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Groups > comp.lang.c++ > #81555
| From | "Alf P. Steinbach" <alf.p.steinbach@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: "C++20 Coroutines" by Martin Bond |
| Date | 2021-09-25 15:14 +0200 |
| Organization | A noiseless patient Spider |
| Message-ID | <sin7c5$c9d$1@dont-email.me> (permalink) |
| References | <siauhc$mg6$1@dont-email.me> |
On 20 Sep 2021 23:30, Lynn McGuire wrote: > "C++20 Coroutines" by Martin Bond > https://blog.feabhas.com/2021/09/c20-coroutines/ > > "There seems to be a lot of confusion around the implementation of C++20 > coroutines, which I think is due to the draft technical specification > for C++20 stating that coroutines are a work in progress so we can’t > expect full compiler and library support at this point in time. > A lot of the problems probably arise from the lack of official > documentation about working with coroutines. We have been given C++ > syntax support for coroutines (the co_yield and co_return) but without > all of what I consider full library support. The standard library has > hooks and basic functionality for supporting coroutines, but we must > incorporate this into our own classes. I anticipate that there will be > full library support for generator style coroutines in C++23." The main confusion about C++20 “coroutines” is that they're general coroutines. They're not: they're simple continuations, the special case of /stackless/ coroutines (no dedicated stack for each coroutine). While that's nice performance-wise it's very limited, and the Microsoft style support framework adopted in C++20 requires you to build a full fledged star ship in order to lift a little pebble; it's, well, moronic. --- I once started coding up real coroutines in terms of standard C++ threads. That could be very useful, in contrast to the mostly useless C++17 continuations. However, I stopped fiddling with it when the complexity of the implementation overwhelmed me. No doubt because of a lack of experience in safe multi-tasking. It would be really nice if SOMEONE could do this: real general coroutines, by leveraging real C++ threads. --- That could open the world of safe multi-tasking to C++ programmers in general. Another such enabler: an implementation of Ada-like rendezvous. And, and, ... Occam-like channels, maybe. :) - Alf
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"C++20 Coroutines" by Martin Bond Lynn McGuire <lynnmcguire5@gmail.com> - 2021-09-20 16:30 -0500
Re: "C++20 Coroutines" by Martin Bond Bo Persson <bo@bo-persson.se> - 2021-09-21 09:28 +0200
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-21 11:45 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-21 15:37 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-21 17:40 +0200
Re: "C++20 Coroutines" by Martin Bond Juha Nieminen <nospam@thanks.invalid> - 2021-09-22 05:22 +0000
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-22 09:26 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-22 16:40 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-22 15:01 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-23 05:38 +0200
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-23 09:05 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-24 18:15 +0200
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 00:57 +0000
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-23 09:11 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-24 18:17 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 09:19 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 12:00 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 10:09 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 12:18 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 10:39 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 12:42 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 10:44 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 13:14 +0200
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 12:44 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 15:58 +0200
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 13:59 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 16:23 +0200
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-28 07:24 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 15:28 +0000
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 15:04 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 18:44 +0200
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-26 14:15 +0000
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 12:32 +0000
Re: "C++20 Coroutines" by Martin Bond Juha Nieminen <nospam@thanks.invalid> - 2021-09-23 07:42 +0000
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-23 09:14 +0000
Re: "C++20 Coroutines" by Martin Bond Juha Nieminen <nospam@thanks.invalid> - 2021-09-24 04:42 +0000
Re: "C++20 Coroutines" by Martin Bond Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-24 18:19 +0200
Re: "C++20 Coroutines" by Martin Bond Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-09-24 21:07 +0100
Re: "C++20 Coroutines" by Martin Bond Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-06 13:19 -0700
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 00:58 +0000
Re: "C++20 Coroutines" by Martin Bond Juha Nieminen <nospam@thanks.invalid> - 2021-09-27 05:39 +0000
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-29 02:30 +0000
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 09:20 +0000
Re: "C++20 Coroutines" by Martin Bond "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-09-22 11:31 +0200
Re: "C++20 Coroutines" by Martin Bond Sam <sam@email-scan.com> - 2021-09-22 18:43 -0400
Re: "C++20 Coroutines" by Martin Bond Juha Nieminen <nospam@thanks.invalid> - 2021-09-23 07:45 +0000
Re: "C++20 Coroutines" by Martin Bond "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-23 01:53 -0700
Re: "C++20 Coroutines" by Martin Bond Sam <sam@email-scan.com> - 2021-09-24 19:21 -0400
Re: "C++20 Coroutines" by Martin Bond HorseyWorsey@the_stables.com - 2021-09-25 09:28 +0000
Re: "C++20 Coroutines" by Martin Bond Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 12:38 +0000
Re: "C++20 Coroutines" by Martin Bond Juha Nieminen <nospam@thanks.invalid> - 2021-09-27 05:42 +0000
Re: "C++20 Coroutines" by Martin Bond "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-09-25 15:14 +0200
Re: "C++20 Coroutines" by Martin Bond Manfred <noname@add.invalid> - 2021-09-25 23:07 +0200
Re: "C++20 Coroutines" by Martin Bond "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-09-26 01:50 +0200
Re: "C++20 Coroutines" by Martin Bond Manfred <noname@add.invalid> - 2021-09-26 19:12 +0200
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