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| author | Georg Brandl <georg@python.org> | 2010-08-02 17:49:25 (GMT) |
|---|---|---|
| committer | Georg Brandl <georg@python.org> | 2010-08-02 17:49:25 (GMT) |
| commit | 502c3eb52f35a969eca350dc90412bb409495f1e (patch) | |
| tree | fccdc6f25bf5ae79bb73c9982075a0a48d609b78 /Doc/c-api/weakref.rst | |
| parent | 2d3c4e79a19d8052d756575775a643a7107dced7 (diff) | |
| download | cpython-502c3eb52f35a969eca350dc90412bb409495f1e.zip cpython-502c3eb52f35a969eca350dc90412bb409495f1e.tar.gz cpython-502c3eb52f35a969eca350dc90412bb409495f1e.tar.bz2 | |
#8578: mention danger of not incref'ing weak referenced object.
Diffstat (limited to 'Doc/c-api/weakref.rst')
| -rw-r--r-- | Doc/c-api/weakref.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Doc/c-api/weakref.rst b/Doc/c-api/weakref.rst index 081419d..8a36110 100644 --- a/Doc/c-api/weakref.rst +++ b/Doc/c-api/weakref.rst @@ -53,7 +53,14 @@ as much as it can. .. cfunction:: PyObject* PyWeakref_GetObject(PyObject *ref) Return the referenced object from a weak reference, *ref*. If the referent is - no longer live, returns ``None``. + no longer live, returns :const:`Py_None`. + + .. warning:: + + This function returns a **borrowed reference** to the referenced object. + This means that you should always call :cfunc:`Py_INCREF` on the object + except if you know that it cannot be destroyed while you are still + using it. .. cfunction:: PyObject* PyWeakref_GET_OBJECT(PyObject *ref) |