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refobj.h

00001 /*
00002   libwftk - Worldforge Toolkit - a widget library
00003   Copyright (C) 2002 Malcolm Walker <malcolm@worldforge.org>
00004   Based on code copyright  (C) 1999-2002  Karsten Laux
00005 
00006   This library is free software; you can redistribute it and/or
00007   modify it under the terms of the GNU Lesser General Public
00008   License as published by the Free Software Foundation; either
00009   version 2.1 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   Lesser General Public License for more details.
00015   
00016   You should have received a copy of the GNU Lesser General Public
00017   License along with this library; if not, write to the
00018   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00019   Boston, MA  02111-1307, SA.
00020 */
00021 
00022 #ifndef WFTK_REF_OBJ_H
00023 #define WFTK_REF_OBJ_H
00024 
00025 #include <cassert>
00026 #include <SDL/SDL_types.h> // for Uint32
00027 
00028 namespace wftk {
00029 
00030 class RefCountObj {
00031  public:
00032   // a 0 refcount, but not deleted, acts as a 'floating' reference
00033   RefCountObj(bool floating) : refcount_(floating ? 0 : 1) {}
00034   virtual ~RefCountObj() {}
00035 
00037   void ref() {++refcount_;}
00039   void unref() {assert(refcount_); if(!--refcount_) delete this;}
00041 
00048   void sink() {if(!refcount_) delete this;}
00049 
00050  private:
00051   // unimplemented
00052   RefCountObj(const RefCountObj&);
00053   RefCountObj& operator=(const RefCountObj&);
00054 
00055   Uint32 refcount_;
00056 };
00057 
00058 } // namespace
00059 
00060 #endif // WFTK_REF_OBJ_H

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