added class version checks

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

diff --git a/sope-ical/NGiCal/iCalEvent.m b/sope-ical/NGiCal/iCalEvent.m
index 94c4aebd3004bcacc638affe026c629b792a982f..a6945a4fd4174fad8bdfef5f752131705fa63fc1 100644 (file)
--- a/sope-ical/NGiCal/iCalEvent.m
+++ b/sope-ical/NGiCal/iCalEvent.m
@@ -33,6 +33,15 @@
 
 @implementation iCalEvent
 
++ (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->endDate      release];
   [self->duration     release];