#include using namespace std; class A { void display(){} }; class B : public A { }; class C { int x; }; class D { int* x; }; class E { virtual void display(){} }; class F { int x[10]; }; class G : public F { }; class H : public F { }; class I : public G, public H { }; class J : virtual public F { }; class K : virtual public F { }; class L : public J, public K { }; class M : public C { double d; }; int main() { // it has no data member...Functions doesnot count in object size..... so, size is 1 due to empty class size cout << "sizeof(A) : " << sizeof(A) << endl; // it has no data member..so, size is 1 due to empty class size...note that empty class size doesnot inherit and hence size is not two...it is still one cout << "sizeof(B) : " << sizeof(B) << endl; // it has one int...so, size is 4 or 8 based on 32 or 64 bit system cout << "sizeof(C) : " << sizeof(C) << endl; //it has one pointer member...hence size is 4 or 8 cout << "sizeof(D) : " << sizeof(D) << endl; //it has no data member...Functions doesnot count in object size, but it is virtual and hence size is 4 or 8 cout << "sizeof(E) : " << sizeof(E) << endl; //it has 10 int as own data... so, size is 10*4 or 10*8 cout << "sizeof(F) : " << sizeof(F) << endl; //it has no own data member , but inheritance gives 10 int as members. So size is 10*4 or 10*8 cout << "sizeof(G) : " << sizeof(G) << endl; //it has no own data member , but inheritance gives 10 int as members. So size is 10*4 or 10*8 cout << "sizeof(H) : " << sizeof(H) << endl; //it has no own data member , but this is diamond problem. it has both 10 int as members. So size is 20*4 or 20*8 cout << "sizeof(I) : " << sizeof(I) << endl; //it has no own data member , but inheritance gives 10 int as members. So size is 10*4 or 10*8 + vptr size due to virtual inheritance cout << "sizeof(J) : " << sizeof(J) << endl; //it has no own data member , but inheritance gives 10 int as members. So size is 10*4 or 10*8 + vptr size due to virtual inheritance cout << "sizeof(K) : " << sizeof(K) << endl; //it has no own data member , but this is not diamond problem. it has only 10 int as members. So size is 10*4 or 10*8 + two vptr of both inheritance cout << "sizeof(L) : " << sizeof(L) << endl; // here inherited double and int both would force to padding and hence size is 16 cout << "sizeof(M) : " << sizeof(M) << endl; return 0; }

PolymorphicClassSize