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Asynchrony is not concurrency

(kristoff.it)
292 points kristoff_it | 3 comments | 18 Jul 25 19:21 UTC | HN request time: 0.001s | source
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raluk ◴[18 Jul 25 20:46 UTC] No.44609651[source]▶
One thing that most languages are lacking is expressing lazy return values. -> await f1() + await f2() and to express this concurently requres manually handing of futures.
replies(3): >>44609880 #>>44610056 #>>44610348 #
sedatk ◴[18 Jul 25 21:11 UTC] No.44609880[source]▶
Which languages do have such a thing?
replies(2): >>44610179 #>>44610709 #
steveklabnik ◴[18 Jul 25 22:57 UTC] No.44610709[source]▶
Rust does this, if you don’t call await on them. You can then await on the join of both.
replies(1): >>44610738 #
sedatk ◴[18 Jul 25 23:01 UTC] No.44610738[source]▶
Is the "join" syntax part of the language?
replies(2): >>44611332 #>>44613040 #
1. tcfhgj ◴[19 Jul 25 00:23 UTC] No.44611332[source]▶
no

https://doc.rust-lang.org/std/future/macro.join.html

replies(1): >>44612037 #
2. sedatk ◴[19 Jul 25 02:30 UTC] No.44612037[source]▶
Then it doesn’t apply in this case.
replies(1): >>44615353 #
3. tcfhgj ◴[19 Jul 25 13:34 UTC] No.44615353[source]▶
why?