“列表”不是模板

Question

Does anyone have any insight in to how this error occurs? I made a LinkedList a template in C++ and in my main method I have this code:

List<int> list;
list.insert(1, 9);

And I am getting this error on the first line:

`List' is not a template

I am including this file:

template <typename T>
class List
{
public:
       List();
       List(const List& aList);
       ~List();

       bool isEmpty() const;
       int getLength() const;
       void insert(int index, const T& newItem);
       void remove(int index);
       void retrieve(int index, T& dataItem) const;

private:
        struct ListNode
        {
               T item;
               ListNode *next;
        };

        int size;
        ListNode *head;

        ListNode *find(int index) const;
};

Not posting the implementation file for spacial reasons but I am post individual functions if necessary.

I tried changing List(const List& aList); to List(const List<T>& aList); but that didn't really change anything. Templating syntax confuses me >.<

Answer 1

In my projects I declare list like this to avoid the error

    using namespace std;
    #include <list>

Answer 2

Are you sure that your List template class is not in a different namespace?

Have you tried renaming your template class to something unique to ensure you are instantiating the class you think you are?

Answer 3

Is it possible that you wrote the template code in the .cpp file?

I'm going of by this line:

Not posting the implementation file

Template code can only ever be in the .h file, there can be no "implementation file".
The reasons are as complicated, as they are silly :)