Message-ID:	<39BAE868.B8948FF7@operamail.com>
From:	Sahab Yazdani <sahaby AT operamail DOT com>
Organization:	PheonixSoft Inc.
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Newsgroups:	comp.os.msdos.djgpp
Subject:	template header files
Lines:	176
Date:	Sat, 09 Sep 2000 21:48:24 -0400
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To:	djgpp AT delorie DOT com
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This is a multi-part message in MIME format.
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hello i have written my own linked list template file and now want to
use it as a library (you know in different executables, etc). the
problem is that for every time that I write:

LinkedList<foo> bob;

the linker returns "undefined reference to LinkedList<foo>" and refuses
to actually compile the code.  i have included as attachment the header
file for the linked list, the actual code and a short sample program
using this library (which obviously doesn't work..)

thank you in advance for any help you may provide.

PS.  Sorry if this isn't a DJGPP specific question...
-- 
***********************************************************
* Sahab Yazdani * "Remember, I'm the monkey and you're the*
* Thornhill S.S * cheese grater. So no messing around."   *
***********************************************************
* http://pheonixsoft.virtualave.net/                      *
***********************************************************
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 name="test.cc"
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 filename="test.cc"

#include "linklist.h"

void main() {
	LinkedList<int> *test = new LinkedList<int>();

   test->Add( 50 );

   delete test;
}

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 name="linklist.h"
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 filename="linklist.h"

#ifndef LIST_H
#define LIST_H

template<class T>
class LinkedListObject {
	public:
		T object;
   	LinkedListObject<T> *next;
};

template<class T>
class LinkedList {
	private:
   	int entities;

   	LinkedListObject<T> *first;
	public:
   	LinkedList();
      ~LinkedList();

		void Add( T object );
      void Delete( int entity );

      T Get( int entity );
      void Set( int entity, T newValue );

      int GetEntities();
};

#endif

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#include <stdlib.h>

#include "linklist.h"

template<class T>
LinkedList<T>::LinkedList() {
	first=NULL;

   entities=0;
}

template<class T>
LinkedList<T>::~LinkedList() {
	LinkedListObject<T> *counter;
	LinkedListObject<T> *last;

   last = first;
	for ( counter=first->next;counter!=NULL;counter=counter->next)
   	delete last;
}

template<class T>
void LinkedList<T>::Add( T object ) {
	LinkedListObject<T> *newObject;

   newObject = new LinkedListObject<T>();
   newObject->object = object;
   newObject->next=first;

   first = newObject;

   entities++;
}

template<class T>
void LinkedList<T>::Delete( int entity ) {
   LinkedListObject<T> *spider;
   LinkedListObject<T> *last;
   int counter=0;

   spider=first;
   while (counter!=entity) {
   	last=spider;
   	spider=spider->next;
      counter++;
   }

	last->next = spider->next;
	entities--;

   delete spider;
}

template<class T>
T LinkedList<T>::Get( int entity ) {
   LinkedListObject<T> *spider;
   int counter=0;

   spider=first;
   while (counter!=entity) {
   	spider=spider->next;
      counter++;
   }

	return spider->object;
}

template<class T>
void LinkedList<T>::Set( int entity, T newValue ) {
	LinkedListObject<T> *spider;
   int counter=0;

   spider=first;
   while (counter!=entity) {
   	spider=spider->next;
      counter++;
   }

	spider->object = newValue;
}

template<class T>
int LinkedList<T>::GetEntities() {
	return entities;
}

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