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diff --git a/src/boost/libs/signals2/example/doc_view.cpp b/src/boost/libs/signals2/example/doc_view.cpp
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+++ b/src/boost/libs/signals2/example/doc_view.cpp
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+// Document/View sample for Boost.Signals
+// Copyright Keith MacDonald 2005.
+// 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 <string>
+#include <boost/signals2/signal.hpp>
+#include <boost/bind/bind.hpp> 
+
+//[ document_def_code_snippet
+class Document
+{
+public:
+    typedef boost::signals2::signal<void ()>  signal_t;
+
+public:
+    Document()
+    {}
+
+    /* Connect a slot to the signal which will be emitted whenever
+      text is appended to the document. */
+    boost::signals2::connection connect(const signal_t::slot_type &subscriber)
+    {
+        return m_sig.connect(subscriber);
+    }
+
+    void append(const char* s)
+    {
+        m_text += s;
+        m_sig();
+    }
+
+    const std::string& getText() const
+    {
+        return m_text;
+    }
+
+private:
+    signal_t    m_sig;
+    std::string m_text;
+};
+//]
+
+//[ text_view_def_code_snippet
+class TextView
+{
+public:
+    TextView(Document& doc): m_document(doc)
+    {
+        m_connection = m_document.connect(boost::bind(&TextView::refresh, this));
+    }
+
+    ~TextView()
+    {
+        m_connection.disconnect();
+    }
+
+    void refresh() const
+    {
+        std::cout << "TextView: " << m_document.getText() << std::endl;
+    }
+private:
+    Document&               m_document;
+    boost::signals2::connection  m_connection;
+};
+//]
+
+//[ hex_view_def_code_snippet
+class HexView
+{
+public:
+    HexView(Document& doc): m_document(doc)
+    {
+        m_connection = m_document.connect(boost::bind(&HexView::refresh, this));
+    }
+
+    ~HexView()
+    {
+        m_connection.disconnect();
+    }
+
+    void refresh() const
+    {
+        const std::string&  s = m_document.getText();
+
+        std::cout << "HexView:";
+
+        for (std::string::const_iterator it = s.begin(); it != s.end(); ++it)
+            std::cout << ' ' << std::hex << static_cast<int>(*it);
+
+        std::cout << std::endl;
+    }
+private:
+    Document&               m_document;
+    boost::signals2::connection  m_connection;
+};
+//]
+
+//[ document_view_main_code_snippet
+int main(int argc, char* argv[])
+{
+    Document    doc;
+    TextView    v1(doc);
+    HexView     v2(doc);
+
+    doc.append(argc == 2 ? argv[1] : "Hello world!");
+    return 0;
+}
+//]