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  1. #include <stdio.h>
  2. class A {
  3.  public:
  4.     A() : next(0) {
  5.         if (head == 0) {
  6.             head = this;
  7.         } else {
  8.             A* step = head;
  9.             while (step->next != 0) {
  10.                 step = step->next;
  11.             }
  12.             step->next = this;
  13.         }
  14.     }
  15.     virtual ~A() {
  16.         if (head == this) {
  17.             head = 0;
  18.         } else {
  19.             A* step = head;
  20.             while (step->next != this) {
  21.                 step = step->next;
  22.             }
  23.             step->next = next;
  24.         }
  25.     }
  26.  
  27.     static A* head;
  28.     A* next;
  29. };
  30.  
  31. class B : public A {
  32.  public:
  33.     B() {}
  34.     virtual ~B() {}
  35.     virtual void foo() {
  36.         printf("function foo\n");
  37.     }
  38. };
  39.  
  40. class C : public A {
  41.  public:
  42.     C() {}
  43.     virtual ~C() {}
  44.     virtual void bar() {
  45.         printf("function bar\n");
  46.     }
  47. };
  48.  
  49. class D : public B {
  50.  public:
  51.     D() {}
  52.     virtual ~D() {}
  53.     virtual void foo() {
  54.         printf("function foo from D\n");
  55.     }
  56. };
  57.  
  58. A* A::head = 0;
  59.  
  60. int main() {
  61.     A a_cls;
  62.     B b_cls;
  63.     C c_cls;
  64.     D d_cls;
  65.  
  66.     A* step = A::head;
  67.     B* step_b = 0;
  68.  
  69.     while (step != 0) {
  70.         step_b = dynamic_cast<B *>(step);
  71.         if (step_b != 0) {
  72.             step_b->foo();
  73.         }
  74.         step = step->next;
  75.     }
  76.  
  77.     return 0;
  78. }
  79.  
Success #stdin #stdout 0s 3096KB
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function foo
function foo from D
https://ideone.com/RgkTle
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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