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  1. #include <iostream>
  2. #include <vector>
  3. #include <memory>
  4.  
  5. class Task {
  6.     public:
  7.         Task(std::vector<std::unique_ptr<Task>> *list) {
  8.         	if (list)
  9.             	list->push_back(clone());
  10.         }
  11.  
  12.         virtual void Run() {
  13.             std::cout << "Called Task Run!" << std::endl;
  14.         }
  15.         virtual std::unique_ptr<Task> clone(){ return std::make_unique<Task>(*this);  }
  16. };
  17.  
  18. class OverrideTask : public Task {
  19.     public:
  20.         OverrideTask(std::vector<std::unique_ptr<Task>> *list) : Task(nullptr) {
  21.         	if (list)
  22.             	list->push_back(clone());
  23.         }
  24.         void Run() override {
  25.             std::cout << "Called Override Run!" << std::endl;
  26.         }
  27.         std::unique_ptr<Task> clone() override { return std::make_unique<OverrideTask>(*this); } 
  28. };
  29.  
  30. int main() {
  31.     std::cout << "Main method entered" << std::endl;
  32.     std::vector<std::unique_ptr<Task>> listOfTasks;
  33.  
  34.     OverrideTask ot = OverrideTask(&listOfTasks);
  35.     Task t = Task(&listOfTasks);
  36.  
  37.     for(int i = 0; i < listOfTasks.size(); i++) {
  38.         listOfTasks[i]->Run(); // Will print "Called Task Run!" twice.
  39.     }
  40.  
  41.     ot.Run(); // Prints "Called Override Run!"
  42.     t.Run(); // Prints "Called Task Run!"
  43. }
Success #stdin #stdout 0s 4788KB
comments (?)
stdin
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Standard input is empty
stdout
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Main method entered
Called Override Run!
Called Task Run!
Called Override Run!
Called Task Run!
https://ideone.com/GXZ1jX
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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