Could anyone help me fix this? It's driving me crazy. :(
I'm trying to use a Binary Search Tree template. But can't understand how to use it.
Errors:
error LNK2019: unresolved external symbol "public: class BSTNode<int> * * __thiscall BinarySearchTree<int>::search(int)"
(?search@?$BinarySearchTree@H@@QAEPAPAV?$BSTNode@H@@H@Z) referenced in function _WinMain@16
error LNK2019: unresolved external symbol "public: void __thiscall BinarySearchTree<int>::insert(int)" (?insert@?$BinarySearchTree@H@@QAEXH@Z)
referenced in function _WinMain@16
Source:
main.cpp
#include <windows.h>
#include "bst.h"
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
BinarySearchTree<int> *pList = new BinarySearchTree<int>;
pList->insert(2);
pList->insert(1);
pList->insert(3);
BSTNode<int> **data = pList->search(1);
int result = (*data)->getData();
delete pList;
return(0);
}
bst.cpp
/* Copyright (c) 2008 the authors listed at the following URL, and/or
the authors of referenced articles or incorporated external code:
http://en.literateprograms.org/Binary_search_tree_(C_Plus_Plus)?action=history&offset=20080521005910
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Retrieved from: http://en.literateprograms.org/Binary_search_tree_(C_Plus_Plus)?oldid=13424
*/
#include <algorithm>
#include "bst.h"
template <class T>
BSTNode<T>** BinarySearchTree<T>::search(T data) {
BSTNode<T>** node = &root;
while (*node != NULL) {
if (data < (*node)->data)
node = &(*node)->left;
else if ((*node)->data < data)
node = &(*node)->right;
else
break;
}
return node;
}
template <class T>
void BinarySearchTree<T>::insert(T data) {
BSTNode<T>** node = search(data);
if (*node == NULL) {
*node = new BSTNode<T>(data);
}
}
template <class T>
void BinarySearchTree<T>::delete_node(BSTNode<T>** node) {
BSTNode<T>* old_node = *node;
if ((*node)->left == NULL) {
*node = (*node)->right;
delete old_node;
} else if ((*node)->right == NULL) {
*node = (*node)->left;
delete old_node;
} else {
BSTNode<T>** pred = &(*node)->left;
while ((*pred)->right != NULL) {
pred = &(*pred)->right;
}
std::swap((*pred)->data, (*node)->data);
delete(pred);
}
}
bst.h
/* Copyright (c) 2008 the authors listed at the following URL, and/or
the authors of referenced articles or incorporated external code:
http://en.literateprograms.org/Binary_search_tree_(C_Plus_Plus)?action=history&offset=20080521005910
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Retrieved from: http://en.literateprograms.org/Binary_search_tree_(C_Plus_Plus)?oldid=13424
*/
#ifndef _BST_H_
#define _BST_H_
template <class T>
class BSTNode {
public:
BSTNode(T data);
T getData() { return data; }
private:
T data;
BSTNode<T>* left;
BSTNode<T>* right;
};
template <class T>
class BinarySearchTree {
public:
BSTNode<T>** search(T data);
void insert(T data);
void delete_node(BSTNode<T>** node);
private:
BSTNode<T>* root;
friend class BSTNode<T>;
};
#endif
