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POError LNK2019 simple Linked List implementation
 

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  1. POError LNK2019 simple Linked List implementation
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    <p>I am implementing a simple Linked List, but I keep getting the LNK2019 error, I simplified my code to the minimum to track the problem,but I keep getting it. I am using Visual Studio 2010. My header file is:</p> <pre><code>#ifndef __TSLinkedList__H__ #define __TSLinkedList__H__ #if _MSC_VER &gt; 1000 #pragma once #endif // _MSC_VER &gt; 1000 #include "LinkedNode.h" template &lt;class T&gt; class LinkedList { public: LinkedList(void); ~LinkedList(void); protected: LinkedNode&lt;T&gt; * head; }; </code></pre> <p>The implementation file is:</p> <pre><code>#include "StdAfx.h" #include "LinkedList.h" template &lt;class T&gt; LinkedList&lt;T&gt;::LinkedList(void) { head = NULL; } template &lt;class T&gt; LinkedList&lt;T&gt;::~LinkedList(void) { } </code></pre> <p>the main function is:</p> <pre><code>#include "stdafx.h" #include "stdlib.h" #include "LinkedList.h" int _tmain(int argc, _TCHAR* argv[]) { LinkedList&lt;int&gt; mList; system("PAUSE"); return 0; } </code></pre> <p>and I am getting this error:</p> <p>Error 1 error LNK2019: símbolo externo "public: __thiscall LinkedList::~LinkedList(void)" (??1?$LinkedList@H@@QAE@XZ) in function _wmain </p> <p>I get the same error with the Constructor. The funny thing is that it is pointing to _wmain, and my main function is called _tmain. I already tried to change Subsystem linker from /SUBSYSTEM:WINODWS to /SUBSYSTEM:CONSOLE, but it was already set up as /SUBSYSTEM:CONSOLE. Obviously my implementation does a lot more than this, but I ripped out all of it to track this problem. Help wpuld be apreciated, this is driving me nuts. I am new to C++.</p>
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    1. USamaurs
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    1. COOK more question about this.. just move the implementation in the header file. Templates **cannot** be separated in header/source files.
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      1. USKiril Kirov
    2. COpossible duplicate of [Why can templates only be implemented in the header file?](http://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file)
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      1. POError LNK2019 simple Linked List implementation
      1. USMike Seymour
    3. COAlso, you shouldn't use [reserved names](http://stackoverflow.com/q/228783/204847) as include guards.
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      1. USMike Seymour
 

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