Driver Resource Composition

#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 RegisterBlock {
private:
    int reg;

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

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

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

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

class Driver {
private:
    // Declare Buffer first
    Buffer buf;
    // Declare RegisterBlock second
    RegisterBlock reg;

public:
    // Constructor must store input values
    // Print "Driver initialized"
    Driver(int a,int b){
        buf.write(a);
        reg.write(b);
        printf("Driver initialized\n");
    }
    void print() const {
        // Print buffer value
        printf("Buffer value: %d\n",buf.read());
        // Print register value
        printf("Register value: %d\n",reg.read());
    }

    // Destructor must print "Driver destroyed"
    ~Driver(){
        printf("Driver destroyed\n");
    }
};

int main() {
    int a, b;
    cin >> a >> b;

    {
        Driver drv(a, b);
        drv.print();
    }

    return 0;
}