1. Introduction
2. Methods Theory
3. Coding
4. Linked List
5. Main Loop
6. Final bit of code
7. Conclusion

Comments

1. joe.andresen
   27 Jul 2005 at 20:11

   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?!?!
   

2. Developer Fusion Bot
   01 Jan 1999 at 00:00

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