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  1. #include <type_traits>
  2.  
  3. template<typename T>
  4. class RefCountedRecycle
  5. {
  6. public:
  7.   template<typename U>
  8.   static typename std::enable_if<std::is_convertible<U,T>::value, void>::type 
  9.     Destruct(U *item);
  10.  
  11.   template<typename U>
  12.   static typename std::enable_if<!std::is_convertible<U,T>::value, void>::type 
  13.     Destruct(U *item) = delete;
  14. };
  15.  
  16. template<typename T, typename U>
  17. typename std::enable_if<std::is_convertible<U,T>::value, void>::type 
  18.   RefCountedRecycle<T>::Destruct(U *item)
  19. {
  20.   auto p = static_cast<T*>(item);
  21.   p->Recycle();
  22. }
  23.  
  24. int main()
  25. {
  26.     return 0;
  27. }
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:18:41: error: invalid use of incomplete type ‘class RefCountedRecycle<T>’
prog.cpp:4:7: error: declaration of ‘class RefCountedRecycle<T>’
stdout
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Standard output is empty
https://ideone.com/m6AfpE
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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