added class version checks

[sope] / sope-ical / NGiCal / iCalEntityObject.m

diff --git a/sope-ical/NGiCal/iCalEntityObject.m b/sope-ical/NGiCal/iCalEntityObject.m
index f92ec0605034e12dc79550268327ab6c7edbed06..6f78e6c53e66b2c3de50b14b5834025fdf82f861 100644 (file)
--- a/sope-ical/NGiCal/iCalEntityObject.m
+++ b/sope-ical/NGiCal/iCalEntityObject.m
@@ -29,6 +29,15 @@
 
 @implementation iCalEntityObject
 
++ (int)version {
+  return [super version] + 0 /* v0 */;
+}
++ (void)initialize {
+  NSAssert2([super version] == 0,
+            @"invalid superclass (%@) version %i !",
+            NSStringFromClass([self superclass]), [super version]);
+}
+
 - (void)dealloc {
   [self->uid          release];
   [self->summary      release];