//

//  Person.h

#import <Foundation/Foundation.h>

#import "Room.h"

#import "Car.h"

#import "Dog.h"

@interface Person : NSObject

{

    Room *_room;

    Car *_car;

    Dog *_dog;

}

/*

- (void)setRoom:(Room *)room;

- (void)setCar:(Car *)car;

- (void)setDog:(Dog *)dog;

- (Room *)room;

- (Car *)car;

- (Dog *)dog;

 */

@property(nonatomic, retain) Room *room;//标准写法都是(nonatomic, retain)

/*

 写了retain就可以生成：

 - (void)setRoom:(Room *)room

 {

     // 1.判断传入的对象和当前对象是否一样

     if (_room != room) {

         // 2.release以前的对象

         [_room release];

         // 3.retain传入的对象

         _room = [room retain];

     }

 }

 */

/*

 readonly: 只会生成getter方法

 readwrite: 既会生成getter也会生成setter, 默认什么都不写就是readwrite

 getter: 可以给生成的getter方法起一个名称

 setter: 可以给生成的setter方法起一个名称

 retain: 就会自动帮我们生成getter/setter方法内存管理的代码，上次44，45的内容

 assign: 不会帮我们生成set方法内存管理的代码, 仅仅只会生成普通的getter/setter方法, 默认什么都不写就是assign。

 多线程

 atomic ：性能低（默认）

 nonatomic ：性能高

 在iOS开发中99.99%都是写nonatomic，因为手机性能低。 atomic用于pc开发中。

*/

@end

//

//  Person.m

#import "Person.h"

@implementation Person

/*

- (void)setRoom:(Room *)room

{

    // 1.判断传入的对象和当前对象是否一样

    if (_room != room) {

        // 2.release以前的对象

        [_room release];

        // 3.retain传入的对象

        _room = [room retain];

    }

}

- (void)setCar:(Car *)car

{

    if (_car != car) {

        [_car release];

        _car = [car retain];

    }

}

- (void)setDog:(Dog *)dog

{

    if (_dog != dog) {

        [_dog release];

        _dog = [dog retain];

    }

}

- (Room *)room

{

    return _room;

}

- (Car *)car

{

    return _car;

}

- (Dog *)dog

{

    return _dog;

}

 */

- (void)dealloc

{

    [_room release];

    [_car release];

    [_dog release];

    NSLog(@"%s", __func__);

    [super dealloc];

}

@end

//

//  main.m

//  property修饰符

#import <Foundation/Foundation.h>

#import "Person.h"

int main(int argc, const char * argv[]) {

    Person *p = [Person new];

    Room *r = [Room new];

    /*

//    Car *c =[Car new];

//    Dog *d = [Dog new];

//    p.room = r;

//    p.car = c;

//    p.dog = d;

//    [d release];

//    [c release];

//    [r release];

//    [p release];

     */

    p.room = r;

    [r release];

    // 换房了, 如果set方法中没有release旧值, 就会内存泄露

    Room *r2 = [Room new];

    p.room = r2;

    [r2 release];

    // 重复赋值

    p.room = r;

    [p release];

    return ;

}