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Re: Untillian Headache or about the semantic of until

by sundialsvc4 (Abbot)
on Feb 12, 2013 at 19:35 UTC ( #1018434=note: print w/replies, xml ) Need Help??

in reply to Untillian Headache or about the semantic of until

I’ve never had any problems wrapping my head around the concept of until.   And, I never particularly agreed with the language-purists who decried, say, the repeat .. until statement in Pascal.   As long as you clearly understand how a particular language implements the concept, it’s a perfectly sensible idea that we use all the time:   “get on the freeway and then keep driving until you get there.”   “Jump rope until you get tired of jumping.”   A programming language should easily support this very common notion.   The people who correctly point out that it is can be equivalently expressed in terms of while are stating a theoretically-correct point, but not a pragmatic one.   A language is a tool, built for me to get a ($$)job($$) done.   I don’t have to turn my thinking upside-down ... that’s what compilers are for.   It can “figure it out” well enough either way; therefore, it should.

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[ambrus]: I think the minimal implementation here is just a timer and io function, plus pushing to the @REGISTRY.
[Corion]: ambrus: Yeah, at least that's what I think I'll start with. A timer and potentially the dummy IO function that never is ready
[ambrus]: That only lets you invoke the main loop from Prima->run;, not from AnyEvent->condvar- >recv; but that shouldn't matter
[Corion]: ambrus: Details ;)

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