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DELORME Frederic
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 Posted: Mon Sep 27, 2004 10:16 am Post subject: Problem with a static member in a CNode class ... |
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I've the class CNode where there is a static member m_BaseNode:
The declaration file is : cnode.h
<code> -----------------------------------------------------------
#include <iostream>
#include <cstring>
#ifndef E3DCNODE_H
#define E3DCNODE_H
using namespace std;
namespace E3D {
/**
Noeud d'un arbre
@author DELORME Frederic
*/
class CNode{
public:
CNode();
CNode(string psNodeName);
CNode(string psNodeName, CNode *poParentNode);
~CNode();
void init();
void addChild(CNode *poNodeChild);
void attachTo(CNode *poNodeParent);
void remove(CNode *poNodeChild);
protected:
static CNode *m_BaseNode;
// Nom du noeud
string m_Name;
// Noeud Racine
// Parent de ce noeud
CNode *m_Parent;
// Premier Enfant de ce noeud
CNode *m_Child;
// Enfant suivant de ce noeud
CNode *m_Next;
// Enfant précédent de ce noeud
CNode *m_Prev;
};
};
#endif
----------------------------------------------------------- <code>
And the implemantation file is: cnode.cpp
<code> -----------------------------------------------------------
#include "cnode.h"
namespace E3D {
CNode::CNode(){
this->m_Name = "noname";
this->init();
}
/*!
Création d'un noeud attaché à un parent.
fn E3D::CNode::CNode(string *psNodeName)
param psNodeName : Nom du noeud à créer.
*/
CNode::CNode(string psNodeName)
{
this->m_Name = psNodeName;
this->init();
}
/*!
Création d'un noeud attaché à un parent.
fn E3D::CNode::CNode(CNode *poParentNode)
param poNodeName : Nom du noeud à créer.
param poParentNode : Noeud parent.
*/
CNode::CNode(string psNodeName, CNode *poParentNode)
{
this->m_Name = psNodeName;
poParentNode->addChild(this);
}
/*!
Constructeur par défaut
fn E3D::CNode::CNode().
*/
CNode::~CNode()
{
if(this->m_Child) delete this->m_Child;
if(this->m_Next) delete this->m_Next;
if(this->m_Prev) delete this->m_Prev;
}
void CNode::init(){
if(!this->m_BaseNode){
// oui, alors, on l'initialise
this->m_BaseNode = this;
this->m_Parent = NULL;
}else{
// Sinon on l'ajoute en tant qu'enfant.
this->m_BaseNode->addChild(this);
}
}
/*!
Ajout d'un enfant à cet objet.
fn E3D::CNode::addChild(const CNode *poNodeChild).
param poNodeChild : Noeud enfant à ajouter.
*/
void CNode::addChild(CNode *poNodeChild){
poNodeChild->attachTo(this);
/* // Ce noeud a-t-il des enfants ?
if( this->m_Child == NULL ){
// NON, alors on l'ajoute en tant que premier enfant
this->m_Child = poNodeChild;
poNodeChild->m_Parent = this;
}else{
// OUI, alors, on recherche le dernier enfant
CNode *ptrNode = this->m_Child;
while( ptrNode->m_Next != NULL ){
ptrNode = ptrNode->m_Next;
}
ptrNode->m_Next = poNodeChild;
poNodeChild->m_Prev = ptrNode;
}
*/
}
/*!
Attacher le Noeud courant au noeud parent donné.
fn E3D::CNode::attachTo(CNode *poNodeParent)
param poNodeParent : Parent auquel attacher le noeud.
*/
void CNode::attachTo(CNode *poNodeParent){
if( poNodeParent->m_Child == NULL ){
poNodeParent->m_Child = this;
}else{
CNode *ptrNode = poNodeParent->m_Child;
while( ptrNode->m_Next != NULL ){
ptrNode = ptrNode->m_Next;
}
ptrNode->m_Next = this;
}
}
/*!
Supprimer le noeud donné.
fn E3D::CNode::remove(CNode *poNode).
param poNode : Noeud à supprimer
*/
void CNode::remove(CNode *poNode){
// on récupère les précédents et suivants
if(poNode){
CNode *ptrNext = poNode->m_Next;
CNode *ptrPrev = poNode->m_Prev;
if( &poNode != &this->m_BaseNode ){
// On enlève le noeud de la chaine
if(ptrPrev!=NULL && ptrPrev->m_Next!=NULL) ptrPrev->m_Next = ptrNext;
if(ptrNext!=NULL && ptrNext->m_Prev!=NULL) ptrNext->m_Prev = ptrPrev;
delete poNode;
}else{
delete this;
}
}
}
};
----------------------------------------------------------- <code>
The problem is that i've the next error while compiling:
<log> ------------------------------------------------------------
| Quote: | */home/fred/Projets/cpp/testsdl/src/cnode.cpp:61: undefined reference to
`E3D::CNode::m_BaseNode'
*cnode.o(.text+0x50b):/home/fred/Projets/cpp/testsdl/src/cnode.cpp:63:
undefined reference to `E3D::CNode::m_BaseNode'
*cnode.o(.text+0x523):/home/fred/Projets/cpp/testsdl/src/cnode.cpp:67:
undefined reference to `E3D::CNode::m_BaseNode'
*/home/fred/Projets/cpp/testsdl/src/cnode.cpp:122: undefined reference to
`E3D::CNode::m_BaseNode' |
------------------------------------------------------------ <log>
anybody Any idea ?  )
thanks for any help !
F.Delorme.
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Ulrich Eckhardt
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| Posted: Mon Sep 27, 2004 9:07 pm Post subject: Re: Problem with a static member in a CNode class ... |
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DELORME Frederic wrote:
| Quote: | I've the class CNode where there is a static member m_BaseNode:
[...]
class CNode{
static CNode *m_BaseNode;
};
|
[snipped lots of other code]
| Quote: | The problem is that i've the next error while compiling:
*/home/fred/Projets/cpp/testsdl/src/cnode.cpp:61: undefined reference to
`E3D::CNode::m_BaseNode'
*cnode.o(.text+0x50b):/home/fred/Projets/cpp/testsdl/src/cnode.cpp:63:
undefined reference to `E3D::CNode::m_BaseNode'
|
Those are not compiler errors but linker errors. The problem is that you
declared the static element, but you never defined it. Add this line
CNode* CNode::m_BaseNode;
somewhere in your .cpp file.
BTW: please try reducing your problem to the smallest possible piece of code
that still shows the problem next time.
Uli
--
FAQ: http://parashift.com/c++-faq-lite/
/* bittersweet C++ */
default: break;
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Ben Hutchings
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| Posted: Mon Sep 27, 2004 9:22 pm Post subject: Re: Problem with a static member in a CNode class ... |
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DELORME Frederic wrote:
| Quote: | I've the class CNode where there is a static member m_BaseNode:
snip
The problem is that i've the next error while compiling:
log> ------------------------------------------------------------
*/home/fred/Projets/cpp/testsdl/src/cnode.cpp:61: undefined reference to
`E3D::CNode::m_BaseNode'
*cnode.o(.text+0x50b):/home/fred/Projets/cpp/testsdl/src/cnode.cpp:63:
undefined reference to `E3D::CNode::m_BaseNode'
*cnode.o(.text+0x523):/home/fred/Projets/cpp/testsdl/src/cnode.cpp:67:
undefined reference to `E3D::CNode::m_BaseNode'
*/home/fred/Projets/cpp/testsdl/src/cnode.cpp:122: undefined reference to
`E3D::CNode::m_BaseNode'
------------------------------------------------------------
snip |
You only declared CNode::m_BaseNode. Static members have to be
defined too (in exactly one translation unit). In this case you
should put "CNode * CNode::m_BaseNode;" in the implementation file.
--
Ben Hutchings
Absolutum obsoletum. (If it works, it's out of date.) - Stafford Beer
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