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  1.  
  2. template<typename T>
  3. struct Outer
  4. {
  5.     struct Inner;
  6.  
  7.     auto f(Inner) -> void;
  8. };
  9.  
  10. template<class T>
  11. auto Outer<T>::f(Inner) -> void
  12. {
  13.  
  14. }
  15.  
  16. int main() {}
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:11:23: error: variable has incomplete type 'Outer::Inner'
auto Outer<T>::f(Inner) -> void
                      ^
prog.cpp:5:12: note: forward declaration of 'Outer::Inner'
    struct Inner;
           ^
1 error generated.
stdout
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Standard output is empty
https://ideone.com/pZbUas
language:
C++14 (clang 8.0)
created:
4 years ago
visibility:
public

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