Untitled

#import <Foundation/Foundation.h>
#import <stdio.h>

@interface Hoge : NSObject
{
    id object;
}
- (id)init;
- (void)replaceSelf;

@property (readonly) id object;
@end

@implementation Hoge
@synthesize object;
- (id)init
{
    self = [super init];
    if (self)
    {
        object = [[NSObject alloc] init];
    }
    return self;
}
- (void)replaceSelf
{
    self = [self init]; // init以外のインスタンスメソッドでselfを上書きする
}
- (void)dealloc
{
    [object release];
    [super dealloc];
}
@end

int main()
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    Hoge *hoge = [[Hoge alloc] init];
    NSLog(@"%@ -- %@", hoge.description, hoge.object);

    [hoge replaceSelf];
    NSLog(@"%@ -- %@", hoge.description, hoge.object);

    [hoge release];
    [pool release];

    getchar();

    return 0;
}

// 実行すると↓みたいな感じになる．
// hoge.objectがメモリリークしそうな気がするけど…

// 2012-03-19 21:18:17.558 hoge[18860:707] <Hoge: 0x101314520> -- <NSObject: 0x101314590>
// 2012-03-19 21:18:17.563 hoge[18860:707] <Hoge: 0x101314520> -- <NSObject: 0x7ff20a500170>