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AI 1 - Problem Solving (Artificial intelligence)

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  9 years ago

  by Developer Fusion Bot

  Developer Fusion Bot

  , United Kingdom

  Joined 2 years ago

  This thread is for discussions of AI 1 - Problem Solving (Artificial intelligence).

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  3 years ago

  by joe.andresen

  joe.andresen

  , United States

  Joined 3 years ago

  i need help with an error im recieving.
  

  
  i have a template linked list class
  

  
  template <class LT>
  class LList
  {
  private:
   class LNode
     {
     public:
       LNode ();
       LT data;
       LNode * next;
     };
  

  
  public:
   LList();
   LList( const LList & other);
   ~LList ();
   LList & operator = (const LList & other);
   bool operator == (const LList & other);
   int Size() const;
   friend ostream & operator << <> (ostream & outs, const LList<LT> & L);
   bool InsertFirst (const LT & value);
   bool InsertLast (const LT & value);
   bool DeleteFirst ();
   bool DeleteLast ();
  private:
   LNode * first;
   int size;
  };
  

  
  and the friend function is giving me an error:
  

  
  template <class LT>
  ostream & operator << (ostream & outs, const LList<LT> & L)
  {
   if (L.first == NULL)
     return outs;
  

  
   outs << L.first -> data;
  

  
   for (LList<LT>::LNode * n = L.first -> next; n != NULL; n = n -> next)
    {
      outs << ' ' << n -> data;
    }
   return outs;
  }
  

  
  i get an error at the for loop... the error is :
  

  
  LLIST.tmp: In function std:<img src="images/smilies/redface.gif" width=15>stream& operator&lt;&lt;(std:<img src="images/smilies/redface.gif" width=15>stream&, const LList&lt;LT&gt;&)': <br> LLIST.tmp:111: error: n' undeclared (first use this function)
  LLIST.tmp:111: error: (Each undeclared identifier is reported only once for each function it appears in.)
  LLIST.tmp:33: error: LList&lt;int&gt;::LNode*LList&lt;int&gt;::first' is private <br> LLIST.tmp:106: error: within this context <br> LLIST.tmp:33: error: LList<int>::LNode*LList<int>::first' is private
  LLIST.tmp:109: error: within this context
  application.cpp:19:   instantiated from here
  LLIST.tmp:33: error: LList&lt;int&gt;::LNode*LList&lt;int&gt;::first' is private <br> LLIST.tmp:111: error: within this context <br> LLIST.tmp:111: error: dependent-name LList<LT>::LNode' is parsed as a non-type, but instantiation yields a type
  LLIST.tmp:111: note: say `typename  LList<LT>::LNode' if a type is meant
  

  
  i know these all have to do with friend and being private, what do i do?!?!
  

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