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Use a type flag to determine the applicability of the tp_weaklistoffset 

field.  This should avoid binary incompatibility problems with older modules
that have not been recompiled.
This commit is contained in:
Fred Drake 2001-02-02 18:17:30 +00:00
parent 26d1f14433
commit 033f31270c
2 changed files with 10 additions and 1 deletions
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7
Include/object.h
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@ -344,11 +344,18 @@ given type object has a specified feature.
#define Py_TPFLAGS_HAVE_RICHCOMPARE (1L<<5)
/* Objects which are weakly referencable if their tp_weaklistoffset is >0 */
/* XXX Should this have the same value as Py_TPFLAGS_HAVE_RICHCOMPARE?
* These both indicate a feature that appeared in the same alpha release.
*/
#define Py_TPFLAGS_HAVE_WEAKREFS (1L<<6)
#define Py_TPFLAGS_DEFAULT ( \
Py_TPFLAGS_HAVE_GETCHARBUFFER | \
Py_TPFLAGS_HAVE_SEQUENCE_IN | \
Py_TPFLAGS_HAVE_INPLACEOPS | \
Py_TPFLAGS_HAVE_RICHCOMPARE | \
Py_TPFLAGS_HAVE_WEAKREFS | \
0)
#define PyType_HasFeature(t,f) (((t)->tp_flags & (f)) != 0)

4
Include/objimpl.h
View File

@ -271,7 +271,9 @@ extern DL_IMPORT(void) _PyGC_Dump(PyGC_Head *);
#endif /* WITH_CYCLE_GC */
/* Test if a type supports weak references */
#define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0)
#define PyType_SUPPORTS_WEAKREFS(t) \
(PyType_HasFeature((t), Py_TPFLAGS_HAVE_WEAKREFS) \
&& ((t)->tp_weaklistoffset > 0))
#define PyObject_GET_WEAKREFS_LISTPTR(o) \
((PyObject **) (((char *) (o)) + (o)->ob_type->tp_weaklistoffset))