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  1. #include <iostream>
  2.  
  3. template <int K>
  4. struct postbox
  5. {
  6.     int val() const 
  7.     {
  8.       return K;
  9.     }
  10. };
  11.  
  12. template <int A, int B, int C>
  13. struct postoffice
  14. {
  15.   postbox<A> _a;
  16.  
  17.   template<int I>
  18.   postbox<I> get_postbox()
  19.   {
  20.     switch( I )
  21.     {
  22.       case A: return _a;
  23.     }
  24.   }
  25. };
  26.  
  27. template <typename PO>
  28. struct zipcode
  29. {
  30.   PO my_postoffice;
  31.  
  32.   template<int K>
  33.   postbox<K> get_postbox()
  34.   {
  35.     // The error is on this line
  36.     return my_postoffice.template get_postbox<K>();
  37.   }
  38. };
  39.  
  40. // Here's a function template that isn't a member, and it compiles.
  41. template<int D>
  42. int non_member_function_template()
  43. {
  44.   postoffice<123,345,678> po;
  45.   auto box = po.template get_postbox<D>();
  46.   return box.val(); 
  47. }
  48.  
  49. int main()
  50. {
  51.   std::cout << std::to_string(non_member_function_template<123>()) << std::endl;
  52. }
Success #stdin #stdout 0s 3468KB
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123
https://ideone.com/W0owY1
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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