c++20 <coroutine> generators for boost beast

[LoganGoh]

I am starting work on a new c++20 project that uses boost beast websocket and http. I would like to use async with coroutines, similar to how async/await works in Python and Rust. However there are a lot of different coroutine implementations for c++, and I would like some advice on which one I should use with beast.

Are there currently any plans for beast to support c++20 coroutines, and has work already started on any experimental c++20 coroutine generators for beast? I know how to write my own, but if somebody else is already working on it I would like to make use of it and perhaps make some contributions, instead of redoing what has already been done. I think it would be good to have an async generator for messages being received over the websocket, possibly also implemented as an infinite sequence that supports std::ranges?

On the other hand perhaps c++20 coroutines are still too new, and I should stick with boost coroutines? I see from the http client coro_ssl example that beast is using boost coroutines instead of coroutines2. Should I stick with boost coroutines even though it has been deprecated, or should I use boost coroutines2 instead?

[madmongo1]

If you have C++20 and recent compiler suite, I'd be happy to recommend C++20 coroutines. The asio::awaitable support is pretty good and is well maintained.

e.g.:

auto result = co_await object.async_something(asio::use_awaitable);

You can write generators, or you can use the asio::experimental::channel as a rendezvous point for multiple streams of events. asio::steady_timer also makes the basis of an efficient asynchronous semaphore, whichever coroutine system you choose.

If you have older tooling, then you may want to consider boost::coroutine.

[LoganGoh]

Thank you, yes. I am using c++20 and recent gcc. Is there any good example code for how to connect as a websocket client using asio:awaitable and beast? I looked at the example directory in the master branch and the coro example in there is I believe 3 years old and using boost::coroutine?

[madmongo1]

Here is something I wrote some months ago in both C++17 and C++20

https://github.com/test-scenarios/boost_beast_websocket_echo

I am available most days on the CPPLang slack in the #beast channel.

https://cppalliance.org/slack/

[klemens-morgenstern]

Is this resolved?

[LoganGoh]

Yes, you can close it please

On Wed, 31 Aug 2022, 9:31 am Klemens Morgenstern, @.***> wrote:

Is this resolved?

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