c++ - 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 pointer again?".

Answer 1

In most modern-day commonplace machines, probably.

However, I'd bet that there is some obscure compiler or configuration (say, a 16-bit addressed machine that uses 32-bit integer arithmetic) where that is not the case.

A uintptr_t is guaranteed to hold both, though, so use that type if you want to.