diff -r ac4f18445e75 -r 76cd1fcea02d src/common/ui-variable-tracer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/common/ui-variable-tracer.h	Mon Sep 04 15:09:58 2006 +0200
@@ -0,0 +1,239 @@
+/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
+/*
+ * Copyright (c) 2006 INRIA
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+
+#ifndef UI_VARIABLE_TRACER_H
+#define UI_VARIABLE_TRACER_H
+
+#include "ns3/callback.h"
+#include <stdint.h>
+
+namespace ns3 {
+
+class UiVariableTracerBase {
+public:
+	typedef Callback<void, uint64_t, uint64_t> ChangeNotifyCallback;
+
+	UiVariableTracerBase ()
+		: m_callback () {}
+	/* We don't want to copy the base callback. Only set_callback on
+	 * a specific instance will do something to it. */
+	UiVariableTracerBase (UiVariableTracerBase const &o) 
+		: m_callback () {}
+	UiVariableTracerBase &operator = (UiVariableTracerBase const &o) {
+		return *this;
+	}
+	~UiVariableTracerBase () {}
+
+	void set_callback(ChangeNotifyCallback callback) {
+		m_callback = callback;
+	}
+protected:
+	void notify (uint64_t old_val, uint64_t new_val) {
+		if (old_val != new_val && !m_callback.is_null ()) {
+			m_callback (old_val, new_val);
+		}
+	}
+private:
+	ChangeNotifyCallback m_callback;
+};
+
+template <typename T>
+class SiVariableTracer;
+
+
+/**
+ * \brief trace variables of type "unsigned integer"
+ *
+ * This template class implements a POD type: it
+ * behaves like any other variable of type "unsigned integer"
+ * except that it also reports any changes to its
+ * value with its internal callback.
+ *
+ * To instantiate a 32-bit unsigned variable (to store
+ * a TCP counter for example), you would create a variable of type
+ * ns3::UiVariableTracer<uint32_t> :
+ \code
+ #include <stdint.h>
+ #include "ns3/ui-traced-variable.tcc"
+
+ ns3::UiVariableTracer<uint32_t> var;
+ \endcode
+ * and you would use it like any other variable of type uint32_t:
+ \code
+ var += 12;
+ var = 10;
+ \endcode
+ */
+template <typename T>
+class UiVariableTracer : public UiVariableTracerBase {
+public:
+	UiVariableTracer ()
+		: m_var ()
+	{}
+	UiVariableTracer (T const &var) 
+		: m_var (var)
+	{}
+
+	UiVariableTracer &operator = (UiVariableTracer const &o) {
+		assign (o.get ());
+		return *this;
+	}
+	template <typename TT>
+	UiVariableTracer &operator = (UiVariableTracer<TT> const &o) {
+		assign (o.get ());
+		return *this;
+	}
+	template <typename TT>
+	UiVariableTracer &operator = (SiVariableTracer<TT> const &o) {
+		assign (o.get ());
+		return *this;
+	}
+	UiVariableTracer &operator++ () {
+		assign (get () + 1);
+		return *this;
+	}
+	UiVariableTracer &operator-- () {
+		assign (get () - 1);
+		return *this;
+	}
+	UiVariableTracer operator++ (int) {
+		UiVariableTracer old (*this);
+		++*this;
+		return old;
+	}
+	UiVariableTracer operator-- (int) {
+		UiVariableTracer old (*this);
+		--*this;
+		return old;
+	}
+	operator T () const {
+		return get ();
+	}
+
+
+	void assign (T var) {
+		notify (m_var, var);
+		m_var = var;
+	}
+        T get (void) const {
+		return m_var;
+	}
+
+private:
+	T m_var;
+};
+
+template <typename T>
+UiVariableTracer<T> &operator += (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () + rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator -= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () - rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator *= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () * rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator /= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () / rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator <<= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () << rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator >>= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () >> rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator &= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () & rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator |= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () | rhs.get ());
+	return lhs;
+}
+template <typename T>
+UiVariableTracer<T> &operator ^= (UiVariableTracer<T> &lhs, UiVariableTracer<T> const &rhs) {
+	lhs.assign (lhs.get () ^ rhs.get ());
+	return lhs;
+}
+
+
+template <typename T, typename U>
+UiVariableTracer<T> &operator += (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () + rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator -= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () - rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator *= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () * rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator /= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () / rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator <<= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () << rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator >>= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () >> rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator &= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () & rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator |= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () | rhs);
+	return lhs;
+}
+template <typename T, typename U>
+UiVariableTracer<T> &operator ^= (UiVariableTracer<T> &lhs, U const &rhs) {
+	lhs.assign (lhs.get () ^ rhs);
+	return lhs;
+}
+
+}; // namespace ns3
+
+#endif /* UI_VARIABLE_TRACER_H */