inheritance problem

[amina]

Hello,

I want to create a super class Capteur_ that is a QObject class, and I will create sub classes but I had errors , I tried also to make a multiple inheritance for the sub class (Caplteur_ and QObject) but didn't work

so this is my Capteur_.h

#ifndef CAPTEUR__H
#define CAPTEUR__H

#include <QObject>
#include<QTimer>

class Capteur_ : public QObject
{
    Q_OBJECT
public:
    explicit Capteur_(int pin,QObject *parent = nullptr);
protected:
    int m_pin;
    int m_value;
    int m_typeIO;
    int readPin();
    QTimer *m_timer;
signals:
protected slots:
    void onTimeout();
public slots:
};

#endif // CAPTEUR__H

this is my Capteur_.cpp

#include "capteur_.h"

Capteur_::Capteur_(int pin,QObject *parent) : QObject(parent)
{
    m_pin=pin;
   }

this is my Capteur_Output.h

#ifndef CAPTEUR_OUTPUT_H
#define CAPTEUR_OUTPUT_H
#include"capteur_.h"

class Capteur_Output:  public QObject , public Capteur_
{  Q_OBJECT
public:
     Capteur_Output(int pin,QObject *parent = nullptr);
 };

#endif // CAPTEUR_OUTPUT_H

and this is my Capteur_Output.cpp

#include "capteur_output.h"


Capteur_Output::Capteur_Output(int pin,QObject *parent):QObject(parent)
{
    m_pin=pin;
}

I tried also to make my `Capteur_Output` class inherits only from `Capteur_` since `Capteur_` is a `QObject` class but didnt work also .. can someone please help me fixing this please

[KroMignon]

@amina said in inheritance problem:

and if I add the other argument
class Capteur_Output: public Capteur_
{
public:
Capteur_Output(int pin,QObject *parent = nullptr);//,QObject *parent = nullptr

};
***********Capteur_Output.cpp

Capteur_Output::Capteur_Output(int pin,QObject *parent):Capteur_(parent)//,QObject *parent
{
m_pin=pin;
}

I have 2 remarks:

• first, you should also add Q_OBJECT in Capteur_Output, because it is sub-classing a QObject based class
• second, as far as I can see, Capteur_ constructor as 2 parameters: int and QObject*

==> Capteur_Output::Capteur_Output(int pin,QObject *parent):Capteur_(pin,parent) {} should do the job ;)

[sierdzio]

QObject classes cannot be mixed in multiple inheritance.

But your other attempt should work:

I tried also to make my Capteur_Output class inherits only from Capteur_ since Capteur_ is a QObject class but didnt work also ..

Can you show the code for this approach? What were error messages, how did it fail to work?

[amina]

@sierdzio thank you for explaining, but it didn't also work I don't know if I am doing something wrong

I just changed the Capteur_Output.h

class Capteur_Output:  public Capteur_
{
public:
     Capteur_Output(int pin);//,QObject *parent = nullptr

};

and the .cpp

Capteur_Output::Capteur_Output(int pin)//,QObject *parent
{
    m_pin=pin;
}

and this is the error that I got

and if I add the other argument

class Capteur_Output:  public Capteur_
{
public:
     Capteur_Output(int pin,QObject *parent = nullptr);//,QObject *parent = nullptr

};
***********Capteur_Output.cpp

Capteur_Output::Capteur_Output(int pin,QObject *parent):Capteur_(parent)//,QObject *parent
{
    m_pin=pin;
}

it gives this error

[KroMignon]

@amina said in inheritance problem:

and if I add the other argument
class Capteur_Output: public Capteur_
{
public:
Capteur_Output(int pin,QObject *parent = nullptr);//,QObject *parent = nullptr

};
***********Capteur_Output.cpp

Capteur_Output::Capteur_Output(int pin,QObject *parent):Capteur_(parent)//,QObject *parent
{
m_pin=pin;
}

I have 2 remarks:

• first, you should also add Q_OBJECT in Capteur_Output, because it is sub-classing a QObject based class
• second, as far as I can see, Capteur_ constructor as 2 parameters: int and QObject*

==> Capteur_Output::Capteur_Output(int pin,QObject *parent):Capteur_(pin,parent) {} should do the job ;)

[J.Hilk]

@amina to add to @KroMignon ,

From the compiler output, you're trying to call the default constructor of your class somewhere, and it doesn't exist, because pin has no default value

[amina]

@KroMignon thank you it is working now

[amina]

@J-Hilk said in inheritance problem:

default value

thank you for explaining

[Pablo J. Rogina]

@amina said in inheritance problem:

it is working now

great, so don't forget to mark your post as solved!