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refBase.h
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1 //
2 // Copyright 2016 Pixar
3 //
4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
6 // compliance with the Apache License and the following modification to it:
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24 #ifndef PXR_BASE_TF_REF_BASE_H
25 #define PXR_BASE_TF_REF_BASE_H
26 
29 
30 #include "pxr/pxr.h"
31 
32 #include "pxr/base/tf/refCount.h"
33 #include "pxr/base/tf/api.h"
34 
35 PXR_NAMESPACE_OPEN_SCOPE
36 
37 template <class T> class TfRefPtr;
38 template <class T> class TfWeakPtr;
39 
71 class TfRefBase {
72 public:
73 
74  typedef void (*UniqueChangedFuncPtr)(TfRefBase const *, bool);
75  struct UniqueChangedListener {
76  void (*lock)();
77  UniqueChangedFuncPtr func;
78  void (*unlock)();
79  };
80 
81  TfRefBase() : _shouldInvokeUniqueChangedListener(false) { }
82 
84  size_t GetCurrentCount() const {
85  return GetRefCount().Get();
86  }
87 
89  bool IsUnique() const {
90  return GetRefCount().Get() == 1;
91  }
92 
93  const TfRefCount& GetRefCount() const {
94  return _refCount;
95  }
96 
97  void SetShouldInvokeUniqueChangedListener(bool shouldCall) {
98  _shouldInvokeUniqueChangedListener = shouldCall;
99  }
100 
101  TF_API static void SetUniqueChangedListener(UniqueChangedListener listener);
102 
103 protected:
104  /*
105  * Prohibit deletion through a TfRefBase pointer.
106  */
107  TF_API virtual ~TfRefBase();
108 
109 private:
110  TfRefCount _refCount;
111  bool _shouldInvokeUniqueChangedListener;
112 
113  static UniqueChangedListener _uniqueChangedListener;
114  template <typename T> friend class TfRefPtr;
115  friend struct Tf_RefPtr_UniqueChangedCounter;
116  friend struct Tf_RefPtr_Counter;
117 
118  template <typename T> friend TfRefPtr<T>
120 };
121 
131 class TfSimpleRefBase : public TfRefBase {
132 public:
133  TF_API virtual ~TfSimpleRefBase();
134 };
135 
136 PXR_NAMESPACE_CLOSE_SCOPE
137 
138 #endif // PXR_BASE_TF_REF_BASE_H
int Get() const
Returns counter&#39;s value.
Definition: refCount.h:85
friend TfRefPtr< T > TfCreateRefPtrFromProtectedWeakPtr(TfWeakPtr< T > const &)
Thread-safe creation of a Tf ref pointer from a Tf weak pointer.
Definition: weakPtr.h:262
Reference counter class.
Definition: refCount.h:71
size_t GetCurrentCount() const
Return the current reference count of this object.
Definition: refBase.h:84
Pointer storage with deletion detection.
Definition: hash.h:44
Enable a concrete base class for use with TfRefPtr.
Definition: refBase.h:71
Enable a concrete base class for use with TfRefPtr that inhibits the &quot;unique changed&quot; facility of TfR...
Definition: refBase.h:131
bool IsUnique() const
Return true if only one TfRefPtr points to this object.
Definition: refBase.h:89
Reference-counted smart pointer utility class.
Definition: hash.h:45