invalid use of template name without an argument list

问题

I am facing a problem with my linked list class, I have created the interface and implementation files of the class, but when I build it, this error occurs: "invalid use of template name 'LinkedList' without an argument list". here's my interface file:

#ifndef LINKEDLIST_H
#define LINKEDLIST_H

template <typename T>
struct Node{
    T info;
    Node<T> *next;
};

template <typename T>
class LinkedList
{
    Node<T> *start;
    Node<T> *current;
public:
    LinkedList();
    ~LinkedList();
};

#endif // LINKEDLIST_H

and this is my implementation code:

#include "LinkedList.h"

LinkedList::LinkedList()
{
   start = nullptr;
   current = nullptr;
}

LinkedList::~LinkedList()
  {

  }

回答1:

Write it like this:

template<typename T>
LinkedList<T>::LinkedList()
{
   start = nullptr;
   current = nullptr;
}

And similarly for other member functions. But you'll run into another problem - declarations and definitions of a template can't be separated to different files.

来源：https://stackoverflow.com/questions/18186878/invalid-use-of-template-name-without-an-argument-list