text: /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the test suite of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL21$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see http://www.qt.io/terms-conditions. For further
  ** information use the contact form at http://www.qt.io/contact-us.
  **
  ** GNU Lesser General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 2.1 or version 3 as published by the Free
  ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
  ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
  ** following information to ensure the GNU Lesser General Public License
  ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
  ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  **
  ** As a special exception, The Qt Company gives you certain additional
  ** rights. These rights are described in The Qt Company LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #include "signalbug.h"
  
  #include <qcoreapplication.h>
  #include <qstring.h>
  
  #include <stdio.h>
  
  static int Step = 0;
  Sender RandomSender (0, 0);
  
  void TRACE (int step, const char *name)
  {
      for (int t = 0; t < step - 1; t++)
          fprintf (stderr, "\t");
      fprintf (stderr, "Step %d: %s\n", step, name);
      return;
  }
  
  Receiver::Receiver ()
      : QObject ()
  {
  }
  
  void Receiver::received ()
  {
      ::Step++;
      const int stepCopy = ::Step;
      TRACE (stepCopy, "Receiver::received()");
      if (::Step != 2 && ::Step != 4)
          qFatal("%s: Incorrect Step: %d (should be 2 or 4)", Q_FUNC_INFO, ::Step);
  
      if (::Step == 2)
          s->fire ();
  
      fprintf (stderr, "Receiver<%s>::received() sender=%s\n",
          (const char *) objectName ().toLatin1 (), sender ()->metaObject()->className());
  
      TRACE (stepCopy, "ends Receiver::received()");
  }
  
  Disconnector::Disconnector ()
      : QObject ()
  {
  }
  
  void Disconnector::received ()
  {
      ::Step++;
      const int stepCopy = ::Step;
      TRACE (stepCopy, "Disconnector::received()");
      if (::Step != 5 && ::Step != 6)
          qFatal("%s: Incorrect Step: %d (should be 5 or 6)", Q_FUNC_INFO, ::Step);
  
      fprintf (stderr, "Disconnector<%s>::received() sender=%s\n",
          (const char *) objectName ().toLatin1 (), sender ()->metaObject()->className());
      if (sender () == 0)
          fprintf (stderr, "WE SHOULD NOT BE RECEIVING THIS SIGNAL\n");
  
      if (::Step == 5)
      {
          disconnect (s, SIGNAL(fired()), s->d, SLOT(received()));
  
          connect (&RandomSender, SIGNAL(fired()), s->d, SLOT(received()));
      }
  
      TRACE (stepCopy, "ends Disconnector::received()");
  }
  
  
  Sender::Sender (Receiver *r, Disconnector *d)
      : QObject ()
  {
      this->r = r; this->d = d;
      if (r)
          connect (this, SIGNAL(fired()), r, SLOT(received()));
      if (d)
          connect (this, SIGNAL(fired()), d, SLOT(received()));
  };
  
  void Sender::fire ()
  {
      ::Step++;
      const int stepCopy = ::Step;
      TRACE (stepCopy, "Sender::fire()");
      if (::Step != 1 && ::Step != 3)
          qFatal("%s: Incorrect Step: %d (should be 1 or 3)", Q_FUNC_INFO, ::Step);
  
      emit fired ();
      TRACE (stepCopy, "ends Sender::fire()");
  }
  
  int main (int argc, char *argv [])
  {
      QCoreApplication app (argc, argv);
  
      Receiver r;
      Disconnector d;
      Sender s (&r, &d);
  
      r.s = &s;
      d.s = &s;
  
      ::Step = 0;
      s.fire ();
      return 0;
  }
  