为什么要使用指针参数? [英] Why have pointer parameters?

问题描述

可能的重复项:
为什么使用指针?
将可修改的参数传递给c ++函数

Possible Duplicates:
Why use pointers?
Passing a modifiable parameter to c++ function

我为什么要有指针参数?我看到的唯一原因是小型函数试图减少混乱并减小内存占用.

Why would I want to have pointer parameters? The only reason I can see is for small functions to attempt to reduce confusion and a smaller memory footprint.

推荐答案

在

In Passing a modifiable parameter to c++ function I answered when to use a reference instead of a pointer.

相反，当满足以下任一条件时，建议使用指向引用的指针:

Conversely, prefer a pointer to a reference when any of the following are true:

• 可以为空
• 可以更改(指向其他内容)
• 必须删除

当所指向的对象应该发生突变时，有些人也喜欢使用指针，这表示const引用和非const引用之间的区别对读者来说并不明显.

Some people also prefer a pointer when the thing that's being pointed at should be mutated, saying that the difference between a const reference and a non-const reference isn't obvious enough to the reader.

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