这是什么意思“ - >”？

问题描述

Ive几乎只在objective-c中编程，几个月前我在box2d编程了一个，并说这个 - >。这是什么意思？它的目标必须是c ++，因为box2d是c ++，我有一次看到有人在objective-c代码中使用它，我似乎不能理解它做了什么。 Google不支持非文字字符，所以它不可能为我google，因为我不知道是什么。

解决方案

$

  type * a; 
  

（* a）.b 到 a-> b

此处有更多信息，

Ive almost only programmed in objective-c, for a couple of months ago I programmed a little in box2d and say this "->". Now what does that mean? its cant be objective-c it must be from c++ because box2d is c++, I one time saw someone using it in objective-c code and I just couldn't seem to understand what it did. Google doesn't support non-text characters so its impossible for me to google it since I don't know what it is.

解决方案

The -> operator is shorthand for deferencing and then accessing a member.

Given

type *a;

(*a).b is equivalent to a->b

More information here, en.wikipedia.org/wiki

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