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diff --git a/src/script/api/qscriptstring_impl_p.h b/src/script/api/qscriptstring_impl_p.h
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+++ b/src/script/api/qscriptstring_impl_p.h
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+/****************************************************************************
+**
+** 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 QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL-ONLY$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCRIPTSTRING__IMPL_P_H
+#define QSCRIPTSTRING__IMPL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qscriptconverter_p.h"
+#include "qscriptstring_p.h"
+#include "qscriptengine_p.h"
+#include <QtCore/qnumeric.h>
+#include <QtCore/qshareddata.h>
+#include <QtCore/qhash.h>
+#include "qscriptisolate_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QScriptStringPrivate::QScriptStringPrivate()
+    : m_engine(0)
+{}
+
+QScriptStringPrivate::QScriptStringPrivate(QScriptEnginePrivate *engine, v8::Handle<v8::String> str)
+    : m_engine(engine)
+{
+    const v8::String::Utf8Value utf8(str);
+    m_string = v8::Persistent<v8::String>::New(v8::String::NewSymbol(*utf8, utf8.length()));
+    Q_ASSERT(!m_string.IsEmpty());
+    m_engine->registerString(this);
+}
+
+QScriptStringPrivate::~QScriptStringPrivate()
+{
+    if (isValid()) {
+        QScriptIsolate api(m_engine);
+        m_engine->unregisterString(this);
+        m_string.Dispose();
+    }
+}
+
+/*!
+  \internal
+  Change this string to an invalid one
+*/
+inline void QScriptStringPrivate::reinitialize()
+{
+    if (isValid()) {
+        m_engine->unregisterString(this);
+        m_string.Dispose();
+        m_string.Clear();
+        m_engine = 0;
+    }
+    Q_ASSERT(!isValid());
+}
+
+QScriptString QScriptStringPrivate::get(QScriptStringPrivate* d)
+{
+    Q_ASSERT(d);
+    return QScriptString(d);
+}
+
+QScriptString QScriptStringPrivate::get(QScriptPassPointer<QScriptStringPrivate> d)
+{
+    Q_ASSERT(d);
+    return QScriptString(d);
+}
+
+QScriptStringPrivate* QScriptStringPrivate::get(const QScriptString& p)
+{
+    return p.d_ptr.data();
+}
+
+bool QScriptStringPrivate::isValid() const
+{
+    return !m_string.IsEmpty();
+}
+
+bool QScriptStringPrivate::operator==(const QScriptStringPrivate& other) const
+{
+    v8::HandleScope handleScope;
+    return isValid() && other.isValid() && m_string->Equals(other.m_string);
+}
+
+bool QScriptStringPrivate::operator!=(const QScriptStringPrivate& other) const
+{
+    v8::HandleScope handleScope;
+    return isValid() && other.isValid() && !m_string->Equals(other.m_string);
+}
+
+quint32 QScriptStringPrivate::toArrayIndex(bool* ok) const
+{
+    quint32 idx = 0xffffffff;
+    if (isValid()) {
+        v8::HandleScope handleScope;
+        v8::Handle<v8::Uint32> converted = m_string->ToArrayIndex();
+        if (!converted.IsEmpty())
+            idx = converted->Uint32Value();
+    }
+    if (ok)
+        *ok = (idx != 0xffffffff);
+    return idx;
+}
+
+QString QScriptStringPrivate::toString() const
+{
+    return QScriptConverter::toString(m_string);
+}
+
+quint64 QScriptStringPrivate::id() const
+{
+    return m_string->Hash();
+}
+
+inline QScriptStringPrivate::operator v8::Handle<v8::String>() const
+{
+    Q_ASSERT(isValid());
+    return m_string;
+}
+
+inline v8::Handle<v8::String> QScriptStringPrivate::asV8Value()const
+{
+    return m_string;
+}
+
+inline QScriptEnginePrivate* QScriptStringPrivate::engine() const
+{
+    return m_engine;
+}
+
+QT_END_NAMESPACE
+
+#endif