dom_misc.h
00001 /* 00002 * This file is part of the DOM implementation for KDE. 00003 * 00004 * (C) 1999 Lars Knoll (knoll@kde.org) 00005 * 00006 * This library is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Library General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2 of the License, or (at your option) any later version. 00010 * 00011 * This library is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Library General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Library General Public License 00017 * along with this library; see the file COPYING.LIB. If not, write to 00018 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 00019 * Boston, MA 02111-1307, USA. 00020 * 00021 */ 00022 #ifndef _DOM_RefCountImpl_h_ 00023 #define _DOM_RefCountImpl_h_ 00024 00025 namespace DOM { 00026 00027 /* 00028 * This implements the reference counting scheme used for all internal 00029 * DOM objects. 00030 * 00031 * Other objects should overload deleteMe() to fit their needs. The default 00032 * implementation deletes the object if the ref count drops to 0. 00033 */ 00034 class DomShared 00035 { 00036 public: 00037 DomShared() : _ref( 0 ) {} 00038 virtual ~DomShared(); 00039 00040 /* Overload this function if you want a different deletion behavior 00041 */ 00042 virtual bool deleteMe(); 00043 00044 void ref() { _ref++; } 00045 void deref() { if(_ref) _ref--; if(!_ref && deleteMe()) delete this; } 00046 bool hasOneRef() const { return _ref == 1; } 00047 unsigned int refCount() const { return _ref; } 00048 00049 protected: 00050 // the number of DOMObjects referencing this Node 00051 // An implementation object will delete itself, if it has 00052 // no DOMObject referencing it, and deleteMe() returns true. 00053 unsigned int _ref; 00054 }; 00055 00056 } // namespace 00057 00058 #endif