iPhone/Mac Objective-C内存管理教程和原理剖析(三)@property (retain)和@synthesize的默认实现

@interface ClassA : NSObject
{
         ClassB *objB;
}
 
-(ClassB *) getObjB;
-(void) setObjB:(ClassB *) value;
@end
 
@implementation ClassA
-(ClassB*) getObjB
{
         return objB;
}
 
-(void) setObjB:(ClassB*) value
{
         if (objB != value)
         {
                   [objB release];
                   objB = [value retain];
         }
}

-(void) dealloc
{
         [objB release];
         [super dealloc];
}