QxOrm  1.4.5
C++ Object Relational Mapping library
QxModelRowCompare.h
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00001 /****************************************************************************
00002 **
00003 ** https://www.qxorm.com/
00004 ** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
00005 **
00006 ** This file is part of the QxOrm library
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00008 ** This software is provided 'as-is', without any express or implied
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00012 ** Commercial Usage
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00016 ** a written agreement between you and Lionel Marty
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00018 ** GNU General Public License Usage
00019 ** Alternatively, this file may be used under the terms of the GNU
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00031 
00032 #ifndef _QX_MODEL_ROW_COMPARE_H_
00033 #define _QX_MODEL_ROW_COMPARE_H_
00034 
00035 #ifdef _MSC_VER
00036 #pragma once
00037 #endif
00038 
00046 #include <QxDataMember/IxDataMember.h>
00047 
00048 namespace qx {
00049 namespace model_view {
00050 
00051 QX_DLL_EXPORT bool compareQVariant(const QVariant & v1, const QVariant & v2, bool bAscending) QX_USED;
00052 
00057 template <typename T>
00058 struct QxModelRowCompare
00059 {
00060 
00061    bool m_bAscendingOrder;             
00062    qx::IxDataMember * m_pDataMember;   
00063 
00064    QxModelRowCompare(bool bAscendingOrder, qx::IxDataMember * pDataMember) : m_bAscendingOrder(bAscendingOrder), m_pDataMember(pDataMember) { qAssert(m_pDataMember != NULL); }
00065 
00066    bool operator()(const T & t1, const T & t2) const
00067    {
00068       if (! m_pDataMember || ! t1.second || ! t2.second) { return false; }
00069       QVariant v1 = m_pDataMember->toVariant(& (* t1.second));
00070       QVariant v2 = m_pDataMember->toVariant(& (* t2.second));
00071       return qx::model_view::compareQVariant(v1, v2, m_bAscendingOrder);
00072    }
00073 
00074 };
00075 
00076 } // namespace model_view
00077 } // namespace qx
00078 
00079 #endif // _QX_MODEL_ROW_COMPARE_H_