Useless HOM sample

ADVSafeProxy.h

//
//  Copyright © 2012 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface ADVSafeProxy : NSProxy

- (id) initWithObject:(id)object;

@end

ADVSafeProxy.m

//
//  Copyright © 2012 Yuri Kotov
//

#import "ADVSafeProxy.h"

@implementation ADVSafeProxy
{
    id _object;
}

- (id) initWithObject:(id)object
{
    _object = object;
    return self;
}

- (id) forwardingTargetForSelector:(SEL)selector
{
    return [_object respondsToSelector:selector] ? _object : nil;
}

- (NSMethodSignature *) methodSignatureForSelector:(SEL)aSelector
{
    return [NSMethodSignature signatureWithObjCTypes:"v@:"];
}

- (void) forwardInvocation:(NSInvocation *)invocation
{
    // Do nothing
}

@end

NSObject+ADVMessaging.h

//
//  Copyright © 2012 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface NSObject (ADVMessaging)

- (id) ifResponds;

@end

NSObject+ADVMessaging.m

//
//  Copyright © 2012 Yuri Kotov
//

#import "NSObject+ADVMessaging.h"
#import "ADVSafeProxy.h"

@implementation NSObject (ADVMessaging)

- (id) ifResponds
{
    return [[ADVSafeProxy alloc] initWithObject:self];
}

@end