OC ARC之循环引用问题（代码分析）

//
//  main.m
//  03-arc-循环引用
//
//  Created by apple on 13-8-11.
//  Copyright (c) 2013年 itcast. All rights reserved.
//

#import <Foundation/Foundation.h>

@class Dog;

@interface Person : NSObject

@property (nonatomic, strong) Dog *dog;

@end

#import "Person.h"

@implementation Person

- (void)dealloc
{
    NSLog(@"Person--dealloc");
}

@end


#import <Foundation/Foundation.h>

@class Person;

@interface Dog : NSObject

@property (nonatomic, weak) Person *person;

@end

#import "Dog.h"

@implementation Dog
- (void)dealloc
{
    NSLog(@"Dog--dealloc");
}
@end



#import <Foundation/Foundation.h>
#import "Person.h"
#import "Dog.h"

/*
 当两端循环引用的时候，解决方案：
 1> ARC
 1端用strong，另1端用weak
 
 2> 非ARC
 1端用retain，另1端用assign
 */

int main()
{
    Person *p = [[Person alloc] init];
    
    
    Dog *d = [[Dog alloc] init];
    p.dog = d;
    d.person = p;

    return 0;
}