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diff --git a/doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp b/doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp
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+++ b/doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp
@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+// all 5 strings share the same data
+QString s1 = "abcd";
+QString s2 = s1;
+QString s3 = s2;
+QString s4 = s3;
+QString s5 = s2;
+//! [0]
+
+
+//! [1]
+// s1, s2 and s5 share the same data, neither s3 nor s4 are shared
+QString s1 = "abcd";
+QString s2 = s1;
+Q3DeepCopy<QString> s3 = s2;  // s3 is a deep copy of s2
+QString s4 = s3;             // s4 is a deep copy of s3
+QString s5 = s2;
+//! [1]
+
+
+//! [2]
+// s1, s2 and s5 share the same data, s3 and s4 share the same data
+QString s1 = "abcd";
+QString s2 = s1;
+QString s3 = Q3DeepCopy<QString>( s2 );  // s3 is a deep copy of s2
+QString s4 = s3;                        // s4 is a shallow copy of s3
+QString s5 = s2;
+//! [2]
+
+
+//! [3]
+Q3DeepCopy<QString> global_string;  // global string data
+QMutex global_mutex;               // mutex to protext global_string
+
+...
+
+void setGlobalString( const QString &str )
+{
+    global_mutex.lock();
+    global_string = str;           // global_string is a deep copy of str
+    global_mutex.unlock();
+}
+
+...
+
+void MyThread::run()
+{
+    global_mutex.lock();
+    QString str = global_string;          // str is a deep copy of global_string
+    global_mutex.unlock();
+
+    // process the string data
+    ...
+
+    // update global_string
+    setGlobalString( str );
+}
+//! [3]