LNK2019未解析的外部符号＆＃34; public：void __thiscall List <int> :: push_front（int const＆amp;）＆＃34;在函数_main中引用

Question

全部，我正在实现LinkedList并遇到以下错误。据我搜索，以前没有问过这个问题。未解析的外部符号是什么意思？这是一个Win32控制台应用程序。任何帮助，将不胜感激。为代码格式提前道歉。我还没想到它。

LNK2019未解析的外部符号＆＃34; public：void __thiscall List :: push_front（int const＆amp;）＆＃34; （？push_front @？$ List @ H @@ QAEXABH @ Z）在函数_main

中引用

List.cpp

 


#include "stdafx.h"
#include "List.h"
#include "Node.h"

template <typename Type>
List<Type>::List()
{
    head = NULL;
    tail = NULL;
    count = 0;
}

template <typename Type>
List<Type>::~List()
{
}

template <typename Type>
bool List<Type>::empty()
{
    return count == 0;
}

template <typename Type>
int List<Type>::size()
{
    return count;
}

template <typename Type>
void List<Type>::push_front(const Type &d)
{
    Node *new_head = new Node(d, NULL, head);

    if (this->empty())
    {
        head = new_head;
        tail = new_head;
    }
    else
    {
        head->prev = new_head;
        head = new_head;
    }

    count++;
}

template <typename Type>
void List<Type>::push_back(const Type &d)
{
    Node *new_tail = new Node(d, NULL, tail);

    if (this->empty())
    {
        head = new_tail;
        tail = new_tail;
    }
    else
    {
        tail->next = new_tail;
        tail = new_tail;
    }

    count++;
}

template <typename Type>
void List<Type>::DisplayContents()
{
    Node *current = head;
    for (int i = 0; i <= this->size; i++)
    {
        cout << current->data << " ";
        current = current->next;
    }
}
</pre></code>


LinkedList.cpp
 

#include "stdafx.h"
#include "List.h"


int main()
{
    List<int> listIntegers;

    listIntegers.push_front(10);
    listIntegers.push_front(2011);
    listIntegers.push_back(-1);
    listIntegers.push_back(9999);

    listIntegers.DisplayContents();
    return 0;
}