/****************************************************************************
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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** Foundation and appearing in the file LICENSE.LGPL included in the
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//
//  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_BooleanFNs_H
#define Patternist_BooleanFNs_H

#include "qfunctioncall_p.h"

/**
 * @file
 * @short Contains classes implementing the functions found in
 * <a href="http://www.w3.org/TR/xpath-functions/#boolean-functions">XQuery 1.0 and
 * XPath 2.0 Functions and Operators, 9 Functions and Operators on Boolean Values</a>.
 *
 * @ingroup Patternist_functions
 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Implements the function <tt>fn:true()</tt>.
     *
     * The implementation always rewrites itself to a boolean value at compile time.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class TrueFN : public FunctionCall
    {
    public:
        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:false()</tt>.
     *
     * The implementation always rewrites itself to a boolean value at compile time.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class FalseFN : public FunctionCall
    {
    public:
        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:not()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class NotFN : public FunctionCall
    {
    public:
        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
        virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif
