text: /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL21$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
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  ** information use the contact form at http://www.qt.io/contact-us.
  **
  ** 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 or version 3 as published by the Free
  ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
  ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
  ** following information to ensure the GNU Lesser General Public License
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  ** As a special exception, The Qt Company gives you certain additional
  ** rights. These rights are described in The Qt Company LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  //
  //  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 <private/qcommonvalues_p.h>
  #include <private/qdecimal_p.h>
  #include <private/qschemanumeric_p.h>
  #include <private/qvalidationerror_p.h>
  #include <private/qbuiltintypes_p.h>
  
  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_tpl_p.h"
  
      /**
       * @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
  
  #endif
  