#include <iostream>
using namespace std;
 
enum class Enum { Q,W,E,R };
 
class EnumHolder {
  public:
   explicit EnumHolder(Enum e) : Value(e) {}
   EnumHolder() = delete;
   operator bool() const {
   	 return (Value == Enum::Q || Value == Enum::W);
   }
  private:
   Enum Value;
};
 
int main() {
  EnumHolder E(Enum::E);
  if (E) {
  	std::cout << "Enum Q or W" << std::endl;
  } else {
  	std::cout << "Enum E or R" << std::endl;
  }
  return 0;
}

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