Problem with "undefined reference to 'vtable for myclass' "

[jefazo92]

Hi everyone,

I've been trying to link 2 files but I'm getting the error "undefined reference to 'vtable for myclass' ". One cpp contains my QMainWindow whereas my the other one contains my binary tree.
The idea is that using SIGNALS and SLOTS I can use the application window to store the values into my tree.
The application was running before but for some reason once I linked both headers and files, it stopped working.
I'm getting errors in the constructors and destructors of my trees.
I'm getting the error " Undefined reference to "vtable for Tree" ".
Any help in solving this issue would be appreciated. Thanks.

#ifndef DICTIONARY_H
#define DICTIONARY_H

#include <QMainWindow>
#include <QCloseEvent>
#include <tree.h>


using namespace std;

namespace Ui {
class Dictionary;
}

class Dictionary : public QMainWindow
{
    Q_OBJECT

public:
    explicit Dictionary(QWidget *parent = 0);
    ~Dictionary();
    Tree *t;
    


private:
    Ui::Dictionary *ui;


private slots:

};

#endif // DICTIONARY_H



--------------------------- GUI Dictionary cpp file


#include "dictionary.h"
#include "ui_dictionary.h"
#include <QFile>
#include <QFileDialog>
#include <QTextStream>
#include <QMessageBox>
#include <QtGlobal>

using namespace std;

Dictionary::Dictionary(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Dictionary)
{
    ui->setupUi(this);
     t = new Tree(this);
    connect(ui->actionO_pen, SIGNAL(triggered()), this, SLOT(fileOpen()));
    connect(ui->actionE_xit, SIGNAL(triggered()), this, SLOT(close()));
    connect(ui->keyboardword, SIGNAL(triggered()), t, SLOT(add(NodePtr&,QString)));
    connect(ui->actionA_scending_order, SIGNAL(triggered()), t, SLOT(disp_inord(NodePtr)));
    connect(ui->actionD_escending_order, SIGNAL(triggered()), t, SLOT(disp_inreverse(NodePtr)));

}

void Dictionary::fileOpen()
{
   }
        

void Dictionary::closeEvent(QCloseEvent *event)
{
    
}

bool Dictionary::canClose()
 {


}

Dictionary::~Dictionary()
{
    delete ui;
}




------------------------------TREE header file

#ifndef TREE_H
#define TREE_H

#include <QMainWindow>
#include <QObject>
#include <QWidget>

using namespace std;

struct tree_node { //Create Node "template".
    tree_node *left;   // left subtree has smaller elements
    tree_node *right;  // right subtree has larger elements
    QString word; // This tree stores int values
    unsigned int count = 0; //Count for duplicates.
};

typedef tree_node* NodePtr;

class Tree : public QObject 
{
    Q_OBJECT 
private:
    NodePtr fRoot; //Create Root of Binary Tree
    int size;


public:
    explicit Tree(QObject *parent = 0); 
    ~Tree();
    NodePtr &getRoot() { return fRoot; } 
    void removeNode (NodePtr &ptr);


public slots:
    void addverbose(NodePtr &ptr, QString aword);
    void addsilent(NodePtr &ptr, QString aword);
    void disp_inord(NodePtr ptr);
    void disp_inreverse(NodePtr ptr);
  
    

};

#endif // TREE_H




-------------------------------------------------Tree cpp file

#include "tree.h"
#include <iostream>
#include <QString>

using namespace std;

Tree::Tree(QObject *parent) : QObject(parent)
{
    fRoot = NULL; // Initialize pointer (make root node to point to Null).
  
}

Tree::~Tree()
{
  removeNode(fRoot);
}

void Tree::disp_inord(NodePtr ptr) //Display contents of dictionary
{
    if (ptr != NULL)
    {
        disp_inord(ptr->left);       // print left subtree
        std::cout << qPrintable(ptr->word) << '\n';    // print this node
        disp_inord(ptr->right);      // print right subtree
    }
}

void Tree::disp_inreverse(NodePtr ptr) //Display contents of dictionary in reverse order
{
    if (ptr != NULL)
    {
        disp_inreverse(ptr->right);       // print right subtree
        std::cout << qPrintable(ptr->word) << '\n';    // print this node
        disp_inreverse(ptr->left);      // print left subtree
    }
}


/*auto new_end = std::remove_if(s.begin(), s.end(), [](QChar c) { return c.isPunct(); });
s.resize(new_end - s.begin());  CODE TO REMOVE CHARACTERS WHICH AREN'T LETTERS OR NUMBERS.*/






void Tree::addverbose(NodePtr &ptr, QString aword){  //Why ptr passed as a reference here ????????????????????????????????????????


    
}

void Tree::addsilent(NodePtr &ptr, QString aword){  //Why ptr passed as a reference here ????????????????????????????????????????


 
    }





void Tree::removeNode(NodePtr &ptr){
    if(ptr != NULL)
    {

            removeNode (ptr->left);

            removeNode (ptr->right);

        delete ptr;

    }
}

[ne555]

> "undefined reference to 'vtable for myclass' ".
I don't see any `myclass' in the code that you've posted.
irrc, the error means that you are missing a definition of a non-pure virtual function (it is defined in the child, but not no the base)
sadly, it does not say which function is missing the definition.


ps: ¿why there is no color in the code? ¿or is it just me?

[Enoizat]

Have you already tried this?
Edit --> Clean All (or, at least, Clean project "your project name")
< wait untill finished!! >
Edit --> Run qmake
< wait untill finished!! >
Rebuild

- - -

ne555 wrote:

¿or is it just me?

In that case we would suffer from the same type of color blindness :)
I think the OP’s used [ output] instead of [ code].

[keskiverto]

Your build does run the moc too?