fork download
copy 
  1. #include <iostream>
  2. #include <vector>
  3.  
  4. class Base
  5. {
  6. public:
  7.     virtual ~Base() { }
  8.  
  9.     virtual void Print() const { std::cout << "Base\n"; }
  10.     virtual Base* Clone() const = 0;
  11. };
  12.  
  13. class Derived : public Base
  14. {
  15. public:
  16.  
  17.     void Print() const { std::cout << "Derived\n"; }
  18.     Derived* Clone() const { return new Derived(*this); }
  19. };
  20.  
  21. class Container
  22. {
  23. private:
  24.     std::vector<Base*> m_collection;
  25. public:
  26.     void Add(const Base& objectToAdd)
  27.     {
  28.         Base* copyOfBase = objectToAdd.Clone();
  29.         m_collection.push_back(copyOfBase);
  30.     }
  31.  
  32.     Base* GetObjectAtIndex(int index) const
  33.     {
  34.         return index < m_collection.size() ? m_collection.at(index) : NULL;
  35.     }
  36.  
  37.     ~Container()
  38.     {
  39.         for (auto &obj : m_collection)
  40.         {
  41.             delete obj;
  42.         }
  43.  
  44.         m_collection.clear();
  45.     }
  46. };
  47.  
  48. int main(int argc, const char* argv[])
  49. {
  50.     Container myContainer;
  51.  
  52.     Derived derivedObject;
  53.  
  54.     myContainer.Add(derivedObject);
  55.  
  56.     Base* retrievedObject = myContainer.GetObjectAtIndex(0);
  57.  
  58.     if (retrievedObject)
  59.     {
  60.         retrievedObject->Print();
  61.     }
  62.  
  63.     return 0;
  64. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Derived
https://ideone.com/NqBs3T
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!