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Re: something like perl's 'require 5.4'
JD Smith wrote:
> Craig Markwardt wrote:
> > Vapuser <firstname.lastname@example.org> 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.
> IDL> print, double('5.4.1') gt 5.4
IDL> print, double('5.4.1') ge 5.4d0
Doesn't assuage your other concerns regarding the significance of the last digit however.
I use comparisons like the above for code that contains BREAK, CONTINUE, SWITCH, etc
statements. Or similar for the version in which pointers and objects were introduced (5.2?
I think it would be pretty difficult (for unsophisticated ol' me) to maintain code that
contains version tests for when RSI fixes a bug -- like in the examples you listed....
although, HISTOGRAM and REBIN? Never use 'em. :o) What _possible_ use could they be??
(*) sarcasm alert for the irony impaired
Paul van Delst A little learning is a dangerous thing;
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Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
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