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 * $Id: dom_misc.h,v 1.9.4.1 2003/05/18 12:34:37 mueller Exp $ 00022 */ 00023 #ifndef _DOM_RefCountImpl_h_ 00024 #define _DOM_RefCountImpl_h_ 00025 00026 namespace DOM { 00027 00028 /* 00029 * This implements the reference counting scheme used for all internal 00030 * DOM objects. 00031 * 00032 * Other objects should overload deleteMe() to fit their needs. The default 00033 * implementation deletes the object if the ref count drops to 0. 00034 */ 00035 class DomShared 00036 { 00037 public: 00038 DomShared() : _ref( 0 ) {} 00039 virtual ~DomShared(); 00040 00041 /* Overload this function if you want a different deletion behaviour 00042 */ 00043 virtual bool deleteMe(); 00044 00045 void ref() { _ref++; } 00046 void deref() { if(_ref) _ref--; if(!_ref && deleteMe()) delete this; } 00047 bool hasOneRef() const { return _ref == 1; } 00048 unsigned int refCount() const { return _ref; } 00049 00050 protected: 00051 // the number of DOMObjects referencing this Node 00052 // An implementation object will delete itself, if it has 00053 // no DOMObject referencing it, and deleteMe() returns true. 00054 unsigned int _ref; 00055 }; 00056 00057 } // namespace 00058 00059 #endif