C ++：const char * const的含义* [英] C++ : Meaning of const char*const*

问题描述

在其中一个C ++程序中，我看到了一个函数原型： int Classifier :: command（int argc，const char * const * argv）

In one of the C++ programs, I saw a function prototype : int Classifier::command(int argc, const char*const* argv)

const char * const * argv 是什么意思？是否与 const char * argv [] 相同？
const char ** argv 也意味着相同？

What does const char*const* argv mean? Is it the same as const char* argv[]? Does const char** argv also mean the same?

推荐答案

不，它不同于 const char * argv [] 。 const 禁止在特定的取消引用级别修改取消引用的值：

No, it's not the same as const char *argv[]. The const prohibits modifications of the dereferenced value at the particular level of dereferencing:

**argv = x; // not allowed because of the first const
*argv = y; // not allowed because of the second const
argv = z; // allowed because no const appears right next to the argv identifier

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