什么是＆QUOT;静态＆QUOT;功能？ [英] What is a "static" function?

问题描述

问题是关于纯Ç功能，不 C ++ 静态方法，如澄清意见。

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

好吧，我明白了一个静态变量是什么，但什么是静态功能？

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

和为什么它，如果我宣布一个函数，假设无效print_matrix ，在假设 AC （ WITHOUT 啊），并包括AC - 我得到print_matrix @@ ... ）在A.OBJ已经定义了，但如果我把它声明为静态无效print_matrix 然后再编译？

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?

更新只是为了澄清一些事情 - 我知道，包括 .C 是坏，正如你们许多人指出的那样，我只是做了在的main.cpp 暂时清除空间，直到我有一个更好的想法如何把所有这些功能集成到正确的 .HPP 和 .C 。只是一个暂时的，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.cpp until I have a better idea of how to group all those functions into proper .hpp and .c. Just a temporary, quick solution.

推荐答案

静态函数是只对在同一个文件等功能可见的功能（更多precisely的同样翻译单元 的）。

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

修改：对于那些谁想到，那的问题，笔者意味着一个类方法：由于这个问题被标记 C 他意味着一个普通的老C函数。对于（C ++ / Java的/ ...）类的方法，静态表示，这种方法可以在类本身被调用，没有必要的类的实例。

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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