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#include <iostream> using namespace std; class Base { public: virtual void fun() { cout << "Base::fun" << endl; } void show() { fun(); } }; class Drive : public Base { public: virtual void fun() { cout << "Drive::fun" << endl; } }; int main() { Drive d; d.show(); return 0; } |
#include <iostream> using namespace std; class Base { public: Base() { fun(); } virtual void fun() { cout << "Base::fun" << endl; } }; class Drive : public Base { public: virtual void fun() { cout << "Drive::fun" << endl; } }; int main() { Drive d; return 0; } |
#include <iostream> using namespace std; class Base { public: Base() { cout << "In Base" << endl; cout << "This Pointer = " << (int*)this << endl; cout << endl; } virtual void f() { cout << "Base::f" << endl; } }; class Drive : public Base { public: Drive() { cout << "In Drive" << endl; cout << "This Pointer = " << (int*)this << endl; cout << endl; } virtual void f() { cout << "Drive::f" << endl; } }; int main() { Drive d; cout << "In Main" << endl; cout << (int*)&d << endl; return 0; } |
In Base This Pointer = 0012FF7C In Drive This Pointer = 0012FF7C In Main 0012FF7C |
#include <iostream> using namespace std; class Base { public: Base() { cout << "In Base" << endl; cout << "Virtual Pointer = " << (int*)this << endl; cout << "Address of Vtable = " << (int*)*(int*)this << endl; cout << "Value at Vtable = " << (int*)*(int*)*(int*)this << endl; cout << endl; } virtual void f1() { cout << "Base::f1" << endl; } }; class Drive : public Base { public: Drive() { cout << "In Drive" << endl; cout << "Virtual Pointer = " << (int*)this << endl; cout << "Address of Vtable = " << (int*)*(int*)this << endl; cout << "Value at Vtable = " << (int*)*(int*)*(int*)this << endl; cout << endl; } virtual void f1() { cout << "Drive::f2" << endl; } }; int main() { Drive d; return 0; } |
In Base Virtual Pointer = 0012FF7C Address of Vtable = 0046C08C Value at Vtable = 004010F0 In Drive Virtual Pointer = 0012FF7C Address of Vtable = 0046C07C Value at Vtable = 00401217 |
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