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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<class T = int>
  5. struct A {
  6. 	using Int = T;
  7. 	virtual void pr() {
  8. 		cout << "A fire\n";
  9. 	}
  10. };
  11. template<class T>
  12. struct B : public A<T> {
  13. 	virtual void pr() override {
  14. 		Int a;
  15. 		cout << "B fire\n";
  16. 	}
  17. };
  18.  
  19. int main() {
  20. 	A<>* b = new B<int>();
  21. 	A<>* c = b;
  22. 	delete b;
  23. 	c->pr();
  24. 	// your code goes here
  25. 	return 0;
  26. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In member function ‘virtual void B<T>::pr()’:
prog.cpp:14:3: error: ‘Int’ was not declared in this scope
   Int a;
   ^~~
stdout
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Standard output is empty
https://ideone.com/ZZNLKo
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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