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#include <iostream>
#include <utility>

class Singleton {
public:
    static Singleton* getInstance() {
        static Singleton instance;
        return &instance;
    }
    
    Singleton(const Singleton&) = delete;
    Singleton& operator=(const Singleton&) = delete;
    Singleton(Singleton&&) = delete;
    Singleton& operator=(Singleton&&) = delete;
private:
    Singleton() {
        std::cout << "Singleton instance created." << std::endl;
    }
    ~Singleton() {
        std::cout << "Singleton instance destroyed." << std::endl;
    }
};

int main() {
    Singleton* singleton1 = Singleton::getInstance();
    Singleton* singleton2 = Singleton::getInstance();

    // Singleton sa = *singleton1;
    // Singleton sb(*singleton1);
    // Singleton sc = std::move(*singleton1);
    // Singleton sd(std::move(*singleton1));
    if (singleton1 == singleton2) {
        std::cout << "Both instances are the same." << std::endl;
    } else {
        std::cout << "Instances are different." << std::endl;
    }

    return 0;
}