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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class B{};
  5. template<class T1,class T2,class T3=B>class E{};   //<- "class T3=B"
  6. //^ library
  7.  
  8. //v user
  9. class C{};
  10. template<class T1,class T3=B> using F=E<T1,C,T3>;  //<- "class T3=B" is duplicated
  11. int main() {
  12.     F<B> f1;
  13.     F<B,C> f2;
  14.     return 0;
  15. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/0XZViK
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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