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  1. #include <iostream>
  2. #include <memory>
  3. using namespace std;
  4. struct A;
  5. struct B;
  6. struct Base {
  7. 	int y;
  8. 	static std::unique_ptr<Base> create( size_t n );
  9.     virtual ~Base() { }
  10. };
  11. struct A : public Base {int a; virtual ~A(){};};
  12. struct B : public Base {int b; virtual ~B(){};};
  13.  
  14. std::unique_ptr<Base> Base::create( size_t n ){
  15.   	if( n == 1 ) return  std::unique_ptr<Base>(new A );
  16.      else  return  std::unique_ptr<Base>(new B );
  17. }
  18.  
  19. int main() {
  20. 	auto x = static_cast<A*>( Base::create(1).get() );
  21. 	x->y=1;
  22. 	x->a=2;
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/wGKclN
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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