• Announcements

Archived

This topic is now archived and is closed to further replies.

Template Help

Recommended Posts

i'm trying to develop a template for a linked list. This is the first template i've ever worked on... Here's the header for it:
struct LISTDATA_TYP
{
public:
LISTDATA_TYP();
~LISTDATA_TYP();
void *m_pData;
int m_nNodeID;
void* m_pNextNode;
void* m_pPrevNode;
};

{
public:
int InsertElementInList(void *pDataElement);
int DeleteElementInList(long nID);
T* FindNodeInList(long nSearchNodeID);

protected:
void RemoveNode(T* pDeleteNode);
long SetNewListElementID();
void DestroyList();

LISTDATA_TYP  ListData;
T *m_pTailNode;
long m_iListElementIndex;
};

And, in another file (called main.h):
LinkedListTemplate long LinkedList;

When i compile, i get the error:
main.obj : error LNK2001: unresolved external symbol "protected: void __thiscall LinkedListTemplate long ::DestroyList(void)" (?DestroyList@?$LinkedListTemplate@J@@IAEXXZ)  i couldn't get the arrow symbols surrounding class T to come through on this post, nor around long in the main.h file. But they are there. i also declare the functions in the source file like this: template class T T* LinkedListTemplate T ::FindNodeInList(long nSearchNodeID)  Again, the arrows around class T and T don't come through... i know what the error means, but i don't know how to fix it. i originally had the constructor and destructor in the body of the source file instead of the header, but i kept getting the above header for both, so i tried to simplify them in the header file. Any suggestions? Thanks! "You call him Dr. Grip, doll!" Edited by - the_grip on July 30, 2001 8:58:28 AM Share this post Link to post Share on other sites You need to explicitly instantiate the template class with long as the type... Stick this somewhere in your code..... template class LinkedListTemplate < long >; Edited by - Sandman on July 30, 2001 9:14:36 AM Share this post Link to post Share on other sites Ok, now my main.h header reads... //Main.h - main header file#ifndef __ONLY__DEFINE__ONCE__#include "LinkedList.h"template class LinkedListTemplate < long >;//////////CLASSESGameInterface *m_BlastBallGameInterface;GameUtility *m_BlastBallUtility;LinkedListTemplate < long > LinkedList;//////////PROTOTYPES//Functions//int LoadBitmapResourceorFile(LPDIRECTDRAWSURFACE7 lpdds, int iWidth, int iHeight, int xDest, int yDest, int nResID, char* sFileName);int InitializeGame();int InitializeDDraw7();int RunGameTurn();int ShutdownGame();int InitializeBall(struct BlastBall *pBall, LPDIRECTDRAWSURFACE7 lpddsBallSurface, int iInitAttributes=1);////////////////GLOBAL VARIABLES///////////////////VARIABLES HWND main_window_handle = NULL; HINSTANCE main_window_hinstance = NULL;//DirectX Stuff LPDIRECTDRAW7 lpdd7; DDSURFACEDESC2 ddsd; LPDIRECTDRAWSURFACE7 lpddsPrimary; LPDIRECTDRAWSURFACE7 lpddsBackBuffer; LPDIRECTDRAWSURFACE7 lpddsPaddle; LPDIRECTDRAWSURFACE7 lpddsBallOffscreen; LPDIRECTDRAWSURFACE7 lpddsBackground; LPDIRECTDRAWSURFACE7 lpddsTemp; LPDIRECTDRAWSURFACE7 lpddsBlocks; LPDIRECTDRAWCLIPPER lpddClipper; int m_iPaddleXPosition, m_iPaddleYPosition; int m_iXVelocityGen, m_iYVelocityGen;//Structures struct BlastBall { public: char* cBallFileName; int iMaxVelocity; int iMinVelocity; int iXVelocity; int iYVelocity; int iAngleOfMotion; int iXDirection; int iYDirection; int iXPoint, iYPoint; int iXPosition, iYPosition; bool bBallDeath; } *m_pBlastBall;//////////////////////////////////////////////////#define __ONLY__DEFINE__ONCE__#endif  But i get the following errors... d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''int __thiscall LinkedListTemplate < long > ::InsertElementInList(void *)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(24) : see declaration of ''InsertElementInList''d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''int __thiscall LinkedListTemplate < long > ::DeleteElementInList(long)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(25) : see declaration of ''DeleteElementInList''d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''long *__thiscall LinkedListTemplate < long > ::FindNodeInList(long)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(26) : see declaration of ''FindNodeInList''d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''int __thiscall LinkedListTemplate < long > ::AddNewNode(long *)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(29) : see declaration of ''AddNewNode''d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''void __thiscall LinkedListTemplate < long > ::RemoveNode(long *)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(30) : see declaration of ''RemoveNode''d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''long __thiscall LinkedListTemplate::SetNewListElementID(void)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(31) : see declaration of ''SetNewListElementID''d:\devl\personal\cpp\blastball\linkedlist.h(22) : warning C4661: ''void __thiscall LinkedListTemplate < long > ::DestroyList(void)'' : no suitable definition provided for explicit template instantiation request d:\devl\personal\cpp\blastball\linkedlist.h(32) : see declaration of ''DestroyList''Linking...main.obj : error LNK2001: unresolved external symbol "public: __thiscall LISTDATA_TYP::LISTDATA_TYP(void)" (??0LISTDATA_TYP@@QAE@XZ)main.obj : error LNK2001: unresolved external symbol "public: __thiscall LISTDATA_TYP::~LISTDATA_TYP(void)" (??1LISTDATA_TYP@@QAE@XZ)main.obj : error LNK2001: unresolved external symbol "protected: void __thiscall LinkedListTemplate::DestroyList(void)" (?DestroyList@?$LinkedListTemplate@J@@IAEXXZ)

Any more help is appreciated! Thanks - i''m new to the template stuff.

"You call him Dr. Grip, doll!"

Share on other sites
hmmmm. Whats in the cpp for the template?

If you cant get it to work, stick all the functions in the header. Thats usually the easiest way.

Share on other sites
Shouldn''t be all the template classes, including its actual function body, place in the include file instead of the usual .cpp/.h combo?

... just wondering...

Share on other sites
Yup, seems to work. Like i said, this is my first :D

Thanks for the help!

(p.s. the above code is broken anyway... i was writing it at 4 in the morning last night)

"You call him Dr. Grip, doll!"

Share on other sites
quote:

Shouldn''t be all the template classes, including its actual function body, place in the include file instead of the usual .cpp/.h combo?

... just wondering...

I dont think you have to, but it does make life easier...

• Forum Statistics

• Total Topics
627783
• Total Posts
2979035

• 11
• 10
• 10
• 23
• 9