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This is the verbatim text of the qsignal.h include file. It is provided only for illustration; the copyright remains with Trolltech.
** $Id: //depot/qt/main/src/kernel/qsignal.h#20 $
** Definition of QSignal class
** Created : 941201
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
** This file is part of the kernel module of the Qt GUI Toolkit.
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** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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#ifndef QSIGNAL_H
#define QSIGNAL_H

#ifndef QT_H
#include "qobject.h"
#endif // QT_H

class Q_EXPORT QSignal : private QObject                        // signal class
    QSignal( QObject *parent=0, const char *name=0 );

    const char *name() const            { return QObject::name(); }
    void    setName( const char *name ) { QObject::setName(name); }

    bool    connect( const QObject *receiver, const char *member );
    bool    disconnect( const QObject *receiver, const char *member=0 );

    bool    isBlocked()  const          { return QObject::signalsBlocked(); }
    void    block( bool b )             { QObject::blockSignals( b ); }

    void    activate();

    void     setParameter( int value );
    int     parameter() const;

    void    dummy(int);
/* tmake ignore Q_OBJECT */

private:        // Disabled copy constructor and operator=
#if defined(Q_DISABLE_COPY)
    QSignal( const QSignal & );
    QSignal &operator=( const QSignal & );

#endif // QSIGNAL_H

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Qt version 2.3.10