Re: Embedding Python - Deleting a class instance
On Tue, Jun 21, 2005 at 12:06:47PM +, Bue Krogh Vedel-Larsen wrote: How do I delete a class instance created using PyInstance_New? I've tried calling Py_CLEAR on the instance, but __del__ isn't called. I've also tried calling PyObject_Del, but this gives an access violation in _PyObject_DebugDumpAddress so I guess that ain't a good idea :) I've noticed that the PyObject returned by PyInstance_New has refcount = 2, does this have any significance? Well, the only way to do that is to call PyDECREF. And this is only legal when you really remove the reference, or else you get dangling pointers which will lead to a corrupted heap and/or segfault somewhere in the future of your program. Andreas -- http://mail.python.org/mailman/listinfo/python-list
Embedding Python - Deleting a class instance
How do I delete a class instance created using PyInstance_New? I've tried calling Py_CLEAR on the instance, but __del__ isn't called. I've also tried calling PyObject_Del, but this gives an access violation in _PyObject_DebugDumpAddress so I guess that ain't a good idea :) I've noticed that the PyObject returned by PyInstance_New has refcount = 2, does this have any significance? -- http://mail.python.org/mailman/listinfo/python-list
Re: Embedding Python - Deleting a class instance
On Tue, 21 Jun 2005 12:06:47 GMT Bue Krogh Vedel-Larsen [EMAIL PROTECTED] wrote: How do I delete a class instance created using PyInstance_New? I've tried calling Py_CLEAR on the instance, but __del__ isn't called. I've also tried calling PyObject_Del, but this gives an access violation in _PyObject_DebugDumpAddress so I guess that ain't a good idea :) It is deleted automatically when reference count become zero or when garbage collector runs if the object contains references to itself. Just call Py_DECREF on it if you are not going to use it anymore. I've noticed that the PyObject returned by PyInstance_New has refcount = 2, does this have any significance? The code below prints 1: PyObject *obj = PyInstance_New(PyExc_Exception, 0, 0); std::cerr obj-ob_refcnt \n; Does it create circular references in constructor? -- Denis S. Otkidach http://www.python.ru/ [ru] -- http://mail.python.org/mailman/listinfo/python-list
Re: Embedding Python - Deleting a class instance
Jeff Epler [EMAIL PROTECTED] wrote in news:[EMAIL PROTECTED]: Unless there's a cycle and GC gets involved, all there is to deleting *anything* in Python is correctly managing the refcount. On the other hand, you can never free an object while it is still reachable. Some local name x may never spontaneously lose the thing it refers to. Thanks for the replies. I've solved it, it was a kind of cycle: When creating the instance it registered itself with my code, and was supposed to unregister itself when deleted, but since I kept a copy of the object in the program it never got unregistered, and thus never deleted... -- http://mail.python.org/mailman/listinfo/python-list
