Array of function pointers

[Yasir_Malik]

I'm having trouble creating an array of function pointers. Here's what I have:

int first_fit(int, int);
int best_fit(int, int);
int worst_fit(int, int);
int (*part_algo_array)[3](int, int);
part_algo_array[0] = first_fit;
part_algo_array[1] = best_fit;
part_algo_array[2] = worst_fit;

I get these compiler errors:
main.c:17: ANSI C++ forbids declaration `part_algo_array' with no type
main.c:17: invalid initializer
main.c:18: ANSI C++ forbids declaration `part_algo_array' with no type
main.c:18: conflicting types for `int part_algo_array[1]'
main.c:17: previous declaration as `int part_algo_array[0]'
main.c:18: invalid initializer
main.c:19: ANSI C++ forbids declaration `part_algo_array' with no type
main.c:19: conflicting types for `int part_algo_array[2]'
main.c:18: previous declaration as `int part_algo_array[1]'
main.c:19: invalid initializer
main.c: In function `int main(int, char **)':
main.c:115: `part_algo_array[part_algo]' cannot be used as a function

I the same error when I place '&' before the function names (part_algo_array[0] = &first_fit; )

Can anyone help me out. Thanks.

[Dave_Sinkula]

int (*part_algo_array[3])(int, int);

[Salem]

So why are you using a C++ compiler (check your error messages) if you're posting on the C board.

#include <stdio.h>
int first_fit(int a, int b){return a+b;}
int best_fit(int a, int b){return a+b;}
int worst_fit(int a, int b){return a+b;}
typedef int (*fnptr)(int,int);
int main( int argc, char *argv[] ) {
    int (*part_algo_array[3])(int, int);
    fnptr array2[3];
    part_algo_array[0] = first_fit;
    part_algo_array[1] = best_fit;
    part_algo_array[2] = worst_fit;
    array2[0] = first_fit;
    array2[1] = best_fit;
    array2[2] = worst_fit;
    return 0;
}

When it comes to function pointers, you can make life a lot easier with a suitable typedef.

[Yasir_Malik]

Thank you for replying.
Although I am writing my code in C++, those three functions are just C functions, so I decided to post here. I'm sorry if I was disruptive.
And, yes, Salem, your solution works. The weird thing is that when I put the code you had in main before the call to main, main.cc did not compile. Is there a reason for this?

[Hammer]

>>Is there a reason for this?
Yes. The best place to start looking is the compiler output. If you don't understand what it's saying, post the code and the errors here.

However, based on what you said, have you put code outside a function? Code cannot live in global space, only inside a function.

[quzah]

Originally posted by Salem
When it comes to function pointers, you can make life a lot easier with a suitable typedef.

Probably the only reason I can ever see myself using typedef. I think it was created for this one purpose alone.

Quzah.