目标C:关于分配，保留和释放的新手问题 [英] Objective C: Newbie question about allocation, retain and release

问题描述

对于OC来说是新手，多年使用C，C ++，C#，现在头脑有点呆滞.

New to OC, many years of C, C++, C#, mind is kind of boggled now.

给出:

// AnInterface.h
@interface AnInterface : NSObject  
{  
}  

@property (retain) SomeObject* m_Object;  

// AnInterface.m
#import "AnInterface.h"  

@synthesize m_Object;  

-init
{  
  self= [super init];  
  if(!self)  
    return (nil);  

  SomeObject* pObject= [[SomeObject alloc] init];  
  self.m_Object= pObject;  
  [pObject release];
}  

我很确定上面的说法是正确的.然而， 为什么不这样做:

I am pretty sure the above is correct. However, why not just do:

self.m_Object= [[SomeObject alloc] init];  

这还行吗?是否违反某些内存管理原则?似乎应该起作用，一行而不是三行，但是我敢肯定我一定会遗漏一些东西....

Does that work as well? Is it in violation of some memory management tenet? It seems like it should work, one line rather than three, but I am certain I must be missing something....

任何见识都会受到赞赏.

Any insight would be appreciated.

推荐答案

原因是因为您将属性m_Object定义为保留，所以它会导致内存泄漏，因为alloc/init调用会导致保留+1，然后保留属性会保留至少给+2的保留数.如果您愿意，请随意使用自动发布池.

The reason is because you defined the property m_Object to retain so it would result in a memory leak because alloc/init call results in a retain of +1 then property will retain giving it at least a retain count of +2. If you would like to make it one line feel free to abuse the auto release pool.

self.m_Object= [[[SomeObject alloc] init] autorelease]; 

这篇关于目标C:关于分配，保留和释放的新手问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！