Question

This is header file for my binary tree.
I have a class called TreeNode and of course BinaryTree class have a pointer to its root.

And I got following Three errors

error C2143: syntax error : missing ';' before '*'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

And Code for BinaryTree header file

#pragma once

#include <fstream>
#include <iostream>
#include "Node.h"
using namespace std;

class BinaryTreeStorage
{
private:
    TreeNode* root;

public:
    //Constructor
    BinaryTreeStorage(void);

    //Gang Of Three
    ~BinaryTreeStorage(void);
    BinaryTreeStorage(const BinaryTreeStorage & newBinaryTreeStorage);
    BinaryTreeStorage& operator=(const BinaryTreeStorage & rhs);

    //Reading and writing
    ofstream& write(ofstream& fout);
    ifstream& read(ifstream& fin);

};

//Streaming
ofstream& operator<<(ofstream& fout, const BinaryTreeStorage& rhs);
ifstream& operator>>(ifstream& fin, const BinaryTreeStorage& rhs);

error appears to be at line 11

    TreeNode* root;

I have spent few days trying to get rid of this error and completely devastated.

Is this error about wrong namespace ? Or maybe TreeNode class not declared right?

And just in case code for TreeNode header file

#pragma once
#include <string>
#include "BinaryTreeStorage.h"

using namespace std;

class TreeNode
{
private:
    string name;
    TreeNode* left;
    TreeNode* right;

public:
    //Constructor
    TreeNode(void);
    TreeNode(string data);

    //Gang of Three
    ~TreeNode(void);
    TreeNode(const TreeNode* copyTreeNode);


    //Reading and writing
    ofstream& write(ofstream& fout);

    //Add TreeNode
    void addTreeNode(string data);

    //Copy tree
    void copy(TreeNode* root);
};

Thank you in advance.

Answer 1

Instead of

#include "Node.h"

simply forward declare the class:

class TreeNode;

Also, why are you including BinaryTreeStorage.h in Node.h? There’s no need for it, so remove it.