/******************************************************************************************
* Shape.h
* Created on: 5-Jan-2018 17:25:28
* Original author: linx
* Computer Science & Technology, Linx
* Copyright (c) 2018-2023. All rights reserved.
******************************************************************************************/
#include <iostream>
class Base {
protected:
int i;
public:
explicit Base(int a) { i = a; }
virtual void display()
{ std::cout << "I am Base class object, i = " << i << std::endl; }
};
class Derived : public Base {
int j;
public:
explicit Derived(int a, int b) : Base(a) { j = b; }
void display() {
std::cout << "I am Derived class object, i = "
<< i << ", j = " << j << std::endl;
}
};
// Global method, Base class object is passed by value
void somefunc(Base obj) {
obj.display();
}
// Global method, Base class object is passed by pointer
void somefuncpointer(Base *obj) {
obj->display();
}
int main() {
Base b(33);
Derived d(45, 56);
somefunc(b);
somefunc(d); // Object Slicing, the member j of d is sliced off
Base *p = new Derived(78, 89);
somefuncpointer(p);
delete p;
return 0;
}
output:
I am Base class object, i = 33
I am Base class object, i = 45
I am Derived class object, i = 78, j = 89
