Undefined reference error

[gabor53]

Hi,
I have this setItemDelegateForColumn line:

 QSqlTableModel* fixModel = new QSqlTableModel(this);
  fixModel->setTable ("Items");
  fixModel->setEditStrategy (QSqlTableModel::OnRowChange);
  fixModel->setSort (2, Qt::DescendingOrder);

  fixModel->select ();

  ui->tableView_Fix->setModel (fixModel);

  ui->tableView_Fix->setItemDelegateForColumn (4, new MaterialDelegate(this));
  ui->tableView_Fix->setItemDelegateForColumn(2, new FixViewDelegate(this));
  ui->tableView_Fix->setItemDelegateForColumn (3, new WhatFixViewDelegate(this));

Since I added MaterialDelegate I get this error:
undefined reference to `MaterialDelegate::MaterialDelegate(QObject)'*
I read it might be a bug, but how can I go around it and assign the delegate?

[mrjj]

@gabor53 said in Undefined reference error:

MaterialDelegate::MaterialDelegate(QObject)'

It says it dont have such constructor.

Show the class definition.

[gabor53]

@mrjj
materialdelegate.h:

#ifndef MATERIALDELEGATE_H
#define MATERIALDELEGATE_H

#include <QComboBox>
#include <QObject>
#include <QString>
#include <QSqlQuery>
#include <QStyledItemDelegate>
#include <QVBoxLayout>
#include <QWidget>

class MaterialDelegate : public QStyledItemDelegate {
  Q_OBJECT

 public:
  QSqlDatabase db;

  explicit MaterialDelegate(QObject* parent = Q_NULLPTR);

  QWidget*   createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const;
  void setEditorData(QWidget* editor, const QModelIndex& index) const;
  void updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const;
  void setModelData(QWidget* editor, QAbstractItemModel* fixModel, const QModelIndex& index) const;


 signals:

 public slots:
};

#endif // MATERIALDELEGATE_H

[mrjj]

Hi
seems fine.
Delete all files in your build folder and run qmake and rebuild all.

[gabor53]

@mrjj
Same error.

[m.sue]

Hi @gabor53

this is probably derived from a QObject * and you assume implicit conversion. But the explicit keyword in the MaterialDelegatecontructor does not allow for it: http://en.cppreference.com/w/cpp/language/explicit

-Michael.

[SGaist]

Hi,

Might be a silly question but did you implement that constructor ?

On a side note, there's not need for that db member variable.

[gabor53]

@SGaist
Hi,
Yes, implemented it.

[gabor53]

I completely deleted and recreated materialdelegate and now it work. Still don't know what was wrong with the previous file.