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Tip of the Day
Language: C++
Expertise: Advanced
Jun 18, 1999

Declare a Template Specialization as a Friend of a Class Template

You can declare a template specialization as a friend of a class template. In this example, the class template Vector declares the specialization C<void*> as its friend:

 
template <class T> class C{/*...*/};
template <class T> class Vector
{
public:
  //...
  friend class C<void*>; //other specializations are not friends of Vector
};

Each specialization of Vector has the specialization C<void*> as a friend. Note, however, that other specializations of the class template C, for instance C<int>, C<bool> etc., are not friends of Vector.

Danny Kalev
 
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