std :: string vs. char * [英] std::string vs. char*

问题描述

std :: string在堆栈或堆上存储的数据与char *不同吗?还是只是从char *派生到一个类中?

does std::string store data differently than a char* on either stack or heap or is it just derived from char* into a class?

推荐答案

char *

• 是您的CPU体系结构的一个指针的大小.
• 可能是从 malloc 或 calloc 或 new 或 new [] 返回的值.
  • 如果是这样，完成后必须传递给 free 或 delete 或 delete [] .
  • 如果是这样，字符将存储在堆中.

  char*

  • Is the size of one pointer for your CPU architecture.
  • May be a value returned from malloc or calloc or new or new[].
    • If so, must be passed to free or delete or delete[] when you're done.
    • If so, the characters are stored on the heap.
    • 通常，无法判断 char * 参数是否指向堆栈，堆或全局空间.
    • Generically, no way to tell if a char* argument points to stack, heap, or global space.
    • 是几个指针的大小，通常是三个.
    • 在创建时自行构造:不需要 new 或 delete .
      • 拥有字符串的副本(如果字符串可能会更改).
      • 可以从 char * 复制此字符串.
      • 默认情况下，内部使用 new [] 的方式与获取 char * 的方式相同.
      • Is the size of several pointers, often three.
      • Constructs itself when created: no need for new or delete.
        • Owns a copy of the string, if the string may be altered.
        • Can copy this string from a char*.
        • By default, internally uses new[] much as you would to obtain a char*.
        • 定义 c_str()，该代码将返回 char * 以供临时使用.
        • Defines c_str() which returns a char* for temporary use.
        • string :: iterator 是灵活的:一种实现可能使它成为范围检查的超级安全调试助手，或者只是使之成为超高效的 char * 一个开关.
        • string::iterator is flexible: an implementation may make it a range-checked super-safe debugging helper or simply a super-efficient char* at the flip of a switch.

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