#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);
}
 

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