| Re: something like perl's 'require 5.4' [message #24701 is a reply to message #24700] |
Mon, 16 April 2001 16:57   |
Craig Markwardt
Messages: 1869
Registered: November 1996
|
Senior Member |
|
|
Vapuser <vapuser@catspaw.jpl.nasa.gov> writes:
> Hi all.
>
> I'm looking for something that check the version of the current IDL
> session against an input version, like perl's 'require 5.4'
> semantics and I *thought* I saw someone mention using something very
> much like this.
>
> Does anyone know of such a thing or was I just hallucinating?
Extending on JD's answer with two more possibilities:
if !version.release LT '5.4' then message, 'ERROR'
if double(!version.release) LT 5.4 then message, 'ERROR'
The first comparison is a string compare, while the second one is a
numeric compare. There is a slight difference, but in practice they
are identical, and they also both handle the case of 5.4.1, etc. The
former will handle 5.4.1a, but I think it's rare. I always use the
latter.
Craig
--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
------------------------------------------------------------ --------------
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
