commit deletes

Task/Delegates/Objective-C/delegates.m

@@ -1,76 +0,0 @@
-#import <Foundation/Foundation.h>
-
-@interface Delegator : NSObject {
-
-    id delegate;
-}
-
-- (id)delegate;
-- (void)setDelegate:(id)obj;
-- (NSString *)operation;
-
-@end
-
-@implementation Delegator
-
-- (id)delegate {
-
-    return delegate;
-}
-
-- (void)setDelegate:(id)obj {
-
-    delegate = obj; // Weak reference
-}
-
-- (NSString *)operation {
-
-    if ([delegate respondsToSelector:@selector(thing)])
-        return [delegate thing];
-
-    return @"default implementation";
-}
-
-@end
-
-// Any object may implement these
-@interface NSObject (DelegatorDelegating)
-
-- (NSString *)thing;
-
-@end
-
-@interface Delegate : NSObject
-
-// Don't need to declare -thing because any NSObject has this method
-
-@end
-
-@implementation Delegate
-
-- (NSString *)thing {
-
-    return @"delegate implementation";
-}
-
-@end
-
-// Example usage
-// Memory management ignored for simplification
-int main() {
-
-    // Without a delegate:
-    Delegator *a = [[Delegator alloc] init];
-    NSLog(@"%d\n", [[a operation] isEqualToString:@"default implementation"]);
-
-    // With a delegate that does not implement thing:
-    [a setDelegate:@"A delegate may be any object"];
-    NSLog(@"%d\n", [[a operation] isEqualToString:@"delegate implementation"]);
-
-    // With a delegate that implements "thing":
-    Delegate *d = [[Delegate alloc] init];
-    [a setDelegate:d];
-    NSLog(@"%d\n", [[a operation] isEqualToString:@"delegate implementation"]);
-
-    return 0;
-}