00001 /******************************************************************************* 00002 * Copyright (C) 2003-2004 Vintela, Inc. All rights reserved. 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions are met: 00006 * 00007 * - Redistributions of source code must retain the above copyright notice, 00008 * this list of conditions and the following disclaimer. 00009 * 00010 * - Redistributions in binary form must reproduce the above copyright notice, 00011 * this list of conditions and the following disclaimer in the documentation 00012 * and/or other materials provided with the distribution. 00013 * 00014 * - Neither the name of Vintela, Inc. nor the names of its 00015 * contributors may be used to endorse or promote products derived from this 00016 * software without specific prior written permission. 00017 * 00018 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 00019 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00020 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00021 * ARE DISCLAIMED. IN NO EVENT SHALL Vintela, Inc. OR THE CONTRIBUTORS 00022 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00023 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00024 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00025 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00026 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00027 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00028 * POSSIBILITY OF SUCH DAMAGE. 00029 *******************************************************************************/ 00030 00035 #ifndef OW_REFERENCE_BASE_HPP_INCLUDE_GUARD_ 00036 #define OW_REFERENCE_BASE_HPP_INCLUDE_GUARD_ 00037 #include "OW_config.h" 00038 #include "OW_RefCount.hpp" 00039 00040 // The classes and functions defined in this file are not meant for general 00041 // use, they are internal implementation details. They may change at any time. 00042 00043 namespace OW_NAMESPACE 00044 { 00045 00047 template<class T> 00048 inline void RefSwap(T& x, T&y) 00049 { 00050 T t = x; 00051 x = y; 00052 y = t; 00053 } 00055 // This class contains the non-templated code for Reference, to help 00056 // minimize code bloat. 00057 class OW_COMMON_API ReferenceBase 00058 { 00059 #if !defined(__GNUC__) || __GNUC__ > 2 // because of a gcc 2.95 ICE 00060 protected: 00061 #else 00062 public: 00063 #endif 00064 ReferenceBase() 00065 : m_pRefCount(new RefCount) {} 00066 ReferenceBase(const ReferenceBase& arg) 00067 : m_pRefCount(0) 00068 { 00069 m_pRefCount = arg.m_pRefCount; 00070 m_pRefCount->inc(); 00071 } 00072 void incRef() 00073 { 00074 m_pRefCount->inc(); 00075 } 00076 00077 bool decRef() 00078 { 00079 if (m_pRefCount->decAndTest()) 00080 { 00081 delete m_pRefCount; 00082 return true; 00083 } 00084 return false; 00085 } 00086 void swap(ReferenceBase& arg) 00087 { 00088 RefSwap(m_pRefCount, arg.m_pRefCount); 00089 } 00090 void useRefCountOf(const ReferenceBase& arg) 00091 { 00092 decRef(); 00093 m_pRefCount = arg.m_pRefCount; 00094 incRef(); 00095 } 00096 00097 #ifdef OW_CHECK_NULL_REFERENCES 00098 static void throwNULLException(); 00099 static void checkNull(const void *p) 00100 { 00101 if (p == 0) 00102 { 00103 throwNULLException(); 00104 } 00105 } 00106 #endif 00107 00108 #if !defined(__GNUC__) || __GNUC__ > 2 // because of a gcc 2.95 ICE 00109 protected: 00110 #else 00111 public: 00112 #endif 00113 RefCount* volatile m_pRefCount; 00114 }; 00115 00116 } // end namespace OW_NAMESPACE 00117 00118 #endif 00119