指针const char vs char数组vs std :: string

问题描述

这里我有两行代码

  const char * s1 =test 
 char s2 [] =test; 
  

两行代码都有相同的行为，所以我看不出任何区别， c $ c> s1 over s2 ，反之亦然。除了s1和s2之外，还有使用 std :: string 的方法。我认为使用std :: string的方式是最优雅的。看着其他代码，我经常看到人们使用const char * 或 char s [] 。因此，我的问题是，我应该什么时候使用 const char * s1 或 char s [] 或 std :: string ？

解决方案

  const char * s1 =test; 
 char s2 [] =test; 
  

这两个不相同。 s1 是不可变的：它指向常量内存。修改字符串文字是未定义的行为。

是的，在C ++中，应该优先使用 std :: string p>

Here I've two lines of code

const char * s1 = "test";
char s2 [] = "test";

Both lines of code have the same behavior, so I cannot see any difference whether I should prefer s1 over s2 or vice-versa. In addition to s1 and s2, there is also the way of using std::string. I think the way of using std::string is the most elegant. While looking at other code, I often see that people either use const char * or char s []. Thus, my question is now, when should I use const char * s1 or char s [] or std::string? What are the differences and in which situations should I use which approach?

解决方案

const char * s1 = "test";
char s2 [] = "test";

These two aren't identical. s1 is immutable: it points to constant memory. Modifying string literals is undefined behaviour.

And yes, in C++ you should prefer std::string.

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