箭VS点语法？ [英] Arrow vs dot syntax?

问题描述

有一个朋友走的是数据结构课程，我试图解释一个链表的背景的差异。我真的应该知道这一点，但已经专注于高层次的框架，我有点生疏了。我知道，箭与指针使用，但仅此而已。

A friend is taking a data structures course and I'm trying to explain the difference in the context of a linked list. I really should know this, but having focused on high level frameworks, I'm a little rusty. I know that "arrows are used with pointers", but that's it.

从本质上讲，在C，什么是点与和访问某些变量的属性时，箭头之间的区别？另外，因为我在一个特别愚蠢的心情来的，这是在C ++中一样，还是改变它？

Essentially, in C, what's the difference between a dot and and an arrow when accessing a property of some variable? Also, because I'm in a particularly stupid mood, is this the same in C++, or did it change?

推荐答案

通常情况下，。当你有一个结构的直接访问，而<$ C $使用C> - 方式＆gt; 当你有一个指向一个结构，需要取消引用它来访问结构

Normally the . is used when you have a structure to access directly, and the -> when you have a pointer to a structure and need to dereference it to access the structure.

A-＆GT; b 是语法糖（*一）.B 。它在C和C ++一样的。

a->b is syntactic sugar for (*a).b. It's the same in both C and C++.

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