00001 /*************************************************************************** 00002 ** 00003 ** This file is part of QGpCoreTools. 00004 ** 00005 ** This library is free software; you can redistribute it and/or 00006 ** modify it under the terms of the GNU Lesser General Public 00007 ** License as published by the Free Software Foundation; either 00008 ** version 2.1 of the License, or (at your option) any later version. 00009 ** 00010 ** This file is distributed in the hope that it will be useful, but WITHOUT 00011 ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 00012 ** FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 00013 ** License for more details. 00014 ** 00015 ** You should have received a copy of the GNU Lesser General Public 00016 ** License along with this library; if not, write to the Free Software 00017 ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00018 ** 00019 ** See http://www.geopsy.org for more information. 00020 ** 00021 ** Created : 2006-05-17 00022 ** Authors : 00023 ** Marc Wathelet 00024 ** Marc Wathelet (LGIT, Grenoble, France) 00025 ** 00026 ***************************************************************************/ 00027 00028 #ifndef SHAREDOBJECT_H 00029 #define SHAREDOBJECT_H 00030 00031 #include <QtCore> 00032 00033 #include "Global.h" 00034 #include "QGpCoreToolsDLLExport.h" 00035 00036 namespace QGpCoreTools { 00037 00038 class QGPCORETOOLS_EXPORT SharedObject 00039 { 00040 public: 00041 SharedObject() {_referenceCount=0;} 00042 SharedObject(const SharedObject&) {_referenceCount=0;} 00043 virtual ~SharedObject() {ASSERT(_referenceCount<=0);} 00044 00045 void operator=(const SharedObject&) {} 00046 00047 void addReference() {_referenceCount.fetchAndAddOrdered(1);} 00048 bool removeReference() {return _referenceCount.fetchAndAddOrdered(-1)<=1;} 00049 int referenceCount() const {return _referenceCount.fetchAndAddOrdered(0);} 00050 00051 static inline void removeReference(SharedObject * object); 00052 private: 00053 mutable QAtomicInt _referenceCount; 00054 }; 00055 00056 inline void SharedObject::removeReference(SharedObject * object) 00057 { 00058 if(object->removeReference()) delete object; 00059 } 00060 00061 } // namespace QGpCoreTools 00062 00063 #endif // SHAREDOBJECT_H
