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POcannot access protected variable in derived class c++
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2010-10-22T02:35:03.867
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2010-10-22T02:47:21.317
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I have a Binary Search Tree as a derived class from a Binary Tree, right now I am trying to access the root for my recursive functions (which is in the base class). But for some reason I keep getting the error: <pre><code>binSTree.h:31: error: ‘root’ was not declared in this scope </code></pre> Here are my class declarations: base class: <pre><code>template <class T> class binTree { private: int height(treeNode<T>*) const; // Recursive method int size(treeNode<T>*) const; // Recursive method int leaves(treeNode<T>*) const; void insert(treeNode<T>*&, const T&); void clear(treeNode<T>*); treeNode<T>* copy_tree(treeNode<T>*); void preOrder(treeNode<T>*, void (*)(T&)); void inOrder(treeNode<T>*, void (*)(T&)); void postOrder(treeNode<T>*, void (*)(T&)); public: binTree(); binTree(const binTree<T>&); ~binTree(); bool empty() const; void clear(); void insert(const T&); int remove(const T&); // Extra credit only int height() const; // Non-recursive method int size() const; // Non-recursive method int leaves() const; void preOrder(void (*)(T&)); void inOrder(void (*)(T&)); void postOrder(void (*)(T&)); const binTree<T>& operator=(const binTree<T>&); protected: treeNode<T>* root; }; </code></pre> header file (to line 31): <pre><code>#include "binTree.h" template<class T> class binSTree : public binTree<T> { public: void insert(const T&); bool remove(const T&); bool search(const T&, int&) const; private: void insert(treeNode<T>*&, const T&); bool remove(treeNode<T>*&, const T&); bool search(treeNode<T>*, const T&, int&); void remove_root(treeNode<T>*&); }; template<class T> void binSTree<T>::insert(const T& x) { treeNode<T>* newNode = new treeNode<T>(x); insert(newNode, x); } template<class T> // public bool binSTree<T>::remove(const T& x) { return remove(binTree<T>.root, x); } template<class T> // public bool binSTree<T>::search(const T& x, int& len) const { len = 0; len = search(root,x,len); } </code></pre> I tried making the root public to see what would happen, and I still got the same error. any help would be much appreciated! 
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<c++><binary-tree><derived-class>
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cannot access protected variable in derived class c++
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1. PO
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