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The Exception class provides a base class for exceptions that can transferred across threads. More...
#include <QtCore>
Inherited by QtConcurrent::UnhandledException.
This class was introduced in Qt 4.4.
| virtual Exception * | clone () const | 
| virtual void | raise () const | 
The Exception class provides a base class for exceptions that can transferred across threads.
Qt Concurrent supports throwing and catching exceptions across thread boundaries, provided that the exception inherit from QtConcurrent::Exception and implement two helper functions:
 class MyException : public QtConcurrent::Exception
 {
 public:
     void raise() const { throw *this; }
     Exception *clone() const { return new MyException(*this); }
 };
QtConcurrent::Exception subclasses must be thrown by value and caught by reference:
 try  {
     QtConcurrent::blockingMap(list, throwFunction); // throwFunction throws MyException
 } catch (MyException &e) {
     // handle exception
 }
If you throw an exception that is not a subclass of QtConcurrent::Exception, the Qt Concurrent functions will throw a QtConcurrent::UnhandledException in the receiver thread.
When using QFuture, transferred exceptions willl be thrown when calling the following functions:
In your QtConcurrent::Exception subclass, reimplement clone() like this:
 MyException *MyException::clone() const { return new MyException(*this); }
In your QtConcurrent::Exception subclass, reimplement raise() like this:
 void MyException::raise() const { throw *this; }
| Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies) | Trademarks | Qt 4.6.3 |