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Direct Function Calling

Posted on 1997-02-22
1
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Last Modified: 2010-04-10
I need to be able to call a function given only it's address.  I want to be able to pass that address into one function and then call the function that address coresponds to.

void foo(int i){
  //Some Code Here
}
void foo2(int i){
  //Some Code Here
}

void caller(void *tmp){
  void *ptr = tmp; //Make ptr = address of foo
  ptr(1);
  }

void main(void){
  caller(foo);
  caller(foo2);
}

I realize this does not work but I want to do something similar to this.  Is there an easy way to do it or do I need to use assembly?
I known I could use classes and virtual functions but would like to do it this way.

Thanx
lordx@wam.umd.edu
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Question by:lordx
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1 Comment
 
LVL 3

Accepted Solution

by:
os012897 earned 70 total points
ID: 1162110
As far as I can remember it should work like that:

.....
...
.

void caller (void *tmp)

{    (*tmp) (1);   //dereference function + call it with argument
}

void main (void)

{    caller (&foo);  //get address of foo
     caller (&foo2); //get address of foo2
}


Regards,

       os

0

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