Memory management analysis for multiple objects

//

Main.m

03-Memory management analysis for multiple objects

//

Created by Apple on 14-3-17.

//

//

#import <Foundation/Foundation.h>

People have a car

#import "Person.h"

1. Wild pointer problem

2. Memory leak issues

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

{

@autoreleasepool {

1

person * p = [[Person alloc] init];

1

Car * car = [[Car alloc] init];

2

[P Setcar:car];

[P Drive];

1

[Car release];

To ensure that the object P exists, any method that invokes the object p does not go wrong

[P Drive];

0

[P release];

}

return 0;

}

//

Person.m

01-Manual memory management Basic concepts

//

Created by Apple on 14-3-17.

//

//

#import "Person.h"

@implementation person

-(void) Setcar: (Car *) car

{

//2, able to make Retaincount + 1 and return to self

_car = [car retain];

}

-(CAR *) car

{

return _car;

}

-(void) drive

{

[_car Run];

}

-(void) dealloc

{

The goal is to ensure that when the P object exists, the car object must exist

When the object P is destroyed,

[_car release];

[Super Dealloc];

NSLog (@ "person has been destroyed");

}

@end

Memory management analysis for multiple objects