blocxx

IntrusiveCountableBase.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2005, Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2006, Novell, Inc. All rights reserved.
00004 * 
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 * 
00008 *     * Redistributions of source code must retain the above copyright notice,
00009 *       this list of conditions and the following disclaimer.
00010 *     * Redistributions in binary form must reproduce the above copyright
00011 *       notice, this list of conditions and the following disclaimer in the
00012 *       documentation and/or other materials provided with the distribution.
00013 *     * Neither the name of 
00014 *       Vintela, Inc., 
00015 *       nor Novell, Inc., 
00016 *       nor the names of its contributors or employees may be used to 
00017 *       endorse or promote products derived from this software without 
00018 *       specific prior written permission.
00019 * 
00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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00032 
00033 
00038 //
00039 //  Copyright (c) 2001, 2002 Peter Dimov
00040 //
00041 //  Permission to copy, use, modify, sell and distribute this software
00042 //  is granted provided this copyright notice appears in all copies.
00043 //  This software is provided "as is" without express or implied
00044 //  warranty, and with no claim as to its suitability for any purpose.
00045 //
00046 
00047 #ifndef BLOCXX_INTRUSIVE_COUNTABLE_BASE_HPP_INCLUDE_GUARD_
00048 #define BLOCXX_INTRUSIVE_COUNTABLE_BASE_HPP_INCLUDE_GUARD_
00049 
00050 #include "blocxx/BLOCXX_config.h"
00051 #include "blocxx/RefCount.hpp"
00052 
00053 namespace BLOCXX_NAMESPACE
00054 {
00055 
00062 class IntrusiveCountableBase; 
00063 void IntrusiveReferenceAddRef(IntrusiveCountableBase * p); 
00064 void IntrusiveReferenceRelease(IntrusiveCountableBase * p); 
00065 
00066 class BLOCXX_COMMON_API IntrusiveCountableBase
00067 {
00068 private:
00069    RefCount m_useCount;
00070 
00071 protected:
00072    IntrusiveCountableBase()
00073       : m_useCount(0)
00074    {
00075    }
00076    
00077    IntrusiveCountableBase(const IntrusiveCountableBase&)
00078       : m_useCount(0)
00079    {
00080    }
00081    
00082    IntrusiveCountableBase& operator=(const IntrusiveCountableBase&)
00083    {
00084       // don't change m_useCount
00085       return *this;
00086    }
00087 
00088    virtual ~IntrusiveCountableBase();
00089 
00090 public:
00091    inline friend void IntrusiveReferenceAddRef(IntrusiveCountableBase * p)
00092    {
00093       p->m_useCount.inc();
00094    }
00095 
00096    inline friend void IntrusiveReferenceRelease(IntrusiveCountableBase * p)
00097    {
00098       if (p->m_useCount.decAndTest())
00099          delete p;
00100    }
00101 };
00102 
00103 } // end namespace BLOCXX_NAMESPACE
00104 
00105 #endif
00106