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

    cur_a = (unsigned char *)*a + i; // here
                             ^^^ that is dereferencing a void*

    cur_b = (unsigned char *)*b + i; // here
                             ^^^ that is dereferencing a void* also.

In the lines:

    *a = cur_b;
    *b = cur_a;

you are dereferencing void* too.

Here's my suggestion to fix the function:

void ft_swap(void *a, void *b, size_t nbytes)
{
   unsigned char* cpa;
   unsigned char* cpb;
   size_t          i;
   unsigned char c;

   cpa = (unsigned char *)a;
   cpb = (unsigned char *)b;

   for ( i = 0; i < nbytes; ++i )
   {
      c = cpa[i];
      cpa[i] = cpb[i];
      cpb[i] = c;
   }
}