blocxx
SharedLibraryReference.hpp
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32
33
37
38#ifndef BLOCXX_SHARED_LIBRARY_REFERENCE_HPP_
39#define BLOCXX_SHARED_LIBRARY_REFERENCE_HPP_
40#include "blocxx/BLOCXX_config.h"
42
43namespace BLOCXX_NAMESPACE
44{
45
46template <class T>
48{
49public:
50 typedef T element_type;
51
52 SharedLibraryReference(const SharedLibraryRef& lib, const T& obj)
53 : m_sharedLib(lib), m_obj(obj)
54 {}
55 SharedLibraryReference(const SharedLibraryRef& lib, typename T::element_type* obj)
56 : m_sharedLib(lib), m_obj(T(obj))
57 {}
62 /* construct out of a reference to a derived type. U should be
63 derived from T */
64 template <class U>
73 {
74 m_obj = arg.m_obj;
76 return *this;
77 }
79 {
80 try
81 {
82 m_obj = 0;
83 m_sharedLib = 0;
84 }
85 catch (...)
86 {
87 // don't let exceptions escape
88 }
89 }
91 {
92 return m_sharedLib;
93 }
94 typename T::element_type* operator->() const
95 {
96 return &*m_obj;
97 }
98 T get() const
99 {
100 return m_obj;
101 }
102
104 operator safe_bool () const
105 { return (m_obj) ? &SharedLibraryReference::m_obj : 0; }
106 bool operator!() const
107 { return !m_obj; }
108 void setNull()
109 {
110 m_obj = 0;
111 m_sharedLib = 0;
112 }
113
114 template <class U>
116 {
119 rval.m_obj = m_obj.cast_to<U>();
120 return rval;
121 }
122
123 BLOCXX_DEPRECATED bool isNull() const // in 3.1.0
124 {
125 return !m_obj;
126 }
127
128#if !defined(__GNUC__) || __GNUC__ > 2 // causes gcc 2.95 to ICE
129 /* This is so cast_to will work */
130 template <class U> friend class SharedLibraryReference;
131
132private:
133#endif
134
137};
138
139} // end namespace BLOCXX_NAMESPACE
140
141#endif
SharedLibraryReference(const SharedLibraryReference< T > &arg)
SharedLibraryReference(const SharedLibraryRef &lib, typename T::element_type *obj)
SharedLibraryReference(const SharedLibraryReference< U > &arg)
SharedLibraryReference< T > & operator=(const SharedLibraryReference< T > &arg)
SharedLibraryReference< U > cast_to() const
SharedLibraryReference(const SharedLibraryRef &lib, const T &obj)
Taken from RFC 1321.
IntrusiveReference< SharedLibrary > SharedLibraryRef