char * const 和 const char * 有什么区别? [英] What is the difference between char * const and const char *?

问题描述

有什么区别:

char * const 

和

const char *

推荐答案

区别在于 const char * 是一个指向 const char 的指针，而 char * const 是一个指向 char 的常量指针.

The difference is that const char * is a pointer to a const char, while char * const is a constant pointer to a char.

首先，被指向的值不能改变，但指针可以改变.第二种，被指向的值可以改变，但指针不能(类似于引用).

The first, the value being pointed to can't be changed but the pointer can be. The second, the value being pointed at can change but the pointer can't (similar to a reference).

还有一个

const char * const

这是一个指向常量字符的常量指针(所以它的任何内容都不能改变).

which is a constant pointer to a constant char (so nothing about it can be changed).

注意:

以下两种形式是等价的:

The following two forms are equivalent:

const char *

和

char const *

C++ 标准中描述了这种情况的确切原因，但重要的是要注意并避免混淆.我知道几种更喜欢的编码标准:

The exact reason for this is described in the C++ standard, but it's important to note and avoid the confusion. I know several coding standards that prefer:

char const

结束

const char

(带或不带指针)以便 const 元素的位置与带有指针的 const 相同.

(with or without pointer) so that the placement of the const element is the same as with a pointer const.

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