if needed, copying the internal smalltables. + Semantically equivalent to: + + t=set(a); a.clear(); a.update(b); b.clear(); b.update(t); del t + + The function always succeeds and it leaves both objects in a stable state. + Useful for creating temporary frozensets from sets for membership testing + in __contains__(), discard(), and remove(). Also useful for operations + that update in-place (by allowing an intermediate result to be swapped + into one of original the inputs). +*/ + static void set_swap_bodies(PySetObject *a, PySetObject *b) { |