From: <l AT delorie DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: template friend
Date: Sun, 28 May 2000 21:43:24 +0200
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

How do I declare a class template a friend of another class template?
  I'm thinking of a situation like outlined below.
What's the correct syntax  - in ANSI-C++
                                        - for DJGPP 2.03  ?

/*---------------------------------------------------------------------*/

template<class T> class One
{
  public:
  One(T b) : a(b) {}

  void SetValue(Two<T> &c)
  {
    c.x=a;
  }

  T a;
};


template<class TT> class Two
{
  friend class One<TT>;

  public:
  Two(TT y) : x(y) {}

  private:
  TT x;
};



void main()
{
  int i=3;
  int j=4;

  One<int> a(i);
  Two<int> b(j);

  a.SetValue(b);
}

/*---------------------------------------------------------------------*/

unbenannt.cpp:10: parse error before `>'
unbenannt.cpp: In method `void One<int>::SetValue(...)':
unbenannt.cpp:37:   instantiated from here
unbenannt.cpp:12: `c' undeclared (first use this function)
unbenannt.cpp:12: (Each undeclared identifier is reported only once
unbenannt.cpp:12: for each function it appears in.)

/*---------------------------------------------------------------------*/