22fa3b3922
FreeCADs property system utilises some pointer math to calculate the offset between property and base class. Due to virtual inheritance of th ePropertyContainer the memory layout has been changed to rather random, which has lead to crashes dependend on the order of object initialisation. The solution is to not make PropertyContaner virtual but a class below, Base::Persitance. Then the memory layout is random for Persistance, but it is perfectly aligned for the base class chains from PropertyContainer onwards as well as from Extension onwards. Hence the proeprty system was changed to take the offset always from those two.
73 lines
3.1 KiB
C++
73 lines
3.1 KiB
C++
/***************************************************************************
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* Copyright (c) Stefan Tröger (stefantroeger@gmx.net) 2016 *
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* *
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* This file is part of the FreeCAD CAx development system. *
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Library General Public *
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* License as published by the Free Software Foundation; either *
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* version 2 of the License, or (at your option) any later version. *
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* *
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* This library is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Library General Public License for more details. *
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* *
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* You should have received a copy of the GNU Library General Public *
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* License along with this library; see the file COPYING.LIB. If not, *
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* write to the Free Software Foundation, Inc., 59 Temple Place, *
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* Suite 330, Boston, MA 02111-1307, USA *
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* *
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***************************************************************************/
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#ifndef APP_DOCUMENTOBJECTEXTENSION_H
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#define APP_DOCUMENTOBJECTEXTENSION_H
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#include "Extension.h"
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#include "DocumentObject.h"
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namespace App {
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/**
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* @brief Extension with special document object calls
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*
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*/
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class AppExport DocumentObjectExtension : public App::Extension
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{
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//The cass does not have properties itself, but it is important to provide the property access
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//functions. see cpp file for details
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EXTENSION_PROPERTY_HEADER(App::DocumentObjectExtension );
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public:
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DocumentObjectExtension ();
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virtual ~DocumentObjectExtension ();
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App::DocumentObject* getExtendedObject();
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const App::DocumentObject* getExtendedObject() const;
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//override if execution is nesseccary
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virtual short extensionMustExecute(void);
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virtual App::DocumentObjectExecReturn *extensionExecute(void);
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/// get called after setting the document
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virtual void onExtendedSettingDocument();
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/// get called after a brand new object was created
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virtual void onExtendedSetupObject();
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/// get called when object is going to be removed from the document
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virtual void onExtendedUnsetupObject();
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virtual PyObject* getExtensionPyObject(void);
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/// returns the type name of the ViewProviderExtension which is automatically attached
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/// to the viewprovider object when it is initiated
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virtual const char* getViewProviderExtensionName(void) const {return "";};
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};
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} //App
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#endif // APP_DOCUMENTOBJECTEXTENSION_H
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