Question

我是来自C++世界的开端目标方案家。我认为,很难理解国家统计局目标提供的记忆管理:

我有以下几类:

@interface User : NSObject
{
  NSString* name;
}

@property (nonatomic,retain) NSString* name;

- (id)   initWithName: (NSString*) theName;
- (void) release;

@end

@implementation User

@synthesize name

- (id) initWithName: (NSString*) theName
{
    if ( self = [super init] )
    {
        [self setName:theName];
    }
    return self;
}

- (void) release
{
    [name release];
    [super release];
}

@end

在考虑以下法典时,我不能理解保留的结果:

NSString* name = [[NSString alloc] initWithCString:/*C string from sqlite3*/];
// (1) name retainCount = 1
User* user = [[User alloc] initWithName:name];
// (2) name retainCount = 2
[whateverMutableArray addObject:user];
// (3) name retainCount = 2
[user release];
// (4) name retainCount = 1
[name release];
// (5) name retainCount = 0

At (4), the retain count of name decreased from 2 to 1. But that s not correct, there is still the instance of user inside the array that points to name ! The retain count of a variable should only decrease when the retain count of a referring variable is 0, that is, when it is dealloced, not released.

Answer 1

页: 1 <代码>用户其<代码>dealloc将打电话至>。



如果您改名为release,优先于dealloc,则保留的款项将按您的期望计算。

Answer 2


http://www.ohchr.org。 因此:

- (void) release


应:

- (void) dealloc


您正在组合<代码> 姓名/代码>和<编码> 用户/代码> 记忆管理—每个物体都有自己的记忆。

页: 1 不适用<代码>NSObjects>release的方法,因此我假定不会按预期运作。更改<代码>release至>dealloc>。用户。

在定点之后,我们可以审视一下你的其他问题。

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