数组语法与在C函数的参数指针语法 [英] Array syntax vs. pointer syntax in C function parameters

问题描述

据我了解阵列如何衰减到指针。我明白，编译器，这样的：

I understand how arrays decay to pointers. I understand that, for the compiler, this:

void foo(int *arg1);

相当于100％这样的：

is 100% equivalent to this:

void foo(int arg1[]);

如果一个样式preferred比其他？我想是一致的，但我有一个很难证明或者决定。

Should one style be preferred over the other? I want to be consistent, but I'm having a hard time justifying either decision.

虽然 INT主（INT ARGC，CHAR *的argv []）和 INT主（INT ARGC，字符** argv的）都是一样的，前者似乎更为常见（纠正我，如果我错了）。

Although int main(int argc, char *argv[]) and int main(int argc, char **argv) are the same, the former seems to be much more common (correct me if I'm wrong).

推荐答案

我会推荐的针对使用函数的参数 [] 语法。

I would recommend against using the [] syntax for function parameters.

赞成使用的一个参数 [] 的是，它意味着，在自记录方式，即指针有望指向一个以上的事情。例如：

The one argument in favour of using [] is that it implies, in a self-documenting way, that the pointer is expected to point to more than one thing. For example:

void swap(int *x, int *y)
double average(int vals[], int n)

不过，为什么是的char * 总是用于字符串，而不是的char [] ？我宁愿是一致的，而应使用 * 。

But then why is char * always used for strings rather than char []? I'd rather be consistent and always use *.

有些人喜欢，他们可能可以常量的一切，包括通过噪声值参数。

Some people like to const everything they possibly can, including pass-by-value parameters. The syntax for that when using [] (available only in C99) is less intuitive and probably less well-known:

为const char * const的* const的话与为const char * const的字[常量]

虽然我认为这最后常量是矫枉过正，在任何情况下。

Although I do consider that final const to be overkill, in any case.

此外，该阵列的的方式衰减的不完全直观。特别是，它是的不可以应用递归（字符字[] [] 不工作）。尤其是当你开始在更多的间接投掷，在 [] 语法只是造成混乱。 IMO最好是始终使用指针语法，而不是一个数组作为参数传递pretending。

Furthermore, the way that arrays decay is not completely intuitive. In particular, it is not applied recursively (char words[][] doesn't work). Especially when you start throwing in more indirection, the [] syntax just causes confusion. IMO it is better to always use pointer syntax rather than pretending that an array is passed as an argument.

更多信息：的http：// C- faq.com/~scs/cgi-bin/faqcat.cgi?sec=aryptr#aryptrparam 。

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