| Re: something like perl's 'require 5.4' [message #24696 is a reply to message #24694] |
Tue, 17 April 2001 11:21   |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Vapuser <vapuser@catspaw.jpl.nasa.gov> writes:
> How about:
>
> version=strupcase(strjoin(strsplit(!version.release,'[.-_]', /extract), ""))
> input_version=strupcase(strjoin(strsplit(desired_release,'[. -_]',/extract), ""))
> if version lt input_version then 'eeek'
>
> Clearly `desired_release' would have to be input as a string.
>
> Of couse, this method 'requires' IDL 5.3 (IIRC), to get the regular
> expression semantics of strsplit. The other question is will RSI use
> any separator in version designations besides these three?
Umm, I never thought I'd be saying this, but aren't these a bit
overengineered? I have found that in 95% of the cases the DOUBLE
compare will work, and in 4% of the cases the STRING compare will
work.
If you know which version number you are targetting, then clearly you
can fashion a !VERSION.RELEASE comparison that will do the job.
William, you were probably thinking of a writing general procedure to
handle this type of version enforcement. It's actually a good idea.
But I've found that an "IF !VERSION.RELEASE..." is compact enough to
go right into my code.
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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