IntrusiveCountableBase.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2005 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 *
00011 *  - Redistributions in binary form must reproduce the above copyright notice,
00012 *    this list of conditions and the following disclaimer in the documentation
00013 *    and/or other materials provided with the distribution.
00014 *
00015 *  - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its
00016 *    contributors may be used to endorse or promote products derived from this
00017 *    software without specific prior written permission.
00018 *
00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
00020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00022 * ARE DISCLAIMED. IN NO EVENT SHALL Vintela, Inc., Novell, Inc., OR THE 
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00031 
00032 
00037 //
00038 //  Copyright (c) 2001, 2002 Peter Dimov
00039 //
00040 //  Permission to copy, use, modify, sell and distribute this software
00041 //  is granted provided this copyright notice appears in all copies.
00042 //  This software is provided "as is" without express or implied
00043 //  warranty, and with no claim as to its suitability for any purpose.
00044 //
00045 
00046 #ifndef BLOCXX_INTRUSIVE_COUNTABLE_BASE_HPP_INCLUDE_GUARD_
00047 #define BLOCXX_INTRUSIVE_COUNTABLE_BASE_HPP_INCLUDE_GUARD_
00048 
00049 #include "blocxx/BLOCXX_config.h"
00050 #include "blocxx/RefCount.hpp"
00051 
00052 namespace BLOCXX_NAMESPACE
00053 {
00054 
00061 class IntrusiveCountableBase; 
00062 void IntrusiveReferenceAddRef(IntrusiveCountableBase * p); 
00063 void IntrusiveReferenceRelease(IntrusiveCountableBase * p); 
00064 
00065 class BLOCXX_COMMON_API IntrusiveCountableBase
00066 {
00067 private:
00068    RefCount m_useCount;
00069 
00070 protected:
00071    IntrusiveCountableBase()
00072       : m_useCount(0)
00073    {
00074    }
00075    
00076    IntrusiveCountableBase(const IntrusiveCountableBase&)
00077       : m_useCount(0)
00078    {
00079    }
00080    
00081    IntrusiveCountableBase& operator=(const IntrusiveCountableBase&)
00082    {
00083       // don't change m_useCount
00084       return *this;
00085    }
00086 
00087    virtual ~IntrusiveCountableBase();
00088 
00089 public:
00090    inline friend void IntrusiveReferenceAddRef(IntrusiveCountableBase * p)
00091    {
00092       p->m_useCount.inc();
00093    }
00094 
00095    inline friend void IntrusiveReferenceRelease(IntrusiveCountableBase * p)
00096    {
00097       if (p->m_useCount.decAndTest())
00098          delete p;
00099    }
00100 };
00101 
00102 } // end namespace BLOCXX_NAMESPACE
00103 
00104 #endif
00105 

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