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  1. #include <iostream>
  2. #include <memory>
  3. #include <queue>
  4.  
  5. using namespace std;
  6.  
  7. class Base {
  8.     public:
  9.         Base() = default;
  10.         virtual ~Base() = default;
  11.         virtual void run() = 0;
  12. };
  13.  
  14. class Derived1: public Base {
  15.     public:
  16.         Derived1() = default;
  17.         virtual ~Derived1() = default;
  18.         void run() { cout << "Derived1" << endl; }
  19. };
  20.  
  21. class Derived2: public Base {
  22.     public:
  23.         Derived2() = default;
  24.         virtual ~Derived2() = default;
  25.         void run() { cout << "Derived2" << endl; }
  26. };
  27.  
  28. void doSomething(std::shared_ptr<Base> ptr) {
  29. 	cout << "Ptr: " << typeid(ptr).name() << endl;
  30. 	cout << "Obj: " << typeid(*ptr).name() << endl;
  31.     ptr->run();
  32. }
  33.  
  34. void copyPtr(const std::shared_ptr<Base>& in, std::shared_ptr<Base>& out)
  35. {
  36. 	std::queue<std::shared_ptr<Base>> q;
  37.  
  38. 	q.push(in);
  39. 	out = q.front();
  40. 	q.pop();
  41. }
  42.  
  43. int main() {
  44. 	std::shared_ptr<Base> ptr;
  45.  
  46.     doSomething(std::make_shared<Derived1>());
  47.     doSomething(std::make_shared<Derived2>());
  48.  
  49.     copyPtr(std::make_shared<Derived1>(), ptr);
  50.     doSomething(ptr);
  51.     copyPtr(std::make_shared<Derived2>(), ptr);
  52.     doSomething(ptr);
  53. }
  54.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Ptr: St10shared_ptrI4BaseE
Obj: 8Derived1
Derived1
Ptr: St10shared_ptrI4BaseE
Obj: 8Derived2
Derived2
Ptr: St10shared_ptrI4BaseE
Obj: 8Derived1
Derived1
Ptr: St10shared_ptrI4BaseE
Obj: 8Derived2
Derived2
https://ideone.com/ZC0ZW0
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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