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save(): Fix for SF bug #494904: Cannot pickle a class with a

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metaclass, reported by Dan Parisien.

Objects that are instances of custom metaclasses, i.e. whose ob_type
is a subclass of PyType_Type, should be pickled the same as new-style
classes (objects whose ob_type is PyType_Type).  This can't be done
through the existing dispatch switches, and the __reduce__ trick
doesn't work for these, since it finds the unbound __reduce__ for
instances of the class (inherited from PyBaseObject_Type).  So check
explicitly using PyType_IsSubtype().
This commit is contained in:
Guido van Rossum 2001-12-19 16:56:54 +00:00
parent f048a8f6d7
commit 950dce6f01
1 changed files with 5 additions and 0 deletions
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5
Modules/cPickle.c
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@ -1990,6 +1990,11 @@ save(Picklerobject *self, PyObject *args, int pers_save) {
} }
} }
if (PyType_IsSubtype(type, &PyType_Type)) {
res = save_global(self, args, NULL);
goto finally;
}
if (!pers_save && self->inst_pers_func) { if (!pers_save && self->inst_pers_func) {
if ((tmp = save_pers(self, args, self->inst_pers_func)) != 0) { if ((tmp = save_pers(self, args, self->inst_pers_func)) != 0) {
res = tmp; res = tmp;