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Re: Re: Re: Maintainable Code?

by BrowserUk (Pope)
on Nov 12, 2002 at 00:36 UTC ( #212162=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Maintainable Code?
in thread Maintainable Code?

Whilst I completely disagree that the ability to silently typo would ever stop me from using the enormous utility of hashes, there are times when it would be very useful to be able to turn off the autovivification of elements.

Perhaps this could be added as an attribute in Perl 6 so that it could be controlled on a hash by hash basis? I settle for another strict option so that it could be controlled on a lexical basis.

Ideally, I think that it would be great to be able to do this lexically on a hash by hash basis. That way you could indicate some parts of your code that you want to autovivify keys of this hash within this scope, where you know you are going to be creating them, but turn it off in other places where you simply want to access the value of existing keys.

I appreciate that you can use exists to implement this, but its one of those housekeeping chores that I'd really like to be able to have the compiler/interpreter take care of for me. Its less likely to forget than I am:^)



Nah! You're thinking of Simon Templar, originally played (on UKTV) by Roger Moore and later by Ian Ogilvy

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Re: Re: Re: Re: Maintainable Code?
by chromatic (Archbishop) on Nov 12, 2002 at 00:45 UTC

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[hippo]: Make it an option?
[Corion]: hippo: Yes, but I'm not sure that it's even worth the effort of implementing it at all...
[Corion]: You'll only ever need that option if you have a long-running query whose results are not cached by your DB already, and in those cases I presume that the programmer will want to maintain the temporary tables themselves - I wouldn't know when to drop ...
[Corion]: ... the temporary tables, and also don't have a good idea on how to create unique table names for them
[hippo]: OIC. In that case leave it out but invite feature requests and see if any of the users suggest it. :-)
[Corion]: Talking about this makes me realize that it's likely only a half useful idea. But it still would be convenient to have as an option...
[Corion]: hippo: Hmmm - yeah, I could document it and wait for code implementing that option to show up ;-D

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