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In order to mop the kitchen floor, the Right Way to prepare the bucket of cleaning agent is…

  • fill with water, then pour some soap
  • pour some soap, then fill with water
  • fill water only
  • mopping is unnecessary
  • only my spouse needs to know this
  • I pay someone to mop

Update: This post was preceded by an hour long IRC discussion about what English terms to use for where I use “soap” and “cleaning agent” above. There weren't too many good suggestions for “cleaning agent” (there's “solution”), and I'm not really satisfied with that phrase. However, there were more possibilities instead of “soap”: qw“detergent bleach ammonia surfactant”, “pine cleaner”. I tried to defend the statement that the dictionary definition for “soap” is clear enough in that it includes only produces whose main element is an organic substance made from fat and alkali, whereas you usually mop with a product whose main ingredient is hydrogen chloride. We decided this was false, “soap” includes both kind of substances in informal speech. Indeed, most people don't even know the difference, which is why there are home accidents from mixing bleach made of hydrogen chloride with basic chemicals, when a chemical reaction causes poisonous chlorine gas to be released (don't try this at home).


In reply to Re: poll ideas quest 2007 (Mopping water) by ambrus
in thread poll ideas quest 2007 by ysth

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    [Corion]: Yesterday I encountered an interesting data structure problem. I have a remote program that emits events, and my client listens for these events with one-shot callbacks, that is, I register the callback and if the event gets generated that callback ...
    [Lady_Aleena]: robby_dobby, every day. Chaos is my life with few controls.
    [Corion]: ... gets called once. The data structure for that is just a hash of arrays, mapping the event type to a queue of registered one-shots, and the first one-shot from the queue gets removed and called.
    [Corion]: But now I want to register a one-shot for two events, of which only one will arrive, so my data structure doesn't work anymore...
    [Lady_Aleena]: Corion, ouchy.
    [Corion]: (maybe I should write this up as a SoPW) - currently, the "most efficient" data structure I come up with is a single array which I scan for the first fitting one-shot. Not efficient but I don't expect more than five outstanding one-shots anyway
    [choroba]: can't you create a meta-key corresponding to the disjunction of the events?
    [robby_dobby]: Corion: Heh. This whole thing smells of Strategy Pattern or MVC pattern.
    [Corion]: And performance linear to the number of registered one-shots doesn't feel that bad. Maybe I should collect statistics on how many callbacks are outstanding ;)
    [Corion]: choroba: Yes, but the longer I thought about efficient hashes mapping the event type back to their callbacks, and how to keep them in sync, the more I thought that all that optimization might just not be worth it, even if it's horribly inelegant

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