#include <iostream>
#include <memory>
using namespace std;

class Counter {
private:
    static unique_ptr<Counter> instance; // Singleton instance
    int count;                           // Simple counter

    // Private constructor
    Counter() : count(0) {
        cout << "Counter instance created!" << endl;
    }

public:
    // Delete copy constructor and assignment operator
    Counter(const Counter&) = delete;
    Counter& operator=(const Counter&) = delete;

    // Static method to get the single instance
    static Counter* getInstance() {
        if (!instance) {
            instance.reset(new Counter());
        }
        return instance.get();
    }

    // Increment and display count
    void increment() {
        count++;
        cout << "Count: " << count << endl;
    }
};

// Initialize the static unique_ptr
unique_ptr<Counter> Counter::instance = nullptr;

int main() {
    Counter* counter1 = Counter::getInstance();
    counter1->increment(); // Count: 1

    Counter* counter2 = Counter::getInstance();
    counter2->increment(); // Count: 2

    // Check if both instances are the same
    cout << (counter1 == counter2 ? "Singleton works!" : "Singleton failed!") << endl;

    return 0;
}