C99 static inline function with static local variable

Question

If I write something like this in a C99 header:

static inline void f()
{
    static int x = 0;
    // Do something with x
}

Is it guaranteed that each module including this header gets a separate instantiation of f() and its own instantiation of x?

Paul J. Lucas · Accepted Answer · 2016-11-24 18:47:24Z

2

Yes, by definition, that's what static means. The fact that it's in a header is irrelevant. Conceptually, the C preprocessor creates one file to compile per .c file as if you had just (re)typed all the text in the header into the .c yourself.

answered Nov 24, 2016 at 18:47

Paul J. Lucas

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