Home/ Questions/Is it okay to fix the argument list for class template is missing problem?
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Answered
William Murphy
  • 28
Asked: 2022-05-18T20:46:27+00:00 In:

Is it okay to fix the argument list for class template is missing problem?

  • 28

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Here is the program I run:

#pragma once
 
 template <typename ItemType>
 
 class LinkedArrayList 
 {
 
 private:
 
 class Node {
  ItemType* items;
  Node* next;
  Node* prev;
  int capacity;
  int size;
 };
 
 Node* head;
 Node* tail;
 int size;
 
 public:
 
 void insert (int index, const ItemType& item);
 ItemType remove (int index);
 int find (const ItemType& item);
 };
#include "LinkedArrayList.h"
 
 void LinkedArrayList::insert (int index, const ItemType& item)
 {}
 
 ItemType LinkedArrayList::remove (int index)
 {return ItemType();}
 
 int find (const ItemType& item)
 {return -1;}

After I run, it returns an error:

Argument list for class template 'LinkedArrayList' is missing

Does anyone have any suggestions for the problem below: argument list for class template is missing in the cpp – How to correct it?

argument list for class template is missing
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2 Answers

  1. Best Answer
    Expert

    The cause:

    You have got this error because you are trying to definite an out-of-line for a function declared in a  class of template that is not correct. And those definitions is being set in a .cpp file. Therefore, the error happens.

    Solution:

    Below is the way of providing a definition for a class template’s member functions:

    #contain "LinkedArrayList.h"

template<typename ItemType>
void LinkedArrayList<ItemType>::insert (int index, const ItemType& item)
{}

template<typename ItemType>
ItemType LinkedArrayList<ItemType>::remove (int index)
{return ItemType();}

template<typename ItemType>
int LinkedArrayList<ItemType>::find (const ItemType& item)
{return -1;}

    Because the compiler won’t be able to implicitly instantiate such definitions from their point of invocation, they cannot be included in a .cpp file.

    • 0

  2. If you use a template, mention it with your class. 

    #include "LinkedArrayList.h"
template<typename ItemType>

void LinkedArrayList<ItemType>::insert (int index, const ItemType& item)
{}
    • 11

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