Contents

• Public Functions
• Detailed Description

Detailed Description

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 fromQtConcurrent::Exception and implement two helper functions:

class MyException :publicQtConcurrent::Exception{public:void raise()const {throw*this; }    Exception*clone()const {returnnew 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 ofQtConcurrent::Exception, the Qt Concurrent functions will throw aQtConcurrent::UnhandledException in the receiver thread.

When usingQFuture, transferred exceptions will be thrown when calling the following functions:

• QFuture::waitForFinished()
• QFuture::result()
• QFuture::resultAt()
• QFuture::results()

Member Function Documentation

[virtual]Exception * Exception::clone() const

In yourQtConcurrent::Exception subclass, reimplement clone() like this:

MyException*MyException::clone()const {returnnew MyException(*this); }

[virtual]void Exception::raise() const

In yourQtConcurrent::Exception subclass, reimplement raise() like this:

void MyException::raise()const {throw*this; }