help needed with: error with constructor c++

[slizorn]

hi guys,
i get the following error when i try to create a new TreeNode

 error C2514: 'TreeNode' : class has no constructors
 

this error is caused by the following line:

treeObj->root = new TreeNode(oneline.c_str());
 

and i have declared the following as a global variable:

TreeNode<char> *treeNodeObj = NULL;
 

i am very puzzled abt this because my constructor has already been declared...
i have attached the code for the TreeNode.h below:

#pragma once
#include <iostream>
#include <fstream>
#include <string>
#include <deque>
#include <queue>
using namespace std;
 
template <class T>
class TreeNode
{
    public:
        TreeNode<T>(T newItem);
        ~TreeNode<T>(void);
        void setItem(T newItem);
        void setLeft(TreeNode *newLeft);
        void setRight(TreeNode *newRight);
        T getItem();
        TreeNode<T>* getLeft();
        TreeNode<T>* getRight();
        bool IsSameNode(T c);
        T item;
 
    private:
        TreeNode *left;
        TreeNode *right;
};
 
 
template <class T>
TreeNode<T>::TreeNode(T newItem)
{
    item = newItem;
    left = NULL;
    right = NULL;
}
 
template <class T>
TreeNode<T>::~TreeNode(void)
{
}
 
 
template <class T>
void TreeNode<T>::setItem(T newItem) 
{
    // set methods
    item = newItem;
}
 
template <class T>
void TreeNode<T>::setLeft(TreeNode *newLeft) 
{
    left = newLeft;
}
 
template <class T>
void TreeNode<T>::setRight(TreeNode *newRight) 
{
    right = newRight;
}
 
template <class T>
T TreeNode<T>::getItem()
{
    // get methods
    return item;
}
 
template <class T>
TreeNode<T>* TreeNode<T>::getLeft() 
{
    return left;
}
 
template <class T>
TreeNode<T>* TreeNode<T>::getRight() 
{
    return right;
}
 
template <class T>
bool TreeNode<T>::IsSameNode(T c)
{
    return this->item == c;
}
 

any help or suggestion is appreciated so please leave a comment below and i will reply within 5 mins cos i will check this forum every 5mins..
thanks :)

[JosAH]

Unless I'm totally blind, you have a ctor for a char but not for a char*.

kind regards,

Jos

[weaknessforcats]

The string::c_str() returns a const char*.

Your root would have to be:

TreeNode<const char*> root(str.c_str());
 

for the code to compile and link.