Use offsetof() rather than icky homemade equivalent

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/Modules/python.cxx b/Source/Modules/python.cxx
index 7ee4ae225..233f79bd6 100644
--- a/Source/Modules/python.cxx
+++ b/Source/Modules/python.cxx
@@ -3401,7 +3401,7 @@ public:
     printSlot(f, getSlot(n, "feature:python:tp_dict"), "tp_dict");
     printSlot(f, getSlot(n, "feature:python:tp_descr_get"), "tp_descr_get", "descrgetfunc");
     printSlot(f, getSlot(n, "feature:python:tp_descr_set"), "tp_descr_set", "descrsetfunc");
-    Printf(f, "    (size_t)(((char*)&((SwigPyObject *) 64L)->dict) - (char*) 64L), /* tp_dictoffset */\n");
+    Printf(f, "    offsetof(SwigPyObject, dict), /* tp_dictoffset */\n");
     printSlot(f, tp_init, "tp_init", "initproc");
     printSlot(f, getSlot(n, "feature:python:tp_alloc"), "tp_alloc", "allocfunc");
     printSlot(f, "0", "tp_new", "newfunc");