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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4.  
  5. using namespace std;
  6.  
  7. class Base {
  8. public:
  9.  
  10.     Base(const string& s) {
  11.         m_s = s;
  12.     }
  13.  
  14.     virtual ~Base() {
  15.     };
  16.  
  17.     friend ostream & operator <<(ostream & os, const Base & b) {
  18.         b.print(os);
  19.         return os;
  20.     }
  21.  
  22.     virtual void print(ostream & os) const {
  23.         os << "Base";
  24.     }
  25.  
  26.     string m_s;
  27. };
  28.  
  29. class Derived : public Base {
  30. public:
  31.  
  32.     Derived(const string& s, int i) : Base(s) {
  33.         m_int = i;
  34.     }
  35.  
  36.     virtual void print(ostream & os) const {
  37.         os << "Derived";
  38.     }
  39.  
  40.     int m_int;
  41. };
  42.  
  43. class Store {
  44. public:
  45.  
  46.     Store(const string& s) {
  47.         m_s = s;
  48.     }
  49.  
  50.     void Add(const Base& b) {
  51.         cout << b << endl; //output before storing to vector
  52.         v.push_back(&b);
  53.     }
  54.  
  55.     friend ostream & operator <<(ostream & os, const Store & x);
  56.  
  57.     string m_s;
  58.     vector<const Base*> v;
  59. };
  60.  
  61. ostream & operator <<(ostream & os, const Store & x) {
  62.     for (auto it = x.v.cbegin(); it != x.v.cend(); ++it) {
  63.         cout << *(*it) << endl;
  64.     }
  65.     return os;
  66. }
  67.  
  68. int main() {
  69.     Store a("aaaaaaa");
  70.     a.Add(Derived("abc", 5));
  71.     a.Add(Derived("def", 6));
  72.  
  73.     cout << endl;
  74.     cout << a; //output after storing to vector
  75.  
  76.     return 0;
  77. }
  78.  
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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Derived
Derived

Base
Base
https://ideone.com/nmJCUl
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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