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  1. #include <iostream>
  2.  
  3. template<typename T, typename K>
  4. struct A{
  5.   template<typename L>
  6.   friend std::ostream& operator<<(std::ostream& out, L const &x);
  7. };
  8.  
  9. template<typename T>
  10. std::ostream& operator<<(std::ostream& out, T const &x) {
  11.   (void) x; // to silent the compiler
  12.     // ...
  13.     return out;
  14. }
  15.  
  16. int main(){
  17.   A<int, int> i;
  18.   A<double, int> j;
  19.  
  20.   (void)i;
  21.   (void)j;
  22. }
Success #stdin #stdout 0s 3336KB
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https://ideone.com/ccimDR
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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