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KDECore

conversion_check.h

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00001 /*
00002    This file is part of the KDE libraries
00003    Copyright (c) 2006 Thomas Braxton <brax108@cox.net>
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License as published by the Free Software Foundation; either
00008    version 2 of the License, or (at your option) any later version.
00009 
00010    This library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public License
00016    along with this library; see the file COPYING.LIB.  If not, write to
00017    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018    Boston, MA 02110-1301, USA.
00019 */
00020 
00021 
00022 #ifndef CONVERSION_CHECK_H
00023 #define CONVERSION_CHECK_H
00024 
00025 #include <QtCore/QString>
00026 #include <QtGui/QColor>
00027 #include <QtGui/QFont>
00028 #include <QtCore/QDate>
00029 #include <QtCore/QPoint>
00030 #include <QtCore/QSize>
00031 #include <QtCore/QRect>
00032 #include <kurl.h>
00033 #include <QtCore/QVariant>
00034 
00035 namespace ConversionCheck {
00036 
00037 // used to distinguish between supported/unsupported types
00038 struct supported { };
00039 struct unsupported { };
00040 
00041 // traits type class to define support for constraints
00042 template <typename T>
00043 struct QVconvertible
00044 {
00045   typedef unsupported toQString;
00046   typedef unsupported toQVariant;
00047 };
00048 
00049 // constraint classes
00050 template <typename T>
00051 struct type_toQString
00052 {
00053   void constraint() { supported x = y; }
00054   typename QVconvertible<T>::toQString y;
00055 };
00056 
00057 template <typename T>
00058 struct type_toQVariant
00059 {
00060   void constraint() { supported x = y; }
00061   typename QVconvertible<T>::toQVariant y;
00062 };
00063 
00064 
00065 // check if T is convertible to QString thru QVariant
00066 // if not supported can't be used in QList<T> functions
00067 template <typename T>
00068 inline void to_QString()
00069 {
00070   void (type_toQString<T>::*x)() = &type_toQString<T>::constraint;
00071   Q_UNUSED(x);
00072 }
00073 
00074 // check if T is convertible to QVariant & supported in readEntry/writeEntry
00075 template <typename T>
00076 inline void to_QVariant()
00077 {
00078   void (type_toQVariant<T>::*x)() = &type_toQVariant<T>::constraint;
00079   Q_UNUSED(x);
00080 }
00081 
00082 // define for all types handled in readEntry/writeEntry
00083 // string_support - is supported by QVariant(type).toString(),
00084 //                  can be used in QList<T> functions
00085 // variant_support - has a QVariant constructor
00086 #define QVConversions(type, string_support, variant_support) \
00087 template <> struct QVconvertible<type> {\
00088  typedef string_support toQString;\
00089  typedef variant_support toQVariant;\
00090 }
00091 
00092 // The only types needed here are the types handled in readEntry/writeEntry
00093 // the default QVconvertible will take care of the rest.
00094 QVConversions(bool, supported, supported);
00095 QVConversions(int, supported, supported);
00096 QVConversions(unsigned int, supported, supported);
00097 QVConversions(long long, supported, supported);
00098 QVConversions(unsigned long long, supported, supported);
00099 QVConversions(float, supported, supported);
00100 QVConversions(double, supported, supported);
00101 QVConversions(QString, supported, supported);
00102 QVConversions(QColor, unsupported, supported);
00103 QVConversions(QFont, supported, supported);
00104 QVConversions(QDateTime, unsupported, supported);
00105 QVConversions(QDate, unsupported, supported);
00106 QVConversions(QSize, unsupported, supported);
00107 QVConversions(QRect, unsupported, supported);
00108 QVConversions(QPoint, unsupported, supported);
00109 QVConversions(QSizeF, unsupported, supported);
00110 QVConversions(QRectF, unsupported, supported);
00111 QVConversions(QPointF, unsupported, supported);
00112 QVConversions(QByteArray, supported, supported);
00113 QVConversions(QStringList, unsupported, supported);
00114 QVConversions(QVariantList, unsupported, supported);
00115 QVConversions(KUrl, supported, supported);
00116 QVConversions(KUrl::List, unsupported, supported);
00117 }
00118 
00119 #endif
00120 

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