ERROR,C++,data structures,teaching myself,setback?

I am teaching myself C++ %26amp; data structures these days, and now I encountered a UNBELIEVABLE setback!


I have been busy solving it right now and I feel exhausted.





Please take your time and check my code, it's an unbelieve error.





"class List" is inherited from base class "ablist".





I wondered why accessing "pHead""length" etc; is forbidden in class list, even they are inherited from "ablist"?


I hve to use "ablist %26lt;type%26gt;::pHead" to access to pHead.





//*************************//


//ListNode


//*************************//





template %26lt;class type%26gt;


class ListNode


{


public:


ListNode();


type data;


ListNode %26lt;type%26gt;* pNext;


};





//Fuction(){codes..}..





//*************************//


//ablist


//*************************//





template %26lt;class type%26gt;


class ablist


{


public:


ListNode %26lt;type%26gt; *pHead;


ListNode %26lt;type%26gt; *pCurrent;


ListNode %26lt;type%26gt; *pTail;


int length;


//Fuction(){codes..}..


};


//Fuction(){codes..}..


//***********

ERROR,C++,data structures,teaching myself,setback?
I'm not sure why you need your List class as defined, but you could write List%26lt;type%26gt;::pHead instead of ablist%26lt;type%26gt;::pHead in your List class operations, if you prefer. Trying to reference pHead by itself isn't valid, since it's defined in terms of %26lt;type%26gt;.





It seems like you could do away with your List class, and instantiate whatever kinds of ablist classes you need. E.g.:





typedef ablist%26lt;int%26gt; IntListInst;





class IntList : public IntListInst


{


// ... implementation of ablist operations


};