1 files changed, 120 insertions, 0 deletions
diff --git a/src/core/conversion_check.h b/src/core/conversion_check.h
new file mode 100644
index 00000000..23bdcf04
--- /dev/null
+++ b/src/core/conversion_check.h
@@ -0,0 +1,120 @@
+/*
+   This file is part of the KDE libraries
+   Copyright (c) 2006 Thomas Braxton <brax108@cox.net>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+
+#ifndef CONVERSION_CHECK_H
+#define CONVERSION_CHECK_H
+
+#include <QtCore/QString>
+#include <QtCore/QDate>
+#include <QtCore/QPoint>
+#include <QtCore/QSize>
+#include <QtCore/QRect>
+#include <QtCore/QVariant>
+
+class QColor;
+class QFont;
+
+namespace ConversionCheck {
+
+// used to distinguish between supported/unsupported types
+struct supported { };
+struct unsupported { };
+
+// traits type class to define support for constraints
+template <typename T>
+struct QVconvertible
+{
+  typedef unsupported toQString;
+  typedef unsupported toQVariant;
+};
+
+// constraint classes
+template <typename T>
+struct type_toQString
+{
+  void constraint() { supported x = y; Q_UNUSED(x); }
+  typename QVconvertible<T>::toQString y;
+};
+
+template <typename T>
+struct type_toQVariant
+{
+  void constraint() { supported x = y; Q_UNUSED(x); }
+  typename QVconvertible<T>::toQVariant y;
+};
+
+
+// check if T is convertible to QString thru QVariant
+// if not supported can't be used in QList<T> functions
+template <typename T>
+inline void to_QString()
+{
+  void (type_toQString<T>::*x)() = &type_toQString<T>::constraint;
+  Q_UNUSED(x);
+}
+
+// check if T is convertible to QVariant & supported in readEntry/writeEntry
+template <typename T>
+inline void to_QVariant()
+{
+  void (type_toQVariant<T>::*x)() = &type_toQVariant<T>::constraint;
+  Q_UNUSED(x);
+}
+
+// define for all types handled in readEntry/writeEntry
+// string_support - is supported by QVariant(type).toString(),
+//                  can be used in QList<T> functions
+// variant_support - has a QVariant constructor
+#define QVConversions(type, string_support, variant_support) \
+template <> struct QVconvertible<type> {\
+ typedef string_support toQString;\
+ typedef variant_support toQVariant;\
+}
+
+// The only types needed here are the types handled in readEntry/writeEntry
+// the default QVconvertible will take care of the rest.
+QVConversions(bool, supported, supported);
+QVConversions(int, supported, supported);
+QVConversions(unsigned int, supported, supported);
+QVConversions(long long, supported, supported);
+QVConversions(unsigned long long, supported, supported);
+QVConversions(float, supported, supported);
+QVConversions(double, supported, supported);
+QVConversions(QString, supported, supported);
+QVConversions(QColor, unsupported, supported);
+QVConversions(QFont, supported, supported);
+QVConversions(QDateTime, unsupported, supported);
+QVConversions(QDate, unsupported, supported);
+QVConversions(QSize, unsupported, supported);
+QVConversions(QRect, unsupported, supported);
+QVConversions(QPoint, unsupported, supported);
+QVConversions(QSizeF, unsupported, supported);
+QVConversions(QRectF, unsupported, supported);
+QVConversions(QPointF, unsupported, supported);
+QVConversions(QByteArray, supported, supported);
+QVConversions(QStringList, unsupported, supported);
+QVConversions(QVariantList, unsupported, supported);
+QVConversions(QUrl, supported, supported);
+QVConversions(QList<QUrl>, unsupported, supported);
+}
+
+#endif
+