python: Make all CppOwnedPyObjects and similar support garbage collection.

If you want to subclass apt_pkg.Cache() and create an apt_pkg.DepCache()
object in it (e.g. as self.depcache) this is needed because otherwise,
Python would not know about the cyclic dependency and refuse to free any
of them.

This also changes apt_pkg.Cache to the standard deallocation schema,
because the underlying CacheFile deletes its pointers automatically on
deletion. Thus a second call is not needed.

1 files changed, 3 insertions, 3 deletions

diff --git a/python/indexfile.cc b/python/indexfile.cc
index ba709872..ef88c2f0 100644
--- a/python/indexfile.cc
+++ b/python/indexfile.cc
@@ -114,10 +114,10 @@ PyTypeObject PackageIndexFileType =
    0,                                   // tp_getattro
    0,                                   // tp_setattro
    0,                                   // tp_as_buffer
-   Py_TPFLAGS_DEFAULT,                  // tp_flags
+   Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, // tp_flags
    "pkgIndexFile Object",               // tp_doc
-   0,                                   // tp_traverse
-   0,                                   // tp_clear
+   CppOwnedTraverse<pkgIndexFile*>,     // tp_traverse
+   CppOwnedClear<pkgIndexFile*>,        // tp_clear
    0,                                   // tp_richcompare
    0,                                   // tp_weaklistoffset
    0,                                   // tp_iter