Add QTypeModuleInfo template class

From time to time it is necessary to know from which module a type comes
from. This information couldn't be part of QTypeInfo as id doesn't work
for forward declared types.

QTypeModuleInfo should stay for Qt internal usage only.

Change-Id: Ia53747c88293fc0cdaffef919b94c653412779d3
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

src/corelib/kernel/kernel.pri

@@ -36,7 +36,8 @@ HEADERS += \
         kernel/qsystemsemaphore_p.h \
         kernel/qfunctions_p.h \
         kernel/qmath.h \
-        kernel/qsystemerror_p.h
+        kernel/qsystemerror_p.h \
+        kernel/qmetatype_p.h
 
 SOURCES += \
         kernel/qabstracteventdispatcher.cpp \

src/corelib/kernel/qmetatype_p.h

@@ -0,0 +1,116 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMETATYPE_P_H
+#define QMETATYPE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qmetatype.h"
+
+QT_BEGIN_NAMESPACE
+
+enum { /* TYPEMODULEINFO flags */
+    Q_CORE_TYPE = 1,
+    Q_GUI_TYPE = 2,
+    Q_WIDGET_TYPE = 3
+};
+
+template <typename T>
+class QTypeModuleInfo
+{
+public:
+    enum Module {
+        IsCore = !QTypeInfo<T>::isComplex, // Primitive types are in Core
+        IsWidget = false,
+        IsGui = false,
+        IsUnknown = !IsCore
+    };
+    static inline int module() { return IsCore ? Q_CORE_TYPE : 0; }
+};
+
+#define QT_ASSIGN_TYPE_TO_MODULE(TYPE, MODULE) \
+template<> \
+class QTypeModuleInfo<TYPE > \
+{ \
+public: \
+    enum Module { \
+        IsCore = (((MODULE) == (Q_CORE_TYPE))), \
+        IsWidget = (((MODULE) == (Q_WIDGET_TYPE))), \
+        IsGui = (((MODULE) == (Q_GUI_TYPE))), \
+        IsUnknown = !(IsCore || IsWidget || IsGui) \
+    }; \
+    static inline int module() { return MODULE; } \
+    Q_STATIC_ASSERT((IsUnknown && !(IsCore || IsWidget || IsGui)) \
+                 || (IsCore && !(IsUnknown || IsWidget || IsGui)) \
+                 || (IsWidget && !(IsUnknown || IsCore || IsGui)) \
+                 || (IsGui && !(IsUnknown || IsCore || IsWidget))); \
+};
+
+
+#define QT_DECLARE_CORE_MODULE_TYPES_ITER(TypeName, TypeId, Name) \
+    QT_ASSIGN_TYPE_TO_MODULE(Name, Q_CORE_TYPE);
+#define QT_DECLARE_GUI_MODULE_TYPES_ITER(TypeName, TypeId, Name) \
+    QT_ASSIGN_TYPE_TO_MODULE(Name, Q_GUI_TYPE);
+#define QT_DECLARE_WIDGETS_MODULE_TYPES_ITER(TypeName, TypeId, Name) \
+    QT_ASSIGN_TYPE_TO_MODULE(Name, Q_WIDGET_TYPE);
+
+QT_FOR_EACH_STATIC_CORE_CLASS(QT_DECLARE_CORE_MODULE_TYPES_ITER)
+QT_FOR_EACH_STATIC_CORE_TEMPLATE(QT_DECLARE_CORE_MODULE_TYPES_ITER)
+QT_FOR_EACH_STATIC_GUI_CLASS(QT_DECLARE_GUI_MODULE_TYPES_ITER)
+QT_FOR_EACH_STATIC_WIDGETS_CLASS(QT_DECLARE_WIDGETS_MODULE_TYPES_ITER)
+
+#undef QT_DECLARE_CORE_MODULE_TYPES_ITER
+#undef QT_DECLARE_GUI_MODULE_TYPES_ITER
+#undef QT_DECLARE_WIDGETS_MODULE_TYPES_ITER
+
+QT_END_NAMESPACE
+
+#endif // QMETATYPE_P_H