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shared-object.hpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2017
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37 
38 namespace Gecode {
39 
50  class SharedHandle {
51  public:
58  friend class SharedHandle;
59  private:
62  public:
64  Object(void);
66  virtual ~Object(void);
67  };
68  private:
70  Object* o;
72  void subscribe(void);
74  void cancel(void);
75  public:
77  SharedHandle(void);
81  SharedHandle(const SharedHandle& sh);
85  ~SharedHandle(void);
87  operator bool(void) const;
88  protected:
90  SharedHandle::Object* object(void) const;
93  };
94 
95 
98  : rc(0) {}
101  assert(!rc);
102  }
103 
104 
106  SharedHandle::object(void) const {
107  return o;
108  }
109  forceinline void
111  if (o != nullptr) o->rc.inc();
112  }
113  forceinline void
114  SharedHandle::cancel(void) {
115  if ((o != nullptr) && o->rc.dec())
116  delete o;
117  o=nullptr;
118  }
119  forceinline void
121  if (n != o) {
122  cancel(); o=n; subscribe();
123  }
124  }
126  SharedHandle::SharedHandle(void) : o(nullptr) {}
129  subscribe();
130  }
133  subscribe();
134  }
137  if (&sh != this) {
138  cancel(); o=sh.o; subscribe();
139  }
140  return *this;
141  }
143  SharedHandle::operator bool(void) const {
144  return o != nullptr;
145  }
148  cancel();
149  }
150 
151 }
152 
153 // STATISTICS: kernel-memory
SharedHandle(void)
Create shared handle with no object pointing to.
The shared handle.
void cancel(Space &home, Propagator &p, IntSet &y)
Definition: rel.hpp:85
#define forceinline
Definition: config.hpp:182
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
SharedHandle::Object * object(void) const
Access to the shared object.
void subscribe(Space &home, Propagator &p, IntSet &y)
Definition: rel.hpp:75
SharedHandle & operator=(const SharedHandle &sh)
Assignment operator maintaining reference count.
#define GECODE_KERNEL_EXPORT
Definition: kernel.hh:74
~SharedHandle(void)
Destructor that maintains reference count.
virtual ~Object(void)
Delete shared object.
A class for thread-safe reference counting.
Definition: ref-count.hpp:43
Gecode toplevel namespace
Base class for heap allocated objects.
Definition: heap.hpp:344