qgsunsetattributevalue.h

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/***************************************************************************
                         qgsunsetattributevalue.h
                         ------------------------
    begin                : July 2022
    copyright            : (C) 2022 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSUNSETATTRIBUTEVALUE_H
#define QGSUNSETATTRIBUTEVALUE_H
 
#include "qgis.h"
#include "qgis_core.h"
 
#include <QString>
#include <QVariant>
 
using namespace Qt::StringLiterals;

class CORE_EXPORT QgsUnsetAttributeValue
{
  public:
 
    QgsUnsetAttributeValue() = default;

    explicit QgsUnsetAttributeValue( const QString &defaultValueClause );

    QString defaultValueClause() const { return mDefaultValueClause; }

    inline bool operator==( const QgsUnsetAttributeValue & ) const { return true; }

    inline bool operator!=( const QgsUnsetAttributeValue & ) const { return false; }
 
#ifdef SIP_RUN
    SIP_PYOBJECT __repr__();
    % MethodCode
    QString str;
    if ( !sipCpp->defaultValueClause().isEmpty() )
      str = u"<QgsUnsetAttributeValue: %1>"_s.arg( sipCpp->defaultValueClause() );
    else
      str = u"<QgsUnsetAttributeValue>"_s;
    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
    % End
#endif

    operator QVariant() const
    {
      return QVariant::fromValue( *this );
    }
 
  private:
 
    QString mDefaultValueClause;
 
};
 
Q_DECLARE_METATYPE( QgsUnsetAttributeValue )
 
#ifndef SIP_RUN
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wattributes"
#elif defined(_MSC_VER)
__pragma( warning( push ) )
__pragma( warning( disable: 4273 ) )
#endif
#endif
 
inline bool CORE_EXPORT operator==( const QgsUnsetAttributeValue &value, const QString &other )
{
  return other == value.defaultValueClause();
}
 
#ifndef SIP_RUN
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) || defined(__clang__)
#pragma GCC diagnostic pop
#elif defined(_MSC_VER)
__pragma( warning( pop ) )
#endif
#endif
 
inline bool operator!=( const QgsUnsetAttributeValue &value, const QString &other )
{
  return other != value.defaultValueClause();
}
 
#ifndef SIP_RUN
inline bool operator==( const QString &other, const QgsUnsetAttributeValue &value )
{
  return other == value.defaultValueClause();
}
 
inline bool operator!=( const QString &other, const QgsUnsetAttributeValue &value )
{
  return other != value.defaultValueClause();
}
#endif
 
#endif // QGSUNSETATTRIBUTEVALUE_H