模板错误:未定义参考 [英] Template error : undefined reference

问题描述

我正在尝试使用模板创建一个类linkedList，但是当我对其进行编译时，IDE给出了一个错误:未定义对`listType :: add(int)的引用我不明白为什么?

I am trying to create a class linkedList using template but when I compile it the IDE gives an error : undefined reference to `listType::add(int) I am not understanding why ?

linkedList.h

linkedList.h

#ifndef LINKEDLISTS_H_INCLUDED
#define LINKEDLISTS_H_INCLUDED
#include "struct.h"
template <class type1>

class listType
{
public:

void add(type1);
void print();
private:
node<type1> *head;
};


#endif // LINKEDLISTS_H_INCLUDED

---

LinkedList.cpp

---

LinkedList.cpp

#include "linkedLists.h"
#include "struct.h"
#include <iostream>
using namespace std;

template <class type1>
void listType<type1>::add(type1 temp)
{
node<type1> *t;
t->value=temp;
t->link=head;
head=t;
}
template <class type1>
void listType<type1>::print()
{
node<type1> *p;
p=head;
while(p!=NULL)
{

    cout<<p->value<<endl;
    p=p->link;
}

}

---

Struct.h

---

Struct.h

#ifndef STRUCT_H_INCLUDED
#define STRUCT_H_INCLUDED
template <class type1>

struct node
{

type1 value;
node *link;
};


#endif // STRUCT_H_INCLUDED

---

main.cpp

---

main.cpp

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


int main()
{
listType <int> test;
test.add(5);

}

---

推荐答案

您无法在cpp文件中实现模板化类和函数的实现.

You can't have the implementation of templated classes and functions in the cpp file.

代码必须在标头中，这样包含文件才能看到实现，并使用其模板参数类型实例化正确的版本.

The code has to be in the header, so the including files can see the implementation, and instantiate the correct version with their template argument type.

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