ReferenceBase.hpp

Go to the documentation of this file.
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 
00023 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00024 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
00025 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
00026 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
00027 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
00028 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
00029 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00030 *******************************************************************************/
00031 
00032 
00037 #ifndef BLOCXX_REFERENCE_BASE_HPP_INCLUDE_GUARD_
00038 #define BLOCXX_REFERENCE_BASE_HPP_INCLUDE_GUARD_
00039 #include "blocxx/BLOCXX_config.h"
00040 #include "blocxx/RefCount.hpp"
00041 
00042 // The classes and functions defined in this file are not meant for general
00043 // use, they are internal implementation details.  They may change at any time.
00044 
00045 namespace BLOCXX_NAMESPACE
00046 {
00047 
00049 template<class T>
00050 inline void RefSwap(T& x, T&y)
00051 {
00052    T t = x;
00053    x = y;
00054    y = t;
00055 }
00057 // This class contains the non-templated code for Reference, to help 
00058 // minimize code bloat.
00059 class BLOCXX_COMMON_API ReferenceBase
00060 {
00061 #if !defined(__GNUC__) || __GNUC__ > 2 // because of a gcc 2.95 ICE
00062 protected:
00063 #else
00064 public:
00065 #endif
00066    ReferenceBase()
00067       : m_pRefCount(new RefCount) {}
00068    ReferenceBase(const ReferenceBase& arg)
00069       : m_pRefCount(0)
00070    {
00071       m_pRefCount = arg.m_pRefCount;
00072       m_pRefCount->inc();
00073    }
00074    void incRef()
00075    {
00076       m_pRefCount->inc();
00077    }
00078    
00079    bool decRef()
00080    {
00081       if (m_pRefCount->decAndTest())
00082       {
00083          delete m_pRefCount;
00084          return true;
00085       }
00086       return false;
00087    }
00088    void swap(ReferenceBase& arg)
00089    {
00090       RefSwap(m_pRefCount, arg.m_pRefCount);
00091    }
00092    void useRefCountOf(const ReferenceBase& arg)
00093    {
00094       decRef();
00095       m_pRefCount = arg.m_pRefCount;
00096       incRef();
00097    }
00098    
00099 #ifdef BLOCXX_CHECK_NULL_REFERENCES
00100    static void throwNULLException();
00101    static void checkNull(const void *p)
00102    {
00103       if (p == 0)
00104       {
00105          throwNULLException();
00106       }
00107    }
00108 #endif
00109 
00110 #if !defined(__GNUC__) || __GNUC__ > 2 // because of a gcc 2.95 ICE
00111 protected:
00112 #else
00113 public:
00114 #endif
00115    RefCount* volatile m_pRefCount;
00116 };
00117 
00118 } // end namespace BLOCXX_NAMESPACE
00119 
00120 #endif
00121 

Generated on Fri Jun 16 15:39:08 2006 for blocxx by  doxygen 1.4.6