binary search tree - BST on c++ error -

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i tried create bst on cpp done class node in class tree because it's logical. header:

class node; class tree { public:     node* root;     tree();     tree(int val);     void insert(int val);     class  node     {     public:         node();         node(int val);         node* right;         node* left;         int val;     };  };

implamation:

tree::tree() {     this->root = null;  } tree::node::node() {  } tree::node::node(int val) {     this->val = val;     this->left = null;     this->right = null; } void tree::insert(int val) {      this->root = new node(3);  }

i got error on 

this->root = new node(3);   intellisense: value of type "tree::node *" cannot assigned entity of type "node *"    error c2440 : '=' : cannot convert 'tree::node *' 'node *'

what did done wrong please? root node* , new node (3) return node* problem? thanks!!!

to understanding, in current implementation, declaring 2 classes name node; 1 in global scope while other 1 in scope of class tree. can solved using 1 class.


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