[Interest] QFuture, QAsync? Coroutines, Generators, Promises, Futures...

[Ben Lau]

On 28 December 2016 at 05:50, Petar Koretić <petar.koretic at gmail.com> wrote:

> Hi all!
>
> In the wild people are doing all kinds of different things with Qt on the
> network side. And there are some obvious issues with that given the
> "callback" nature of Qt networking code.
>
> One can see different examples of people over the years dealing with that:
>
> http://cukic.co/2016/01/17/asynqt-framework-making-qfuture-useful
> https://github.com/KDE/kasync
> http://qasync.henrikhedberg.com
> https://github.com/mhogomchungu/tasks
> https://gist.github.com/legnaleurc/1038309
>
> Since we are also using Qt a lot on the server side I'm curious what is
> the progress from the Qt side on that given that coroutines will come to
> C++ (http://en.cppreference.com/w/cpp/experimental)
>
> We were using Boost and as we were using Qt for clients decided we could
> also do server parts in Qt as well. This is all fine and I enjoyed it, but
> boost has futures, promises and coroutines as well, which is nice, since we
> also have backends in Node.js where we employ identical patterns.
>
> So I've been waiting for 2 years now to see what will come up from Qt and
> I don't see much about that changing. Heck, QAsync tackled this in 2011.
> Will Qt "embrace" coroutines from standard? Will they come up with
> something of their own? Should we abandon Qt for networking? Should we use
> something of our own?
>
> One possible way currently is to use QtConcurrent (badly I guess) and wrap
> everything into QtConcurrent::run, which, for example, for QNetworkRequest
> means first converting it to sync code using local event loop which is
> again not recommended.
>
>
Why you think it is not recommended?


> I expect that everybody is up to date and know about
> callbacks/coroutines/futures/promises/generators these days but for
> others here are some examples that explain it better than I can:
>
> http://www.boost.org/doc/libs/1_63_0/libs/coroutine2/doc/
> html/coroutine2/motivation.html
> https://msdn.microsoft.com/en-us/magazine/mt573711.aspx
> https://blogs.msdn.microsoft.com/vcblog/2016/04/04/using-c-
> coroutines-to-simplify-async-uwp-code
>
> Thanks,
> Petar
>
>
For coroutines, any recommended implementation that is easy to be installed
on all supported platforms by Qt?
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