test-class-access.cpp

#include <iostream>

using namespace std;

class A {
    // no constructors or assignment operators are defined, so using compiler generated ones
  public: 
    void setA(int value) { a = value; }
    int getA() { return a; }
    void setF(float value) { f = value; }
    float getF() { return f; }
  private:
    int a = -1;
    float f = -1.0f;
};

int main()
{
    A a;  // compiler generated default constructor
    std::cout << "values from compiler generated default constructor" << std::endl;
    std::cout << "a.a = " << a.getA() << std::endl;
    std::cout << "a.f = " << a.getF() << std::endl;
    std::cout << std::endl;
    
    a.setA(2);
    a.setF(2.0f);
    
    A b(a);  // compiler generated copy constructor
    std::cout << "values from compiler generated copy constructor" << std::endl;
    std::cout << "b.a = " << b.getA() << std::endl;
    std::cout << "b.f = " << b.getF() << std::endl;
    std::cout << std::endl;
    
    a.setA(3);
    a.setF(3.0f);
    
    A c;
    c = a;  // compiler generated assignment operator
    std::cout << "values from compiler generated assignment operator" << std::endl;
    std::cout << "c.a = " << c.getA() << std::endl;
    std::cout << "c.f = " << c.getF() << std::endl;

    return 0;
}