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  1. template <typename T>
  2. struct Foo
  3. {
  4.     struct Bar
  5.     {
  6.         template <typename V>
  7.         friend void swap(typename Foo<V>::Bar&, typename Foo<V>::Bar&);
  8.     };
  9. };
  10.  
  11. template <typename T>
  12. void swap(typename Foo<T>::Bar& b1, typename Foo<T>::Bar& b2) { }
  13.  
  14. template class Foo<int>;
  15.  
  16. int main()
  17. {
  18.     Foo<int>::Bar  bb1, bb2;
  19.     swap<int>(bb1, bb2);
  20. }
Success #stdin #stdout 0.02s 2676KB
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https://ideone.com/zZMYn
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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