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  1. #include <cassert>
  2.  
  3. struct A {
  4.     virtual ~A() noexcept = default;
  5. };
  6.  
  7. struct B : virtual public A {
  8.     virtual ~B() noexcept = default;
  9. };
  10.  
  11. struct C1 : public B {
  12.     virtual ~C1() noexcept = default;
  13. };
  14.  
  15. struct C2 : public B {
  16.     virtual ~C2() noexcept = default;
  17. };
  18.  
  19. struct D : public C1, public C2 {
  20.     virtual ~D() noexcept = default;
  21. };
  22.  
  23. int main() {
  24.     A *ptr = new D;
  25.     assert(dynamic_cast<D*>(ptr) != nullptr);  // ok
  26.     assert(dynamic_cast<B*>(ptr) == nullptr);  // ambigious sub-class B
  27. }
  28.  
Success #stdin #stdout 0s 3024KB
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https://ideone.com/21laCQ
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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