Cast pointer address to int

Question

Beginner question: How can I take the adress of a pointer and save it as an int? Example:

int *ptr = xyz;
int i = static_cast<int>(ptr);

So if ptr points to the memory adress 123, i should be 123. My compiler says it's an error: invalid static_cast from type 'int*' to type 'int'.

Guess I am missing something but I don't know what.

Answer 1

You can use reinterpret_cast. An int is not guaranteed to be able to losslessly store a pointer though, so you should use the std::intptr_t type instead.