我正在研究一个二叉树程序，当调用我的插入函数时，它似乎插入了正在输入的值，而在检查该值时，我什么也没有得到，现在我很难过，我可能遗漏了什么或有什么问题？我已经提供了类数据和下面的插入/搜索函数定义，我只是觉得这与我的模板实现有关，或者只是模板的一般帮助？
struct node
{
string keyValue; //value to stored that is being searched for in our tree
node *left; //left side of pointing tree from parent node
node *right; //right side of pointing tree from parent node
};
template <class T>
class Tree
{
public:
Tree(); //constructor
~Tree(); //destructor
void displayTree();
void insertTree(T key);
node *searchTree(T key);
void deleteTree();
private:
node *root; //points to the root point of our tree
void displayTree(node *leaf);
void insertTree(T key, node *leaf); //takes in our keyValue to
void deleteTree(node*leaf);
node *search(T key, node *leaf);
};
template <class T>
void Tree<T>::insertTree(T key)
{
cout << "instert1" << endl;
if(root != NULL)
{
cout << "instert2" << endl;
insertTree(key, root);
}
else
{
cout << "inster else..." << endl;
root = new node;
root->keyValue = key;
cout << root->keyValue << "--root key value" << endl;
root->left = NULL;
root->right = NULL;
}
}
template <class T>
void Tree<T>::insertTree(T key, node *leaf)
{
if(key < leaf->keyValue)
{
if(leaf->left != NULL)
{
insertTree(key, leaf->left);
}
else //descend tree to find appropriate NULL node to store keyValue (left side of tree)
{
leaf->left = new node; //Creating new node to store our keyValue (data)
leaf->left -> keyValue = key;
leaf->left -> left = NULL; //Assigning left and right child of current child node to NULL
leaf->left -> right = NULL;
}
}
else if(key >= leaf->keyValue)
{
if(leaf->right != NULL)
{
insertTree(key, leaf->right);
}
else //descend tree to find appropriate NULL node to store keyValue (right side of tree)
{
leaf->right = new node; //Creating new node to store our keyValue (data)
leaf->right -> keyValue = key;
leaf->right -> right = NULL; //Assigning left and right child of current child node to NULL
leaf->right -> left = NULL;
}
}
}
template <class T>
node *Tree<T>::searchTree(T key)
{
cout << "searching for...key: " << key << " and given root value:" << endl;
return search(key, root);
}
template <class T>
node *Tree<T>::search(T key, node*leaf)
{
if(leaf != NULL)
{
cout << "check passed for search!" << endl;
if(key == leaf->keyValue)
{
return leaf;
}
if(key < leaf->keyValue)
{
return search(key, leaf->left);
}
else
{
return search(key, leaf->right);
}
}
else
{
cout << key << " Not found...!" << endl;
return NULL;
}
}