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  1. #include <iostream>
  2. #include <vector>
  3. #include <memory>
  4.  
  5. using namespace std;
  6.  
  7. class Object {
  8. public: 
  9. 	virtual void input(istream& is) {
  10. 		cout << "input from base"<<endl; 
  11. 	}
  12. };
  13. class Derived : public Object {
  14. public: 
  15. 	void input (istream& is) override {
  16. 		cout << "input from derived"<<endl; 
  17. 	}
  18. };
  19.  
  20. std::vector<std::shared_ptr<Object>> arr;
  21.  
  22. bool InputArray(std::shared_ptr<Object> obj) {
  23.     //...
  24.     obj->input(cin);
  25.     arr.push_back(obj);  // no need for nelem.  Use arr.size() instead
  26.     return true;
  27. }
  28.  
  29. int main() {
  30. 	shared_ptr<Object> p1 = make_shared<Object>(), p2 = make_shared<Derived>(); 
  31. 	InputArray (p1); 
  32. 	InputArray (p2); 
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
input from base
input from derived
https://ideone.com/moDdjL
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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