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#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()");

	Q_ASSERT (::Step == 2 || ::Step == 4);

	if (::Step == 2)

		s->fire ();

	fprintf (stderr, "Receiver<%s>::received() sender=%s\n",

		(const char *) objectName ().toAscii (), sender ()->metaObject()->className());

	TRACE (stepCopy, "ends Receiver::received()");

}

Disconnector::Disconnector ()

	: QObject ()

{

}

void Disconnector::received ()

{

	::Step++;

	const int stepCopy = ::Step;

	TRACE (stepCopy, "Disconnector::received()");

	Q_ASSERT (::Step == 5 || ::Step == 6);

	fprintf (stderr, "Disconnector<%s>::received() sender=%s\n",

		(const char *) objectName ().toAscii (), 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()");

	Q_ASSERT (::Step == 1 || ::Step == 3);

	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;

}