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#include <iostream>

using namespace std;

class Singleton {

public:

static Singleton* Instance() {

if (!_instance) {

_instance = new Singleton();

}

return _instance;

}

private:

Singleton() { cout << "Singleton..." << endl; }

static Singleton* _instance;

};

Singleton* Singleton::_instance = nullptr;

int main() {

Singleton *singleton1 = Singleton::Instance();

cout << singleton1 << endl;

Singleton *singleton2 = Singleton::Instance();

cout << singleton2 << endl;

delete Singleton::Instance();

return 0;

}