Destructor not called

[satoshi]

Hi there,
I have a program in my C++ application, so I developed a simple example to explain the problem:

Main

#include <QtCore/QCoreApplication>
 
#include "myinterface.h"
#include "myconcreteclass.h"
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    MyInterface *myConcreteObject = new MyConcreteClass();
    myConcreteObject->doSomething();
 
    qDebug("Delete myConcreteObject");
    delete myConcreteObject;
 
    return a.exec();
}

#include <QtCore/QCoreApplication>

#include "myinterface.h"
#include "myconcreteclass.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    MyInterface *myConcreteObject = new MyConcreteClass();
    myConcreteObject->doSomething();

    qDebug("Delete myConcreteObject");
    delete myConcreteObject;

    return a.exec();
}

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MyInterface

#ifndef MYINTERFACE_H
#define MYINTERFACE_H
 
class MyInterface
{
    public:
        virtual void doSomething() = 0;
};
 
#endif // MYINTERFACE_H

#ifndef MYINTERFACE_H
#define MYINTERFACE_H

class MyInterface
{
    public:
        virtual void doSomething() = 0;
};

#endif // MYINTERFACE_H

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MyConcreteClass

// Header
#ifndef MYCONCRETECLASS_H
#define MYCONCRETECLASS_H
 
#include "myinterface.h"
 
class MyConcreteClass : public MyInterface
{
    public:
        MyConcreteClass();
        ~MyConcreteClass();
        void doSomething();
};
 
#endif // MYCONCRETECLASS_H
 
// Body
#include "myconcreteclass.h"
 
#include <QDebug>
 
MyConcreteClass::MyConcreteClass()
{
    qDebug("Concrete class constructor");
}
 
MyConcreteClass::~MyConcreteClass()
{
    qDebug("Concrete class destructor");
}
 
void MyConcreteClass::doSomething()
{
    qDebug("Do something");
}

// Header
#ifndef MYCONCRETECLASS_H
#define MYCONCRETECLASS_H

#include "myinterface.h"

class MyConcreteClass : public MyInterface
{
    public:
        MyConcreteClass();
        ~MyConcreteClass();
        void doSomething();
};

#endif // MYCONCRETECLASS_H

// Body
#include "myconcreteclass.h"

#include <QDebug>

MyConcreteClass::MyConcreteClass()
{
    qDebug("Concrete class constructor");
}

MyConcreteClass::~MyConcreteClass()
{
    qDebug("Concrete class destructor");
}

void MyConcreteClass::doSomething()
{
    qDebug("Do something");
}

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Output
Concrete class constructor
Do something
Delete myConcreteObject


... why the program didn't called the destructor of myConcreteClass?

Sorry for my english

Thanks, Dario

[csaken]

Hello,

Try to add a virtual destructor to your MyInterface class, like:

class MyInterface
{
public:
virtual void doSomething() = 0;
virtual ~MyInterface(){}
};

class MyInterface
{
public:
virtual void doSomething() = 0;
virtual ~MyInterface(){}
};

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Regards,
Jancsi Farkas

[satoshi]

Perfect, it works fine

Thanks! Dario