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  1. #include <iostream>
  2.  
  3. struct X
  4. {
  5. 	template <typename F>
  6. 	auto accept(F && f)
  7. 	{
  8. 		return [this, &f](auto &&... args) {
  9. 			return f(this, std::forward<decltype(args)>(args)...); };
  10. 	}
  11.  
  12. 	virtual void foo() const { std::cout << "base\n"; }
  13. };
  14.  
  15. struct Y : X
  16. {
  17. 	void foo() const override { std::cout << "derived\n"; }
  18. };
  19.  
  20.  
  21. int main()
  22. {
  23. 	Y y;
  24. 	X * p = &y;
  25.  
  26. 	(p->*(&X::foo))();
  27.  
  28. 	p->accept([](X * that){that->X::foo();});
  29. }
Success #stdin #stdout 0s 3096KB
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derived
https://ideone.com/h4QXUi
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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