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Re^2: Converting a list of numbers to use a range operator

by Anonymous Monk
on Mar 24, 2013 at 13:22 UTC ( #1025141=note: print w/replies, xml ) Need Help??


in reply to Re: Converting a list of numbers to use a range operator
in thread [Solved] Converting a list of numbers to use a range operator

OK, very short code, but why does this push @a,"inf" work? Where is this "inf" documented?

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Re^3: Converting a list of numbers to use a range operator
by LanX (Bishop) on Mar 24, 2013 at 14:18 UTC
    > but why does this push @a,"inf" work?

    inf and -inf are special numeric constants

    DB<159> $a=inf => "inf" DB<160> --$a => "inf" DB<161> ++$a => "inf"

    in this case they are handy, because $now+1 == inf won't raise a warning

    DB<116> use warnings;5=="inf" => "" DB<117> use warnings;5=="WhatEver" Argument "WhatEver" isn't numeric in numeric eq (==) at (eval 47)[mult +i_perl5db.pl:644] line 2.

    > Where is this "inf" documented?

    no idea, I scanned the perldocs for X<inf> w/o success.

    see also Infinity and Inf?

    Cheers Rolf

    ( addicted to the Perl Programming Language)

    UPDATE: deleted wrong example about incrementing inf

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[choroba]: bare SQL seems to work differently. Failing a prepared statement doesn't abort the transaction. So it's a behaviour of the DBD driver
[choroba]: and smells like a bug
[choroba]: oh wait
[choroba]: it doesn't abort, but it blocks any other operations than aborting
[choroba]: so it kind of makes sense

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