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  1. template<typename T, typename U>
  2. struct TemplateClass;
  3.  
  4. template<typename T, typename U = typename TemplateClass<T, void>::DefaultU>
  5. struct TemplateClass {
  6.  
  7.   class DefaultU {
  8.     T foo;
  9.     /* ... */
  10.   };
  11.  
  12.  
  13.   T& baz;
  14.   U bar;
  15.   /* ... */
  16. };
  17.  
  18.  
  19. int main()
  20. {
  21.  
  22. 	int a = 0;
  23. 	TemplateClass<int, int>::DefaultU b;
  24. 	TemplateClass<int, decltype(b)> foo = {a, b};
  25. }
Success #stdin #stdout 0s 3464KB
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stdout 
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https://ideone.com/DUaU60
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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