// sizeofvirtual.cpp - shows size effect of virtual class
// cmc, 11/21/2011

#include <iostream>
using namespace std;

class NoVirt {
public:
    int x;
    int getX() const {return x;}
    NoVirt(int x=0) : x(x) { }
};

class NoVirtSquared : public NoVirt {
public:
    int getX() const {return x*x;}
    NoVirtSquared(int x=0) : NoVirt(x) { }
};

class Virt {
public:
    int x;
    virtual int getX() const {return x;}
    Virt(int x=0) : x(x) { }
};

class VirtSquared : public Virt {
public:
    virtual int getX() const {return x*x;}
    VirtSquared(int x=0) : Virt(x) { }
};

void pr(const char *s, NoVirt &o) {
    cout << "size of " << s << ": " << sizeof o << ";";
    cout << "    value: " << o.getX() << endl; // T must have getX()
}

void pr(const char *s, Virt &o) {
    cout << "size of " << s << ": " << sizeof o << ";";
    cout << "    value: " << o.getX() << endl; // T must have getX()
}

int main(){
    NoVirt nv(5);
    NoVirtSquared nvs(5);
    Virt v(6);
    VirtSquared vs(6);
    pr("nv",nv);
    pr("nvs",nvs);
    pr("v",v);
    pr("vs",vs);
}