[Qt5-feedback] Better support for asynchronous code

[Peter Kümmel]

On 05.06.2011 13:08, olivier.goffart at nokia.com wrote:
> Hi,
>
> There is Qt Concurrent and QFuture.  Those would benefit from some work.
>
> We have plans to support the C++0x lambda expressions, that might help to keep the asynchronous code in-place.

Yes, lambda will help alot, especially if it could be used in connections and in the state-machine framework.

Peter

>
> There is also the KJob API that is really great for some asynchronous operations.
> http://api.kde.org/4.x-api/kdelibs-apidocs/kdecore/html/classKJob.html
>
> ________________________________________
> Fra: qt5-feedback-bounces+olivier.goffart=nokia.com at qt.nokia.com [qt5-feedback-bounces+olivier.goffart=nokia.com at qt.nokia.com] på vegne av ext Peter Kümmel [syntheticpp at gmx.net]
> Sendt: 5. juni 2011 11:56
> Til: qt5-feedback at qt.nokia.com
> Emne: [Qt5-feedback] Better support for asynchronous code
>
> Very often it is needed to write asynchronous code
> (eg. when networking). Qt provides all necessary
> low level stuff: signal, slots, threads,
> queued connections.
>
> But the code which implements the asynchronous behavior
> is less readable than the code of a synchronous control
> flow: Lot of small functions (the slots), several threads,
> signals, connections.
>
> This way the risk is high to end up with a modern form of
> "Spaghetti Code". In case of Qt I would call it the
> "Signal Slot Massacre". (Could eventually be avoided by using
> a state machine)
>
> What I like to see in Qt5 is better support to produce
> readable asynchronous code.
>
> Maybe other languages (Erlang, Objective-C, Scala, ...) or
> libraries (Grand Central Dispatch, Threading Building Blocks)
> could inspire solutions which make Qt/C++ better prepared
> for asynchronous program flows.
>
> Once I added a more comfortable syntax for message passing to QObjects:
> http://lists.qt.nokia.com/pipermail/qt-interest/2009-September/012633.html
>
> But I think there are many other ways to improve Qt/C++ at this topic.
>
> Peter
>
>
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>