#include <iostream>
class cMySingleton{
private:
    static bool bInstantiated;
    int mInt;
    cMySingleton(){
        mInt=0;
    }
public:
    cMySingleton(int c){
        if (bInstantiated){
            std::cout << "you can only instantiated once";
        }
        else {
            cMySingleton();
            mInt=c;
        }
    }
};
bool cMySingleton::bInstantiated = 3;
int main () {

    cMySingleton s(5);
    cMySingleton t(6);
}