Class c++ error -

I have a problem, I have classes that work now, because I have a specialty in the public, but If I inherited it in private, or protected and second class, then this is not work, how can I do this? I need to respect OOP rules

  template & lt; Typename T & gt; Class BinaryNode {public: T key; Binernode & lt; T & gt; * Left; Binernode & lt; T & gt; * Right; Binernode & lt; T & gt; * Guardian; Binarynode () {} ~ Binarineode () {}}; And this: Template & lt; Typename T & gt; Class BinarySearchTree {Private: Binernode & lt; T & gt; * Route; Binernode & lt; T & gt; * NewNode (T key); BinaryNode & lt; T & gt; * Minimum (binary node & lt; T & gt; * node); Binernode & lt; T & gt; * Maximum (binary node & lt; T & gt; * node); BinaryNode & lt; T & gt; * Successor (Binarineod  * node); Enter zero (binary node & lt; T & gt; ** node, t key); BinaryNode & lt; T & gt; * Search (Binernode & lt; T & gt; * node, T key); Zero distance (BinaryNode & lt; T & gt; * node, T key); Zero inorderTreeWalk (BinaryNode & lt; T & gt; * node); Public: BinarySearchTree (); ~ BinarySearchTree (); Insert zero (T key); Binernode & lt; T & gt; * Search (T key); Zero distance (t key); Zero Undertworld (); BinaryNode & lt; T & gt; * Remove (BinaryNode & lt; T & gt; * node); };  

The header file is:

Can you show me how I can do it? Thanks, By

You can BinarySearchTree to BinaryNode of a Friends class .

  template & lt; Typename T & gt; Class binary search; // Next Announcement Template & lt; Typename T & gt; Class BinaryNode {Friend class BinarySearchTree & lt; T & gt; // We only allow BinarySearchTree with the same template t access: // you make what you want to personalize}  

In this way, BinarySearchTree will be able to use the private sector Access is allowed for BinaryNode

Note that you do not need to create empty default constructor / destructors.

The following lines are not required:

  BinaryNode () {} ~ BinaryNode () {}  

< P> [edit: Added template logic. See for other possibilities]