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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template<typename T>
  5. typename std::enable_if<std::is_polymorphic<T>::value, void*>::type
  6. startOfObject(T* p)
  7. {
  8.     std::cout << "is polymorphic" << std::endl;
  9.     return dynamic_cast<void*>(p);
  10. }
  11.  
  12. template<typename T>
  13. typename std::enable_if<!std::is_polymorphic<T>::value, void*>::type
  14. startOfObject(T* p)
  15. {
  16.     std::cout << "is not polymorphic" << std::endl;
  17.     return static_cast<void*>(p);
  18. }
  19.  
  20. class C {};
  21. class Polymorphic { public: virtual ~Polymorphic() {} };
  22.  
  23.  
  24. int main() {
  25.     C c;
  26.     Polymorphic p;
  27.  
  28.     startOfObject(&c);
  29.     startOfObject(&p);
  30.     return 0;
  31. }
  32.  
  33.  
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
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Standard input is empty
stdout
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is not polymorphic
is polymorphic
https://ideone.com/h7FRTI
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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