oc51--循环retain

//  main.m
//  循环retain#import <Foundation/Foundation.h>
#import "Person.h"
#import "Dog.h"int main(int argc, const char * argv[]) {Person *p = [Person new];Dog *d = [Dog new];// 如果A对用要拥有B对象, 而B对应又要拥有A对象, 此时会形成循环retain// 如何解决这个问题: 不要让A retain B, B retain A// 让其中一方不要做retain操作即可p.dog = d; // retaind.owner = p; // retain  assign
    [p release];[d release];return 0;
}

//  Dog.h#import <Foundation/Foundation.h>
@class Person;@interface Dog : NSObject//@property(nonatomic, retain)Person *owner;
@property(nonatomic, assign)Person *owner;
@end

//  Dog.m#import "Dog.h"
#import "Person.h"@implementation Dog-(void)dealloc
{NSLog(@"%s", __func__);
//    [_owner release];
//    self.owner = nil;
    [super dealloc];
}
@end

//
//  Person.h#import <Foundation/Foundation.h>
@class Dog;@interface Person : NSObject@property(nonatomic, retain)Dog *dog;
@end

//  Person.m#import "Person.h"
#import "Dog.h"@implementation Person- (void)dealloc
{NSLog(@"%s", __func__);
//    [_dog release];self.dog = nil;[super dealloc];
}
@end