Exception Class

The Exception class provides a base class for exceptions that can transferred across threads. 更多...

头：	#include <Exception>
Since:	Qt 4.4
继承：
继承者：	QtConcurrent::UnhandledException

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公共函数

virtual Exception *	clone () const
virtual void	raise () const

详细描述

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.

当使用 QFuture , transferred exceptions will be thrown when calling the following functions:

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`[虚拟]` Exception * Exception:: clone () const

在 QtConcurrent::Exception 子类，重实现 clone() 像这样：

MyException *MyException::clone() const { return new MyException(*this); }

`[虚拟]` void Exception:: raise () const

在 QtConcurrent::Exception 子类，重实现 raise() 像这样：

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

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