C - Dereferencing void pointer

Question

I\'m trying to create my own swap function but I have troubles.
Why I\'m getting \" dereferencing void pointer \" ?

void    ft_swap(void *a, void *b, size         


        

Answer 1

It's not allowed to dereference void pointer. You need to cast it to another pointer type:

cur_a = (unsigned char *)a;

Similarly, you can't assign anything to *a. Right code is:

void ft_swap(void *a, void *b, size_t nbytes) {
    unsigned char  *cur_a = (unsigned char *) a;
    unsigned char  *cur_b = (unsigned char *) b;

    for (size_t i = 0; i < nbytes; ++i) {
        unsigned char tmp = cur_a[i];
        cur_a[i] = cur_b[i];
        cur_b[i] = tmp;
    }
}