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#include <QAbstractButton>

#include "signalsandslots.h"

//! [0]

void Counter::setValue(int value)

{

    if (value != m_value) {

        m_value = value;

        emit valueChanged(value);

    }

}

//! [0]

int main()

{

//! [1]

    Counter a, b;

//! [1] //! [2]

    QObject::connect(&a, SIGNAL(valueChanged(int)),

                     &b, SLOT(setValue(int)));

//! [2]

//! [3]

    a.setValue(12);     // a.value() == 12, b.value() == 12

//! [3] //! [4]

    b.setValue(48);     // a.value() == 12, b.value() == 48

//! [4]

    QWidget *widget = reinterpret_cast<QWidget *>(new QObject(0));

//! [5]

    if (widget->inherits("QAbstractButton")) {

        QAbstractButton *button = static_cast<QAbstractButton *>(widget);

        button->toggle();

//! [5] //! [6]

    }

//! [6]

//! [7]

    if (QAbstractButton *button = qobject_cast<QAbstractButton *>(widget))

        button->toggle();

//! [7]

}