如何消除传递多维数组为const多维数组的警告？ [英] How to eliminate warning for passing multidimensional array as const multidimensional array?

问题描述

下面给出code：

/* signatures */
int getParams(char params[MAX_PARAM_LEN][MAX_LINE_LEN]);
int getVersion(const char params[MAX_PARAM_LEN][MAX_LINE_LEN],
               const char* tagName );
/* initializing */
char params[MAX_PARAM_LEN][MAX_LINE_LEN] = {};

/* getting parameters */
paramCount = getParams(params); /* OK, params match with getParams signature */

/* processing the params array */
i = getVersion(params, "version"); /* warning: passing arg 1 of `getVersion' from incompatible pointer type */

我看到常量性的问题，但我不知道为什么或如何避免它。我要的是它不能修改 PARAMS 了一个函数。任何意见是值得欢迎的（除了禁用此警告或处理功能删除常量）。

I see that the constness is the problem, but I don't know why or how to avoid it. What I want is a function which can't modify the params anymore. Any advice is welcome(besides disabling this warning or deleting const in the processing function).

感谢：
Visko

Thanks: Visko

推荐答案

您不能消除这些C警告，而不进行显式转换为正确的类型。如果没有一个typedef这会很难看，虽然

You can't eliminate these warnings in C without making an explicit cast to the proper type. Without a typedef this is going to look ugly though

i = getVersion((const char (*)[MAX_LINE_LEN]) params, "version")

这是特定于C语言很怪。在C ++中这个问题是固定的。

This is a strange quirk specific to C language. In C++ this issue was fixed.

顺便说一句，在 {} 初始化是你是如何获得在C非法的是的编译？

BTW, the {} initializer is illegal in C. How did you manage to get that to compile?

这篇关于如何消除传递多维数组为const多维数组的警告？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！