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Re: notabug quiz

by liz (Monsignor)
on Dec 12, 2003 at 08:42 UTC ( #314254=note: print w/replies, xml ) Need Help??


in reply to notabug quiz

sub Foo::INIT { print "Hello world\n" } &Foo::INIT;

I think I'm responsible for this one, more or less. For a while I was thinking that BEGIN, CHECK, INIT and END were actually subroutines. Well, they aren't. They're "magic" code blocks, that just happen to allow a "sub" prefix to confuse the hell out of everybody. Which is where the obfuscation In the BEGINning is based on.

Note that you can actually call subroutines named BEGIN, CHECK, INIT or END, but you need a special action to get them defined:

*Foo::INIT = sub { print "Hello world\n" }; &Foo::INIT; __END__ Hello world

Liz

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Re: Re: notabug quiz
by ysth (Canon) on Dec 12, 2003 at 09:45 UTC
      Those magical codeblocks are detectable via caller EXPR though. This is a point in favour of subs in the "codeblocks vs. subs" dilemma.
      --kap

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[atcroft]: .oO(Then there is the effect if a site changes their timezone, such as when the International Date Line was moved by the purchase of Alaska by the US from Russia in 1867, or several places (I cannot recall off-hand) that moved from one side of the Date
[atcroft]: Line to the other recently....)
[atcroft]: .oO(Then again, you also have to be careful if you had it to the database, and be aware of any assumptions it makes (such as SQLite assuming Gregorian calendar and a day of exactly 86400 seconds)...)

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