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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_AbstractFloat_H
#define Patternist_AbstractFloat_H
#include <math.h>
#include <qnumeric.h>
#include "qcommonvalues_p.h"
#include "qdecimal_p.h"
#include "qschemanumeric_p.h"
#include "qvalidationerror_p.h"
#include "qbuiltintypes_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Base template class for Float and Double classes.
*
* @author Vincent Ricard <magic@magicninja.org>
* @ingroup Patternist_xdm
*/
template <const bool isDouble>
class AbstractFloat : public Numeric
{
public:
static Numeric::Ptr fromValue(const xsDouble num);
static AtomicValue::Ptr fromLexical(const QString &strNumeric);
/**
* @todo more extensive docs.
*
* Performs floating point comparison.
*
* @returns @c true if @p a and @p are equal, otherwise @c false.
*/
static bool isEqual(const xsDouble a, const xsDouble b);
/**
* Determines the Effective %Boolean Value of this number.
*
* @returns @c false if the number is 0 or @c NaN, otherwise @c true.
*/
bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const;
/**
* Returns this AbstractFloat represented as an @c xs:string.
*
* @note In the XPath/XQuery languages, converting @c xs:double and @c xs:float
* to @c xs:string is not specified in XML Schema 1.0 Part 2: Datatypes Second Edition,
* but in XQuery 1.0 and XPath 2.0 Functions and Operators. This will change with W3C XML
* Schema 1.1
*
* @see <a href="http://www.w3.org/TR/xpath-functions/#casting-to-string">XQuery 1.0
* and XPath 2.0 Functions and Operators, 17.1.2 Casting to xs:string and xdt:untypedAtomic</a>
*/
virtual QString stringValue() const;
virtual xsDouble toDouble() const;
virtual xsInteger toInteger() const;
virtual xsFloat toFloat() const;
virtual xsDecimal toDecimal() const;
virtual Numeric::Ptr round() const;
virtual Numeric::Ptr roundHalfToEven(const xsInteger scale) const;
virtual Numeric::Ptr floor() const;
virtual Numeric::Ptr ceiling() const;
virtual Numeric::Ptr abs() const;
virtual bool isNaN() const;
virtual bool isInf() const;
virtual ItemType::Ptr type() const;
virtual Item toNegated() const;
virtual qulonglong toUnsignedInteger() const;
virtual bool isSigned() const;
protected:
AbstractFloat(const xsDouble num);
private:
/**
* From the Open Group's man page: "The signbit() macro shall return a
* non-zero value if and only if the sign of its argument value is
* negative."
*
* MS Windows doesn't have std::signbit() so here's
* a reinvention of that function.
*/
static inline int internalSignbit(const xsDouble v);
inline bool isZero() const;
const xsDouble m_value;
};
template <const bool isDouble>
Numeric::Ptr createFloat(const xsDouble num);
#include "qabstractfloat.cpp"
/**
* @short An instantiation of AbsbstractFloat suitable for @c xs:double.
*
* @ingroup Patternist_xdm
*/
typedef AbstractFloat<true> Double;
/**
* @short An instantiation of AbstractFloat suitable for @c xs:float.
*
* @ingroup Patternist_xdm
*/
typedef AbstractFloat<false> Float;
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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