--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/qt3support/tools/q3deepcopy.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,123 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt3Support module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "q3deepcopy.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class Q3DeepCopy
+    \brief The Q3DeepCopy class is a template class which ensures that
+    implicitly shared and explicitly shared classes reference unique
+    data.
+
+    \reentrant
+
+    \compat
+
+    Normally, shared copies reference the same data to optimize memory
+    use and for maximum speed. In the example below, \c s1, \c s2, \c
+    s3, \c s4 and \c s5 share data.
+
+    \snippet doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp 0
+
+    Q3DeepCopy can be used several ways to ensure that an object
+    references unique, unshared data. In the example below, \c s1, \c
+    s2 and \c s5 share data, while neither \c s3 nor \c s4 share data.
+    \snippet doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp 1
+
+    In the example below, \c s1, \c s2 and \c s5 share data, and \c s3
+    and \c s4 share data.
+    \snippet doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp 2
+
+    Q3DeepCopy can also provide safety in multithreaded applications
+    that use shared classes. In the example below, the variable \c
+    global_string is used safely since the data contained in \c
+    global_string is always a deep copy. This ensures that all threads
+    get a unique copy of the data, and that any assignments to \c
+    global_string will result in a deep copy.
+
+    \snippet doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp 3
+
+    \warning It is the application developer's responsibility to
+    protect the object shared across multiple threads.
+
+    The examples above use QString, which is an implicitly shared
+    class. The behavior of Q3DeepCopy is the same when using explicitly
+    shared classes like QByteArray.
+
+    Currently, Q3DeepCopy works with the following classes:
+    \list
+    \i QMemArray (including subclasses like QByteArray and QCString)
+    \i QMap
+    \i QString
+    \i QValueList (including subclasses like QStringList and QValueStack)
+    \i QValueVector
+    \endlist
+
+    \sa \link threads.html Thread Support in Qt \endlink
+*/
+
+/*!
+    \fn Q3DeepCopy::Q3DeepCopy()
+
+    Constructs an empty instance of type \e T.
+*/
+
+/*!
+    \fn Q3DeepCopy::Q3DeepCopy( const T &t )
+
+    Constructs a deep copy of \a t.
+*/
+
+/*!
+    \fn Q3DeepCopy<T>& Q3DeepCopy::operator=( const T &t )
+
+    Assigns a deep copy of \a t.
+*/
+
+/*!
+    \fn Q3DeepCopy::operator T ()
+
+    Returns a deep copy of the encapsulated data.
+*/
+
+QT_END_NAMESPACE