Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  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.
+
+#ifndef Patternist_Aggregator_H
+#define Patternist_Aggregator_H
+
+#include "qfunctioncall_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+
+    /**
+     * @short Carries a staticType() implementation appropriate
+     * for functions which returns a singleton value derived from its first argument.
+     *
+     * One example of such a function is FloorFN, implementing <tt>fn:floor()</tt>,
+     * which returns a single value of the same type as the first argument, or the empty
+     * sequence if the first argument evaluates to the empty sequence.
+     *
+     * Aggregator is abstract, and exists for saving code. It is inherited
+     * by classes which needs the staticType() implementation this class provides.
+     *
+     * @see Piper
+     * @ingroup Patternist_functions
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class Aggregator : public FunctionCall
+    {
+    public:
+        /**
+         * @returns a static type where the ItemType is the same as this FunctionCall's first
+         * argument, and the Cardinality is as return from Cardinality::toWithoutMany().
+         */
+        virtual SequenceType::Ptr staticType() const;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif