function pointer error

Question

Can anybody help me with this simple code??

#include <iostream>
using namespace std;

void testFunction(){
    cout<<"This is the test function 0"<<endl;
}

void testFunction1(){
    cout<<"This is the test function 1"<<endl;
}

void testFunction2(){
    cout<<"This is the test function 2"<<endl;
}

void (*fp[])()={testFunction,testFunction1,testFunction2};

int main(){

    //fp=testFunction;
    (*fp[testFunction1])();
    //cout<<"Addrees of the function pointer is:"<<*fp;
}

I am getting the following error:

error: invalid types `void (*[3])()[void ()()]' for array subscript|

That is really evil stuff, by the way.

Andreas Bonini
– Andreas Bonini

2010-03-31 08:46:36 +00:00
Commented Mar 31, 2010 at 8:46 — Andreas Bonini
– Andreas Bonini, Commented Mar 31, 2010 at 8:46

unwind · Accepted Answer · 2010-03-31 08:45:48Z

7

You're trying to use a function pointer as an array index. That won't fly, array indices must be integer.

To call through a function pointer, just call:

(*fp[1])();

or the (even shorter!)

fp[1]();

will work.

answered Mar 31, 2010 at 8:45

unwind

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1 Comment

Jony Over a year ago

Thanks ...i don't know how i missed that.

Kim Gräsman · Accepted Answer · 2010-03-31 08:45:45Z

2

I think you meant to write:

(*fp[1])();

That is, you index the array with an int rather than the function itself.

answered Mar 31, 2010 at 8:45

Kim Gräsman

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Comments

Andreas Brinck · Accepted Answer · 2010-03-31 08:46:30Z

2

Your indexing the array fp of functions with a function pointer, try something like:

(*fp[some_index])();

instead

answered Mar 31, 2010 at 8:46

Andreas Brinck

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