Friend Function Access

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

class Register8 {
private:
    uint8_t value;
public:
    void setValue(uint8_t v) { 
        value = v; 
    }

    friend void printRegister(const Register8& r) {
        cout << "Register value = " << +r.value;
    }

};

int main() {
    Register8 r;
    r.setValue(170);
    printRegister(r);
    return 0;
}