Is it safe to cast an int to void pointer and back to int again?

Question

In C and/or C++: is it safe to cast an int to void pointer and back to int again?

Based on the question \"C++: Is it safe to cast pointer to int and later back to po

Answer 1

If the range of your integers is fairly small, you could always do something like:

static const char dummy[MAXVAL];

and then use dummy+i as a way of encoding i as a pointer. This is 100% portable. If you only care that it's 99% portable, you could use (char *)0 + i.