什么是“静态"?C中的函数? [英] What is a "static" function in C?

问题描述

问题是关于简单的 c 函数，不是 c++ static 方法，如注释中所述.

The question was about plain c functions, not c++ static methods, as clarified in comments.

我了解 static 变量是什么，但什么是 static 函数?

I understand what a static variable is, but what is a static function?

为什么如果我声明一个函数，比方说void print_matrix，比方说ac(没有ah)并包括"ac" - 我得到 "print_matrix@@....) 已经在 a.obj" 中定义，但是如果我将它声明为 static void print_matrix 然后编译?

And why is it that if I declare a function, let's say void print_matrix, in let's say a.c (WITHOUT a.h) and include "a.c" - I get "print_matrix@@....) already defined in a.obj", BUT if I declare it as static void print_matrix then it compiles?

UPDATE 只是为了澄清问题 - 正如你们许多人指出的那样，我知道包含 .c 是不好的.我只是为了暂时清除 main.c 中的空间，直到我更好地了解如何将所有这些函数分组到正确的 .h 和 .c 文件.只是一个临时的、快速的解决方案.

UPDATE Just to clear things up - I know that including .c is bad, as many of you pointed out. I just do it to temporarily clear space in main.c until I have a better idea of how to group all those functions into proper .h and .c files. Just a temporary, quick solution.

推荐答案

static 函数是仅对同一文件中的其他函数可见的函数(更准确地说，相同的翻译单位).

static functions are functions that are only visible to other functions in the same file (more precisely the same translation unit).

编辑:对于那些认为问题的作者意味着类方法"的人:由于问题被标记为 C，他的意思是一个普通的旧 C 函数.对于 (C++/Java/...) 类方法，static 意味着可以在类本身上调用此方法，不需要该类的实例.

EDIT: For those who thought, that the author of the questions meant a 'class method': As the question is tagged C he means a plain old C function. For (C++/Java/...) class methods, static means that this method can be called on the class itself, no instance of that class necessary.

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