GL Studio API
weak_referenceable_mixin.h
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1 /*! \file
2  \brief weak reference and related classes
3 
4  \par Copyright Information
5 
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39 */
40 #ifndef INCLUDED_WEAK_REFERENCEABLE_MIXIN_H
41 #define INCLUDED_WEAK_REFERENCEABLE_MIXIN_H
42 
43 #include "weak_reference.h"
44 #include "dynamic_array.h"
45 #include "gls_cpp_lang_support.h"
46 
47 namespace disti
48 {
49  /** utility helper mixin class for simplifying implementing WeakReferenceable.
50  * Classes that want to implement WeakReferenceable can simply inherit this class
51  */
53  {
54  public:
55  /** \see WeakReferenceable */
56  void AddWeakReference( WeakReference* weakRef ) DISTI_METHOD_OVERRIDE
57  {
58  // reduce storage by only allocating the dynamic array when asked for a weak reference
59  if( !_weakRefs )
60  {
62  }
63 
64  // store the weak reference so we can notify it when we are deleted
65  _weakRefs->InsertObject( weakRef );
66  }
67 
68  /** \see WeakReferenceable */
69  void NotifyWeakReferenceDestroyed( WeakReference* ref ) DISTI_METHOD_OVERRIDE
70  {
71  // When a weak reference is deleted, remove it from our list so that we don't call a method on a deleted object
72  // in our destructor
73  if( _weakRefs )
74  {
75  for( unsigned int index = 0u; index < _weakRefs->Count(); ++index )
76  {
77  if( ref == (*_weakRefs)[index] )
78  {
79  _weakRefs->DeleteObjectAtIndex( index );
80  return;
81  }
82  }
83  }
84  }
85 
86  protected:
87  /** constructor */
89  : _weakRefs( NULL )
90  {
91  }
92 
93  /** destructor. Notifies all weak references that this object is being deleted */
95  {
96  if( _weakRefs )
97  {
98  for( unsigned int index = 0u; index < _weakRefs->Count(); ++index )
99  {
100  (*_weakRefs)[index]->NotifyReferentDestroyed();
101  }
102 
103  delete _weakRefs;
104  _weakRefs = NULL;
105  }
106 
107  }
108 
109  /** pointer to array of weak refs. Allocated on the first call to GetWeakReference() */
111  };
112 
113 } // namespace disti
114 
115 #endif
void NotifyWeakReferenceDestroyed(WeakReference *ref)
Definition: weak_referenceable_mixin.h:69
Definition: dynamic_array.h:63
The disti::DynamicArray class. A templated array of objects capable of dynamically growing...
void AddWeakReference(WeakReference *weakRef)
Definition: weak_referenceable_mixin.h:56
Definition: weak_reference.h:51
Definition: weak_reference.h:64
virtual ~WeakReferenceableMixin()
Definition: weak_referenceable_mixin.h:94
Definition: weak_referenceable_mixin.h:52
WeakReferenceableMixin(void)
Definition: weak_referenceable_mixin.h:88
DynamicArray< WeakReference * > * _weakRefs
Definition: weak_referenceable_mixin.h:110
Macros and helper code to determine what subset of C++11/14/17 is available.
Definition: bmpimage.h:46
weak reference and related classes