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  1. #include <iostream>
  2. #include <string>
  3. #include <map>
  4. #include <memory>
  5. using namespace std;
  6.  
  7. struct parent_class {
  8. 	virtual void say_hello() { cout << "Hello, I'm parent"<<endl; }
  9. 	virtual ~parent_class() {}
  10. };
  11. struct child_class : parent_class {
  12. 	void say_hello() override { cout << "Hello, I'm child"<<endl; }
  13. };
  14.  
  15. template <typename T>
  16. void do_dope_stuff(int arg1, std::map<uint32_t, shared_ptr<T>>& my_object){
  17.     //do some programmer magic
  18.     for (auto &x:my_object) {
  19.     	cout << x.first<<": ";
  20.         x.second->say_hello();
  21.     }
  22. }
  23.  
  24. int main() {
  25. 	std::map<uint32_t, shared_ptr<parent_class>> my_map;
  26. 	my_map[777]=make_shared<parent_class>(); 
  27. 	my_map[911]=make_shared<child_class>(); 
  28. 	my_map[89]=make_shared<parent_class>(); 
  29. 	do_dope_stuff(1, my_map);
  30.  
  31. 	cout << endl<<"second try:"<<endl; 
  32. 	std::map<uint32_t, shared_ptr<child_class>> his_map;
  33. 	his_map[888]=make_shared<child_class>(); 
  34. 	his_map[912]=make_shared<child_class>(); 
  35. 	do_dope_stuff(1, his_map);
  36.  
  37.  
  38.  
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 3464KB
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stdin
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Standard input is empty
stdout
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89: Hello, I'm parent
777: Hello, I'm parent
911: Hello, I'm child

second try:
888: Hello, I'm child
912: Hello, I'm child
https://ideone.com/EBUklE
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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