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  1. // Copyright 2016 Aleksandr Mikhailov
  2.  
  3. #include <bits/stdc++.h>
  4.  
  5. class A {
  6.   public:
  7.     virtual void f() {
  8.       std::cout << "A::f()" << std::endl;
  9.     }
  10.     virtual void g() {
  11.       std::cout << "A::g()" << std::endl;
  12.     }
  13. };
  14.  
  15. class B {
  16.   public:
  17.     virtual void f() {
  18.       std::cout << "B::f()" << std::endl;
  19.     }
  20.     virtual void g() {
  21.       std::cout << "B::g()" << std::endl;
  22.     }
  23. };
  24.  
  25. int main() {
  26.     std::ios_base::sync_with_stdio(false);
  27.     std::cin.tie(nullptr);
  28.     A * p_a = new A();
  29.     B * p_b = new B();
  30.     p_a->f();
  31.     p_a->g();
  32.     p_b->f();
  33.     p_b->g();
  34.     size_t * vptr_a = reinterpret_cast<size_t *>(p_a);
  35.     size_t * vptr_b = reinterpret_cast<size_t *>(p_b);
  36.     std::swap(*vptr_a, *vptr_b);
  37.     p_a->f();
  38.     p_a->g();
  39.     p_b->f();
  40.     p_b->g();
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0s 3456KB
comments (?)
stdin 
Standard input is empty
stdout 
A::f()
A::g()
B::f()
B::g()
B::f()
B::g()
A::f()
A::g()
https://ideone.com/CEkkmN
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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