How do I check scalar for an 'inf' value in Perl?

Question

Possible Duplicate:
How do I create or test for NaN or infinity in Perl?

How can I check, if scalar holds inf value?

I check NaN as $scalar != $scalar, what to do with inf?

$scalar == inf does not work, since inf is a bareword

Duplicate: http://stackoverflow.com/questions/1185822/how-do-i-create-or-test-for-nan-or-infinity-in-perl — Greg Bacon, Feb 13 '10 at 07:21

score 0 · Answer 1 · answered Feb 13 '10 at 10:10

0

you can use this to check for infinity:

$scalar < 9**9**9

that constant is so large that it will be interpreted as infinite by Perl

answered Feb 13 '10 at 10:10

Eric Strom

score -1 · Answer 2 · answered Feb 13 '10 at 07:17

-1

I found a dirty hack right now.

($scalar eq "inf")

Does anything cleaner exist?

answered Feb 13 '10 at 07:17

Karel Bílek

1

Not good. Perl will stringify inf however the underlying libc does, and that can vary (both within the C standard and, on Windows, far outside it). – ysth Feb 14 '10 at 04:22

2 Answers2