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  1.     #include <iostream>
  2.  
  3.     struct A {
  4.         int i;
  5.         virtual void describe() {
  6.             std::cout << "A:" << i << std::endl;
  7.         }
  8.     };
  9.     struct B : public A {
  10.         char c;
  11.         virtual void describe() override {
  12.             // Assume a 'B' wants to also output the A stuff.
  13.             std::cout << "B:" << c << ":";
  14.             A::describe();
  15.         }
  16.     };
  17.     struct C : public B {
  18.         float f;
  19.         virtual void describe() override {
  20.             // Assume a 'C' wants to also output the B stuff and A stuff.
  21.             std::cout << "C:" << f << ":";
  22.             B::describe();
  23.         }
  24.     };
  25.  
  26.     #include <vector>
  27.  
  28.     int main() {
  29.         std::vector<A*> bar;
  30.         A a;
  31.         a.i = 10;
  32.         B b;
  33.         b.i = 22;
  34.         b.c = 'b';
  35.         C c;
  36.         c.i = 5;
  37.         c.c = 'X';
  38.         c.f = 123.456;
  39.         bar.push_back(&a);
  40.         bar.push_back(&b);
  41.         bar.push_back(&c);
  42.         for (size_t i = 0; i < bar.size(); ++i) {
  43.             bar[i]->describe();
  44.         }
  45.     }
  46.  
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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Standard input is empty
stdout
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A:10
B:b:A:22
C:123.456:B:X:A:5
https://ideone.com/12BEce
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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