Driver Owns Buffer

#include <iostream>
using namespace std;

class Buffer {
private:
    int data;

public:
    Buffer() {
        cout << "Buffer created" << endl;
    }

    ~Buffer() {
        cout << "Buffer destroyed" << endl;
    }

    void write(int value) {
        data = value;
    }

    int read() const {
        return data;
    }
};

class Driver {
private:
    // Driver must own the buffer
    Buffer BUf;

public:
    // Constructor should accept input value and store it in buffer
    Driver(int value){
        BUf.write(value);
        cout<<"Driver initialized"<<endl;
    }

    void print() const {
        // Print stored value
        cout<<"Stored value: "<<BUf.read()<<endl;
    }

    // Add destructor to observe shutdown
    ~Driver(){cout<<"Driver destroyed"<<endl;}
};

int main() {
    int value;
    cin >> value;

    {
        Driver drv(/* pass value */value);
        drv.print();
    }

    return 0;
}

Solving Approach