❔ Variable Access-Manipulation ?

Is there a way to have a variable constantly point to another variables value without being in a threaded/tasked environment?

int main_global_val = 32;

int local_main = ref main_global_val; ?
// have local_main always refer to main_global_val's value

int main_global_val = 32;

int local_main = ref main_global_val; ?
// have local_main always refer to main_global_val's value

how could i do something like this?