Test

@protocol Delegate
@required
- (void) onCall;
@end

@interface CallCore : NSObject{
    id delegate;
}

+ (id)initWithDelegate:(id)obj;

- (void) callOnCall;


@property id delegate;

@end

@interface Call : NSObject<Delegate>{
    CallCore *caller;
}


@property CallCore *caller;
@end



@implementation CallCore

@synthesize delegate = _delegate;

+ (id)initWithDelegate:(id)obj
{
    CallCore *retn = [[CallCore alloc] init];
    [retn setDelegate:obj];

    return retn;
}

- (void) callOnCall
{
    if([[self delegate] conformsToProtocol:@protocol(Delegate)])
        [[self delegate] onCall];
}

@end


@implementation Call
@synthesize caller = _caller;

- (id) init{
    caller = [CallCore initWithDelegate:self];
    [caller callOnCall];
    return self;
}

- (void) onCall{
    printf("Call::onCall");
}

@end