/prog/ - Number of args in ``int fun();''

Name: Anonymous 2012-12-02 18:13

Hey /prog/, did you know that you can do this in C:

int fun(); /* Whoops, we forgot ``void'' */



int main(int arg, char **argv)

{

  fun(fun, fun, "the Sussman", fun, fun, fun, (int)fun + (int)fun);

  return fun(3, 3, 3);

}



int fun()

{

  return 3;

}

It's been 6 years since I started writing C and I only now found out. From a fucking C++ book.

Name: Anonymous 2012-12-02 18:21

If you want backward compatibility with K&R, your compiler has to support doing this (though any modern one will print a warning when it does). It will probably be deprecated eventually.

Name: Anonymous 2012-12-02 18:21

Yes, we know.

Name: Anonymous 2012-12-02 18:37

You weren't writing C if you didn't know this.

Name: Anonymous 2012-12-02 18:56

>>4
C's varargs are for fart commanders

Name: Anonymous 2012-12-02 22:50

Some people, when confronted with a problem, think ``I know, I'll use C.'' Now they have two problems.

Name: Anonymous 2012-12-02 23:22

>>6

Some people, when confronted with a post, think ``I know, I'll recite that JWZ quote!'' Now we have two shitposts.

Name: Anonymous 2012-12-03 5:14

Why can this be useful?..

Name: Anonymous 2012-12-03 5:17

>>8
think printf family of functions

Name: Anonymous 2012-12-03 5:28

>>9
Only va, nothing else?
By the way, how does printf work in C++ then?

Name: Anonymous 2012-12-03 5:56

>>10
dunno, external symbol as function wrapper maybe

it might have its uses like impersonating polimorphism with types like

struct{

    char type_name[32];

    void * vtable;

    ... state

}

Name: Anonymous 2012-12-03 6:29

>>8
A function pointer with that type is compatible with a lot of clearly defined functions.

Name: Anonymous 2012-12-03 7:08

>>12
Care to elaborate?

Name: Anonymous 2012-12-03 7:23

>>11
char type_name[32];

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Name: Anonymous 2012-12-03 8:19

>>9
The code in >>1 has nothing to do with varargs.

Name: Anonymous 2012-12-03 11:48

>>15
It could have va_start et cetera

Name: Anonymous 2012-12-03 12:47

>>13
typedef int (*int_fn)();

Now variables of type int_fn can hold a pointer to any function that returns an int.

Name: Anonymous 2012-12-03 13:21

JWZ
Shalom!

Name: Anonymous 2012-12-03 13:34

C is deprecated

Name: Anonymous 2012-12-03 13:54

>>19
That was ENTERPRISE QUALITY Genuine Advantage Certified!

Name: Anonymous 2012-12-03 15:17

>>16
Different mechanism, not compatible, etc.

Name: Anonymous 2012-12-04 4:34

>>17
My anus constricted.

Number of args in ``int fun();''

1 Name: Anonymous 2012-12-02 18:13

2 Name: Anonymous 2012-12-02 18:21

3 Name: Anonymous 2012-12-02 18:21

4 Name: Anonymous 2012-12-02 18:37

5 Name: Anonymous 2012-12-02 18:56

6 Name: Anonymous 2012-12-02 22:50

7 Name: Anonymous 2012-12-02 23:22

8 Name: Anonymous 2012-12-03 5:14

9 Name: Anonymous 2012-12-03 5:17

10 Name: Anonymous 2012-12-03 5:28

11 Name: Anonymous 2012-12-03 5:56

12 Name: Anonymous 2012-12-03 6:29

13 Name: Anonymous 2012-12-03 7:08

14 Name: Anonymous 2012-12-03 7:23

15 Name: Anonymous 2012-12-03 8:19

16 Name: Anonymous 2012-12-03 11:48

17 Name: Anonymous 2012-12-03 12:47

18 Name: Anonymous 2012-12-03 13:21

19 Name: Anonymous 2012-12-03 13:34

20 Name: Anonymous 2012-12-03 13:54

21 Name: Anonymous 2012-12-03 15:17

22 Name: Anonymous 2012-12-04 4:34

Name: Anonymous 2012-12-02 18:13

Name: Anonymous 2012-12-02 18:21

Name: Anonymous 2012-12-02 18:21

Name: Anonymous 2012-12-02 18:37

Name: Anonymous 2012-12-02 18:56

Name: Anonymous 2012-12-02 22:50

Name: Anonymous 2012-12-02 23:22

Name: Anonymous 2012-12-03 5:14

Name: Anonymous 2012-12-03 5:17

Name: Anonymous 2012-12-03 5:28

Name: Anonymous 2012-12-03 5:56

Name: Anonymous 2012-12-03 6:29

Name: Anonymous 2012-12-03 7:08

Name: Anonymous 2012-12-03 7:23

Name: Anonymous 2012-12-03 8:19

Name: Anonymous 2012-12-03 11:48

Name: Anonymous 2012-12-03 12:47

Name: Anonymous 2012-12-03 13:21

Name: Anonymous 2012-12-03 13:34

Name: Anonymous 2012-12-03 13:54

Name: Anonymous 2012-12-03 15:17

Name: Anonymous 2012-12-04 4:34