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Re^3: When should I use a dispatch table?

by BrowserUk (Pope)
on Dec 01, 2006 at 01:36 UTC ( #587101=note: print w/replies, xml ) Need Help??

in reply to Re^2: When should I use a dispatch table?
in thread When should I use a dispatch table?

I was trying to point out that "the overhead of looking up the key, dereferencing the value," is marginal relative to the overhead of "executing the code ref".

Even that last phrase slightly conflates

  • the process of invoking the sub;
  • executing the code it contains.

I realise that you know the difference, but your wording--combined with your use of "purported"--tended to imply that "looking up the key" was a significant factor. Which it isn't. I sought to demonstrate this.

Unfortunately, typical dispatch tables use code refs.

It wouldn't be a dispatch table if it didn't :). I agree, you cannot avoid the overhead of calling the subroutine.

I had a couple of cracks at coding a 'macro processor'--really just a sub inliner a couple of years of them may even be posted here somewhere?--using source filters, but it was never very satisfactory.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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[jdporter]: is there a module for expanding tabs in text?
[jdporter]: A: yes.
[Lady_Aleena]: I don't know how hard it will be to get out of that mess.
[LanX]: M-x untabify
[choroba]: I don't think they're multiple people. I was told "he or she" sounds old-fashioned and "they" is the way to say it
[pryrt]: Those others were definitely offensive or unequivocably rude, I agree.
[choroba]: (well, it comes from the 14th century, so labelling it as "modern" doesn't seem appropriate)
[Your Mother]: "They" is becoming accepted but it irritates me sometimes. I tend to just pick she or he randomly or try to use "one."
LanX thinks it is appropriate here :)
[Your Mother]: They would think so.

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