doubt in parent and child class

[iswaryasenthilkumar]

need to call parent method or variable in child class.
i created parent class (QWidget)
Widget.h

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include<QtGui>
#include"secdialog.h"  //child class
namespace Ui {
class Widget;
}
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
QPushButton *button1;
QString list;
private:
Ui::Widget *ui;
secDialog *sec; //creating object to child class
public slots:
void display();
}

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include<QtGui>
#include"secdialog.h"  //child class
namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT
    
public:
QPushButton *button1;
QString list;
private:
Ui::Widget *ui;
secDialog *sec; //creating object to child class
public slots:
void display();
}

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secDialog.h
child class (QDialog

#ifndef SECDIALOG_H
#define SECDIALOG_H
#include <QDialog>
#include<QWidget>
#include<QtGui>
#include"widget.h"//parent class
namespace Ui {
class secDialog;
}
 
class secDialog : public QDialog
{
    Q_OBJECT
 
public:
Private :
Widget *widget;//create object for parent class
public slots:
void newmethod();
}

#ifndef SECDIALOG_H
#define SECDIALOG_H
#include <QDialog>
#include<QWidget>
#include<QtGui>
#include"widget.h"//parent class
namespace Ui {
class secDialog;
}

class secDialog : public QDialog
{
    Q_OBJECT
    
public:
Private :
Widget *widget;//create object for parent class
public slots:
void newmethod();
}

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Widget.cpp

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
  button1=new QPushButton("CLICK",this);
  button1->show(); 
  connect(button1,SIGNAL(clicked()),this,SLOT(display());
    ui->setupUi(this);
}
void Widget::display()
{
sec=new secDialog(this);
sec->show();
}

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
  button1=new QPushButton("CLICK",this);
  button1->show(); 
  connect(button1,SIGNAL(clicked()),this,SLOT(display());
    ui->setupUi(this);
}
void Widget::display()
{
sec=new secDialog(this);
sec->show();
}

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secDialog.cpp

#include "secdialog.h"
#include "ui_secdialog.h"
secDialog::secDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::secDialog)
{
newmethod();
}
void secDialog::newmethod()
{
widget=new QWidget(this);
widget->list="Hello";
qDebug<<widget->list;
}

#include "secdialog.h"
#include "ui_secdialog.h"
secDialog::secDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::secDialog)
{
newmethod();
}
void secDialog::newmethod()
{
widget=new QWidget(this);
widget->list="Hello";
qDebug<<widget->list;
}

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When i execute this ,i getting Error,

"widget does not name a type"

"widget does not name a type"

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i need to use both class variables and button,i know somewhere am doing wrong can any one help to solve this problem,
Thanks in advance

[anda_skoa]

You have recursive includes, better use forward declarations in the headers to make each other type known and only include the other class' header in the source

widget.h

class secDialog; // instead of #include "secDialog.h"

class secDialog; // instead of #include "secDialog.h"

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widget.cpp

#include"secDialog.h" // include moved to the cpp file

#include"secDialog.h" // include moved to the cpp file

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secDialog.h

class Widget; // instead of #include "widget.h"

class Widget; // instead of #include "widget.h"

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secDialog.cpp

#include"widget.h" // include moved to the cpp file

#include"widget.h" // include moved to the cpp file

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Cheers,
_

[iswaryasenthilkumar]

Thanks it works anda_skoa

You have recursive includes, better use forward declarations in the headers to make each other type known and only include the other class' header in the source

widget.h

class secDialog; // instead of #include "secDialog.h"

class secDialog; // instead of #include "secDialog.h"

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widget.cpp

#include"secDialog.h" // include moved to the cpp file

#include"secDialog.h" // include moved to the cpp file

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secDialog.h

class Widget; // instead of #include "widget.h"

class Widget; // instead of #include "widget.h"

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secDialog.cpp

#include"widget.h" // include moved to the cpp file

#include"widget.h" // include moved to the cpp file

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Cheers,
_