00001 #ifndef DCHAIN_REFERENCECOUNT_H 00002 #define DCHAIN_REFERENCECOUNT_H 00003 // -*- C++ -*- 00004 // 00005 // Package: DChain 00006 // Module: ReferenceCount 00007 // 00008 // Description: Base class for classes that need reference counting 00009 // 00010 // Usage: 00011 // ReferenceCount() - default constructor 00012 // ~ReferenceCount() - destructor 00013 // addLink() - record that another object points to this object 00014 // dropLink() - record that an object no longer points to this object 00015 // 00016 // Author: Simon Patton 00017 // Created: Fri May 17 08:01:51 EDT 1996 00018 // $Id: ReferenceCount.h,v 1.1.1.1 2009/03/03 06:06:56 maqm Exp $ 00019 // 00020 // Revision history 00021 // 00022 // $Log: ReferenceCount.h,v $ 00023 // Revision 1.1.1.1 2009/03/03 06:06:56 maqm 00024 // first import of DecayChain 00025 // 00026 // Revision 1.1 2006/01/11 20:28:09 cdj 00027 // massive class renaming, addition of [] for selection and unit tests 00028 // 00029 // Revision 1.4 2004/05/12 20:12:52 ryd 00030 // Added missing #include 00031 // 00032 // Revision 1.3 2004/05/11 02:39:17 ryd 00033 // Change reference count to UInt32 and throw exception if count exceeds maximum 00034 // 00035 // Revision 1.2 2003/05/15 19:56:01 cdj 00036 // revamped memory handling so always use a ReferenceHolder to deal with the reference counting 00037 // 00038 // Revision 1.1.1.1 2000/12/18 22:16:49 cdj 00039 // imported DChain 00040 // 00041 // Revision 1.2 1998/08/21 00:46:09 sjp 00042 // removed unnecessary include 00043 // 00044 // Revision 1.1 1998/08/19 20:56:46 sjp 00045 // New heder for reference counting class 00046 // 00047 // Revision 1.1 1998/08/17 23:59:22 sjp 00048 // New file to make libraries standalone 00049 // 00050 00051 // system include files 00052 #include <stdint.h> 00053 00054 // user include files 00055 //#include "DecayChain/util/DAException.h" 00056 00057 // forward declarations 00058 namespace dchain { 00059 00060 /* 00061 class TooManyReferencesException : public DAException 00062 { 00063 public: 00064 TooManyReferencesException():DAException("Too many references to object in a DChain list.\n check sizes of list that you multiply."){} 00065 }; 00066 */ 00067 00068 00069 class ReferenceCount 00070 { 00071 public: 00072 // Constructors and destructor 00073 ReferenceCount(); 00074 virtual ~ReferenceCount() {} 00075 00076 // const member functions 00077 void addLink() const ; 00078 void dropLink() const ; 00079 00080 private: 00081 // Constructors and destructor 00082 ReferenceCount( const ReferenceCount& ) ; // stop default 00083 00084 // assignment operator(s) 00085 const ReferenceCount& operator=( const ReferenceCount& ) ; // stop default 00086 00087 // data members 00088 mutable uint32_t m_linkCount ; 00089 00090 }; 00091 00092 // inline function definitions 00093 00094 // 00095 // constructors and destructor 00096 // 00097 00098 inline ReferenceCount::ReferenceCount() : 00099 m_linkCount( 0 ) 00100 { 00101 } 00102 00103 // 00104 // member functions 00105 // 00106 00107 inline void ReferenceCount::addLink() const 00108 { 00109 //if (m_linkCount==0xFFFFFFFF) { 00110 // throw TooManyReferencesException(); 00111 //} 00112 ++m_linkCount ; 00113 } 00114 00115 inline void ReferenceCount::dropLink() const 00116 { 00117 --m_linkCount ; 00118 if ( 0 == m_linkCount ) { 00119 // It is necessary to throw away the 'const' so that the object 00120 // can be deleted 00121 delete const_cast<ReferenceCount*>(this) ; 00122 } 00123 } 00124 } 00125 #endif // DCHAIN_REFERENCECOUNT_H
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