#include <iostream>
 
enum statetype {firststate, secondstate, stopstate};
 
void dofirststate() {
    //does stuff
    std::cout << "HI! ";
    throw secondstate;
}
 
void dosecondstate() {
    //does stuff
    std::cout << "BYE!";
    throw stopstate;
}
 
int main() {
   statetype curstate = firststate;
   while (curstate!= stopstate) { 
       try {
           switch (curstate) {
           case firststate: dofirststate();
           case secondstate: dosecondstate();
           }
       } catch(statetype& s) {
           curstate = s;
       }
    }
    return 0;
}
 

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