Where Function pointers are stored ?

This is a discussion on Where Function pointers are stored ? within the C Programming forums, part of the General Programming Boards category; Hi Where function are stored in memory? In the following example , where function pointer fp stored ? Code: #include ...

  1. #1
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    Where Function pointers are stored ?

    Hi

    Where function are stored in memory?


    In the following example , where function pointer fp stored ?
    Code:
    #include <math.h> #include <stdio.h> // Function taking a function pointer as an argument double compute_sum(double (*funcp)(double), double lo, double hi) {
    double sum = 0.0; // Add values returned by the pointed-to function '*funcp' for (int i = 0; i <= 100; i++)
    {
    double x, y; // Use the function pointer 'funcp' to invoke the function x = i/100.0 * (hi - lo) + lo; y = (*funcp)(x); sum += y;
    }
    return sum;
    } int main(void) {
    double (*fp)(double); // Function pointer double sum; // Use 'sin()' as the pointed-to function fp = &sin; sum = compute_sum(fp, 0.0, 1.0); printf("sum(sin): %f\n", sum); // Use 'cos()' as the pointed-to function sum = compute_sum(&cos, 0.0, 1.0); printf("sum(cos): %f\n", sum); return 0;
    }


  2. #2
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    It depends on where you declare it. In the code above, it is stored on the stack, just like sum or any other local variables, like if you had a char * or int * variable. You could dynamically allocate space for a function pointer, and have it be stored on the heap, or declare it as a global or static local, and have it be stored with the other global and static local variables, but that is less common.

    Remember, a function pointer is just a pointer, so all it contains is the address. It doesn't store the function itself (i.e. no code or variables).

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