objective-c中的箭头操作符 [英] arrow operator in objective-c

问题描述

我有一个问题，这是代码：

I have a question, here's the code:

@interface MyFoo : NSObject {
    NSString *nameStr;
}
@end
@implementation MyFoo
- (id)init {
    self = [super init];
    if (self) {
        self->nameStr = [@"some value of the string that is set right into the private ivar" copy];
    }
    return self;
}
@end

问题是：忽略所有C ++规则，忽略内存转储漏洞，为什么我不应该使用这样的箭头操作符语法？
在Apple文档中是否存在一个规则，说明它是不正确的，因为在将来的类中可能表示与运行时等结构的指针不同？

The question is: ignoring all the C++ rules, ignoring memory dump vulnerability, why exactly I shouldn't use such arrow operator syntax? Is there somewhere in Apple documentation a rule which says that it's incorrect because in future class may be represented differently than a pointer to a struct in runtime etc. ?

提前致谢！

推荐答案

使用 self-> someIvar 与 someIvar 相同。这没有错，但也不需要。

The use of self->someIvar is identical to someIvar. It's not wrong but it's not needed either.

我使用箭头符号的唯一一次是在 copyWithZone的实现中：所以我可以复制每个没有属性的ivars。

The only time I use the arrow notation is in an implementation of copyWithZone: so I can copy each of the ivars that don't have properties.

SomeClass *someCopy = ...
someCopy->ivar1 = ivar1; // = self->ivar1
someCopy->ivar2 = ivar2; // = self->ivar2

你在哪里看到任何说你不应该使用的东西箭头运算符语法？

Where are you seeing anything that says you shouldn't use such arrow operator syntax?

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