blocxx
ReferenceBase.hpp
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32 
33 
38 #ifndef BLOCXX_REFERENCE_BASE_HPP_INCLUDE_GUARD_
39 #define BLOCXX_REFERENCE_BASE_HPP_INCLUDE_GUARD_
40 #include "blocxx/BLOCXX_config.h"
41 #include "blocxx/RefCount.hpp"
42 
43 // The classes and functions defined in this file are not meant for general
44 // use, they are internal implementation details. They may change at any time.
45 
46 namespace BLOCXX_NAMESPACE
47 {
48 
50 template<class T>
51 inline void RefSwap(T& x, T&y)
52 {
53  T t = x;
54  x = y;
55  y = t;
56 }
58 // This class contains the non-templated code for Reference, to help
59 // minimize code bloat.
60 class BLOCXX_COMMON_API ReferenceBase
61 {
62 #if !defined(__GNUC__) || __GNUC__ > 2 // because of a gcc 2.95 ICE
63 protected:
64 #else
65 public:
66 #endif
67  ReferenceBase()
68  : m_pRefCount(new RefCount) {}
69  ReferenceBase(const ReferenceBase& arg)
70  : m_pRefCount(0)
71  {
72  m_pRefCount = arg.m_pRefCount;
73  m_pRefCount->inc();
74  }
75  void incRef()
76  {
77  m_pRefCount->inc();
78  }
79 
80  bool decRef()
81  {
82  if (m_pRefCount->decAndTest())
83  {
84  delete m_pRefCount;
85  return true;
86  }
87  return false;
88  }
89  void swap(ReferenceBase& arg)
90  {
91  RefSwap(m_pRefCount, arg.m_pRefCount);
92  }
93  void useRefCountOf(const ReferenceBase& arg)
94  {
95  decRef();
96  m_pRefCount = arg.m_pRefCount;
97  incRef();
98  }
99 
100 #if !defined(__GNUC__) || __GNUC__ > 2 // because of a gcc 2.95 ICE
101 protected:
102 #else
103 public:
104 #endif
105  RefCount* volatile m_pRefCount;
106 };
107 
108 } // end namespace BLOCXX_NAMESPACE
109 
110 #endif
111 
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