어쩌다가...휴식중..休

a.h

#ifndef A_H

#define A_H

#include <QtGlobal>

#include <QObject>

class A : public QObject

{

Q_OBJECT

public:

A(QObject* parent = NULL);

};

#endif // A_H

a.cpp

#include "a.h"

A::A(QObject* parent)

: QObject(parent)

{

}

b.h

#ifndef B_H

#define B_H

#include <QtGlobal>

#include <QObject>

#include "A.h"

class B : public A

{

Q_OBJECT

public:

B(QObject* parent = NULL);

};

#endif // B_H

b.cpp

#include "b.h"

B::B(QObject* parent)

: A(parent)

{

}

main.cpp

#include <cstdio>

#include <string>

#include <QtCore/QCoreApplication>

#include <QDebug>

#include "a.h"

#include "b.h"

int main(int argc, char *argv[])

{

QCoreApplication a(argc, argv);

QObject *obj = new B; // polymorphism in object-oriented programming

qDebug() << QString( obj->metaObject()->className() ); // print "B"

return 0;

}