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diff --git a/src/boost/libs/signals2/example/passing_slots.cpp b/src/boost/libs/signals2/example/passing_slots.cpp
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+++ b/src/boost/libs/signals2/example/passing_slots.cpp
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+// Example program showing passing of slots through an interface.
+//
+// Copyright Douglas Gregor 2001-2004.
+// Copyright Frank Mori Hess 2009.
+//
+// Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+// For more information, see http://www.boost.org
+
+#include <iostream>
+#include <boost/signals2/signal.hpp>
+
+//[ passing_slots_defs_code_snippet
+// a pretend GUI button
+class Button
+{
+  typedef boost::signals2::signal<void (int x, int y)> OnClick;
+public:
+  typedef OnClick::slot_type OnClickSlotType;
+  // forward slots through Button interface to its private signal
+  boost::signals2::connection doOnClick(const OnClickSlotType & slot);
+
+  // simulate user clicking on GUI button at coordinates 52, 38
+  void simulateClick();
+private:
+  OnClick onClick;
+};
+
+boost::signals2::connection Button::doOnClick(const OnClickSlotType & slot)
+{
+  return onClick.connect(slot);
+}
+
+void Button::simulateClick()
+{
+  onClick(52, 38);
+}
+
+void printCoordinates(long x, long y)
+{
+  std::cout << "(" << x << ", " << y << ")\n";
+}
+//]
+
+int main()
+{
+//[ passing_slots_usage_code_snippet
+  Button button;
+  button.doOnClick(&printCoordinates);
+  button.simulateClick();
+//]
+  return 0;
+}