Implement QMetaTypeSwitcher.
Currently one of the most common coding pattern, when working with QMetaType types, is to switch over all types ids to convert a given type id to a real c++ type. The pattern is not perfect, because of: - code duplication - to convert type id to a real type a user has to write own switch case - maintenance - adding new type to QMetaType::Types doesn't propagate to other parts of code. Proposed type switcher can solve the issue by switching type id and delegating found c++ type. The class is created for internal use only and was created to simplify common problems in QtDeclarative, QtScript and QVariant. Change-Id: I0567ef908024b3b05ee18126f98a73a74748fbd2 Reviewed-by: Olivier Goffart <ogoffart@woboq.com>bb10
Jędrzej Nowacki
Qt by Nokia
parent
eda469d3a0
commit
2b39be6dd5
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@ -37,7 +37,8 @@ HEADERS += \
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kernel/qfunctions_p.h \
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kernel/qmath.h \
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kernel/qsystemerror_p.h \
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kernel/qmetatype_p.h
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kernel/qmetatype_p.h \
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kernel/qmetatypeswitcher_p.h \
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SOURCES += \
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kernel/qabstracteventdispatcher.cpp \
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@ -0,0 +1,101 @@
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QMETATYPESWITCHER_P_H
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#define QMETATYPESWITCHER_P_H
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#include "qmetatype.h"
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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class QMetaTypeSwitcher {
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public:
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typedef void *UnknownType;
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template<class ReturnType, class DelegateObject>
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static ReturnType switcher(DelegateObject &logic, int type, const void *data);
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};
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#define QT_METATYPE_SWICHER_CASE_PRIMITIVE(TypeName, TypeId, Name)\
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case QMetaType::TypeName: return logic.delegate(static_cast<const Name *>(data));
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#define QT_METATYPE_SWICHER_CASE_PRIMITIVE_POINTER(TypeName, TypeId, Name)\
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case QMetaType::TypeName: return logic.delegate(static_cast< Name * const *>(data));
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#define QT_METATYPE_SWICHER_CASE_POINTER(TypeName, TypeId, Name)\
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case QMetaType::TypeName: return logic.delegate(static_cast< QT_PREPEND_NAMESPACE(Name) * const *>(data));
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#define QT_METATYPE_SWICHER_CASE_QCLASS(TypeName, TypeId, Name)\
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case QMetaType::TypeName: return logic.delegate(static_cast<const QT_PREPEND_NAMESPACE(Name) *>(data));
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template<class ReturnType, class DelegateObject>
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ReturnType QMetaTypeSwitcher::switcher(DelegateObject &logic, int type, const void *data)
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{
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switch (QMetaType::Type(type)) {
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QT_FOR_EACH_STATIC_PRIMITIVE_TYPE(QT_METATYPE_SWICHER_CASE_PRIMITIVE)
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QT_FOR_EACH_STATIC_PRIMITIVE_POINTER(QT_METATYPE_SWICHER_CASE_PRIMITIVE_POINTER)
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QT_FOR_EACH_STATIC_CORE_POINTER(QT_METATYPE_SWICHER_CASE_POINTER)
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QT_FOR_EACH_STATIC_CORE_CLASS(QT_METATYPE_SWICHER_CASE_QCLASS)
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QT_FOR_EACH_STATIC_CORE_TEMPLATE(QT_METATYPE_SWICHER_CASE_QCLASS)
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QT_FOR_EACH_STATIC_GUI_CLASS(QT_METATYPE_SWICHER_CASE_QCLASS)
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QT_FOR_EACH_STATIC_WIDGETS_CLASS(QT_METATYPE_SWICHER_CASE_QCLASS)
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default:
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return logic.delegate(static_cast<const UnknownType *>(data));
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}
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}
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#undef QT_METATYPE_SWICHER_CASE_PRIMITIVE
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#undef QT_METATYPE_SWICHER_CASE_PRIMITIVE_POINTER
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#undef QT_METATYPE_SWICHER_CASE_QCLASS
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#undef QT_METATYPE_SWICHER_CASE_POINTER
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#endif // QMETATYPESWITCHER_P_H
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