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  1. #include <memory>
  2.  
  3. template<class T>
  4. struct call_drop {
  5.     void operator()(T* p) const {p->drop();}
  6. };
  7.  
  8. template<class T, class U>
  9. std::unique_ptr<T, call_drop<T>> make_drop_unique(U&& obj)
  10. {return std::unique_ptr<T, call_drop<T>>(new T(std::forward<U>(obj)));}
  11. template<class T>
  12. std::unique_ptr<T, call_drop<T>> make_drop_unique()
  13. {return std::unique_ptr<T, call_drop<T>>(new T());}
  14.  
  15. struct thingy {
  16.     void drop(){};
  17. };
  18.  
  19. int main() {
  20.     auto ptr1 = make_drop_unique<thingy>(thingy());
  21.     auto ptr2 = make_drop_unique<thingy>();
  22. }
Success #stdin #stdout 0s 3056KB
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https://ideone.com/HnUeJK
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
secret

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