The Exception class provides a base class for exceptions that can transferred across threads. More...
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 will 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; }