VTK  9.0.2
vtkSMPThreadLocalObject.h
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1 /*=========================================================================
2 
3  Program: Visualization Toolkit
4  Module: vtkSMPThreadLocalObject.h
5 
6  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7  All rights reserved.
8  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9 
10  This software is distributed WITHOUT ANY WARRANTY; without even
11  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12  PURPOSE. See the above copyright notice for more information.
13 
14 =========================================================================*/
74 #ifndef vtkSMPThreadLocalObject_h
75 #define vtkSMPThreadLocalObject_h
76 
77 #include "vtkSMPThreadLocal.h"
78 
79 template <typename T>
81 {
82  typedef vtkSMPThreadLocal<T*> TLS;
83  typedef typename vtkSMPThreadLocal<T*>::iterator TLSIter;
84 
85  // Hide the copy constructor for now and assignment
86  // operator for now.
88  void operator=(const vtkSMPThreadLocalObject&);
89 
90 public:
95  : Internal(nullptr)
96  , Exemplar(nullptr)
97  {
98  }
99 
100  vtkSMPThreadLocalObject(T* const& exemplar)
101  : Internal(0)
102  , Exemplar(exemplar)
103  {
104  }
105 
107  {
108  iterator iter = this->begin();
109  while (iter != this->end())
110  {
111  if (*iter)
112  {
113  (*iter)->Delete();
114  }
115  ++iter;
116  }
117  }
118 
120 
125  T*& Local()
126  {
127  T*& vtkobject = this->Internal.Local();
128  if (!vtkobject)
129  {
130  if (this->Exemplar)
131  {
132  vtkobject = this->Exemplar->NewInstance();
133  }
134  else
135  {
136  vtkobject = T::SafeDownCast(T::New());
137  }
138  }
139  return vtkobject;
140  }
142 
146  size_t size() const { return this->Internal.size(); }
147 
149 
155  class iterator
156  {
157  public:
159  {
160  ++this->Iter;
161  return *this;
162  }
164 
166  {
167  iterator copy = *this;
168  ++this->Iter;
169  return copy;
170  }
171 
172  bool operator==(const iterator& other) { return this->Iter == other.Iter; }
173 
174  bool operator!=(const iterator& other) { return this->Iter != other.Iter; }
175 
176  T*& operator*() { return *this->Iter; }
177 
178  T** operator->() { return &*this->Iter; }
179 
180  private:
181  TLSIter Iter;
182 
183  friend class vtkSMPThreadLocalObject<T>;
184  };
185 
187  {
188  iterator iter;
189  iter.Iter = this->Internal.begin();
190  return iter;
191  };
192 
194  {
195  iterator iter;
196  iter.Iter = this->Internal.end();
197  return iter;
198  }
199 
200 private:
201  TLS Internal;
202  T* Exemplar;
203 };
204 
205 #endif
206 // VTK-HeaderTest-Exclude: vtkSMPThreadLocalObject.h
Subset of the standard iterator API.
bool operator!=(const iterator &other)
bool operator==(const iterator &other)
Thread local storage for VTK objects.
size_t size() const
Return the number of thread local objects that have been initialized.
vtkSMPThreadLocalObject(T *const &exemplar)
T *& Local()
Returns an object local to the current thread.
vtkSMPThreadLocalObject()
Default constructor.