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User's Guide to the GNU Objective-C Class Library

12.2 Basic Enumerating

The most basic enumerator is

Method: Collection @keyword{-withObjectsCall:} (void(*)(id))func

@deftypemethodx Collection {} @keyword{-safeWithObjectsCall:} (void(*)(id))func @deftypemethodx Collection {} @keyword{-withElementsCall:} (void(*)(elt))func @deftypemethodx Collection {} @keyword{-safeWithElementsCall:} (void(*)(elt))func Calls the function func with each the members of the collection. Returns self.

Method: Collection (void*) -newEnumState

Method: Collection -freeEnumState: (void**)enumStatePtr

Method: Collection (BOOL) -getNextObject: (id *)anObjectPtr @keyword{withEnumState:} (void**)enumState

@deftypemethodx {Collection} {(BOOL)} -getNextElement: (elt *)anElementPtr @keyword{withEnumState:} (void**)enumState

void print_first_difference (id coll1, id coll2) { void *enumState1, *enumState2; id object1, object2; enumState1 = [coll1 newEnumState]; enumState2 = [coll2 newEnumState]; while ([coll1 getNextObject:&object1 withEnumState:&enumState1] && [coll2 getNextObject:&object2 withEnumState:&enumState2]) { if ([object1 compare:object2]) { [object1 printForDebugger]; [object2 printForDebugger]; } } [coll1 freeEnumState:&enumState1]; [coll2 freeEnumState:&enumState2]; }

Method: Collection -withElementsCall: (void(*)(elt))aFunc @keyword{whileTrue:} (BOOL*)flag

@deftypemethodx {Collection} {} -safeWithElementsCall: (void(*)(elt))aFunc @keyword{whileTrue:} (BOOL*)flag