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  1. #include <iostream>
  2. #include <future>
  3. using namespace std;
  4. struct Parent {
  5. 	virtual void a() { cout << "I am parent"; }
  6. };
  7. struct Child : Parent {
  8. 	virtual void a() { cout << "I am child"; }
  9. };
  10.  
  11. Child g_c;
  12.  
  13. int main() {
  14. 	std::future<Parent&> p = async(launch::async, []() -> Parent& { return g_c; });
  15. 	auto c = dynamic_cast<Child&>(p.get());
  16. 	c.a();
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 5528KB
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Standard input is empty
stdout
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I am child
https://ideone.com/4Qmjvc
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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