Qt 4.8
qtconcurrentrunbase.h
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41 
42 #ifndef QTCONCURRENT_RUNBASE_H
43 #define QTCONCURRENT_RUNBASE_H
44 
45 #include <QtCore/qglobal.h>
46 
47 #ifndef QT_NO_CONCURRENT
48 
49 #include <QtCore/qfuture.h>
50 #include <QtCore/qrunnable.h>
51 #include <QtCore/qthreadpool.h>
52 
55 
56 QT_MODULE(Core)
57 
58 #ifndef qdoc
59 
60 namespace QtConcurrent {
61 
62 template <typename T>
63 struct SelectSpecialization
64 {
65  template <class Normal, class Void>
66  struct Type { typedef Normal type; };
67 };
68 
69 template <>
70 struct SelectSpecialization<void>
71 {
72  template <class Normal, class Void>
73  struct Type { typedef Void type; };
74 };
75 
76 template <typename T>
77 class RunFunctionTaskBase : public QFutureInterface<T> , public QRunnable
78 {
79 public:
80  QFuture<T> start()
81  {
82  this->setRunnable(this);
83  this->reportStarted();
84  QFuture<T> future = this->future();
85  QThreadPool::globalInstance()->start(this, /*m_priority*/ 0);
86  return future;
87  }
88 
89  void run() {}
90  virtual void runFunctor() = 0;
91 };
92 
93 template <typename T>
94 class RunFunctionTask : public RunFunctionTaskBase<T>
95 {
96 public:
97  void run()
98  {
99  if (this->isCanceled()) {
100  this->reportFinished();
101  return;
102  }
103 #ifndef QT_NO_EXCEPTIONS
104  try {
105 #endif
106  this->runFunctor();
107 #ifndef QT_NO_EXCEPTIONS
108  } catch (QtConcurrent::Exception &e) {
110  } catch (...) {
112  }
113 #endif
114 
115  this->reportResult(result);
116  this->reportFinished();
117  }
118  T result;
119 };
120 
121 template <>
122 class RunFunctionTask<void> : public RunFunctionTaskBase<void>
123 {
124 public:
125  void run()
126  {
127  if (this->isCanceled()) {
128  this->reportFinished();
129  return;
130  }
131 #ifndef QT_NO_EXCEPTIONS
132  try {
133 #endif
134  this->runFunctor();
135 #ifndef QT_NO_EXCEPTIONS
136  } catch (QtConcurrent::Exception &e) {
138  } catch (...) {
140  }
141 #endif
142  this->reportFinished();
143  }
144 };
145 
146 } //namespace QtConcurrent
147 
148 #endif //qdoc
149 
152 
153 #endif // QT_NO_CONCURRENT
154 
155 #endif
int type
Definition: qmetatype.cpp:239
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
#define QT_MODULE(x)
Definition: qglobal.h:2783
#define QT_BEGIN_HEADER
Definition: qglobal.h:136
The UnhandledException class represents an unhandled exception in a worker thread.
The QRunnable class is the base class for all runnable objects.
Definition: qrunnable.h:52
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
void start(QRunnable *runnable, int priority=0)
Reserves a thread and uses it to run runnable, unless this thread will make the current thread count ...
void reportException(const QtConcurrent::Exception &e)
The QFuture class represents the result of an asynchronous computation.
Definition: qfuture.h:64
The Exception class provides a base class for exceptions that can transferred across threads...
The QtConcurrent namespace provides high-level APIs that make it possible to write multi-threaded pro...
static QThreadPool * globalInstance()
Returns the global QThreadPool instance.
QFuture< T > run(Function function,...)
#define QT_END_HEADER
Definition: qglobal.h:137