|Do you know where your variables are?|
Writing for backwards compatibilityby xdg (Monsignor)
|on Nov 08, 2005 at 18:35 UTC||Need Help??|
I was recently burned by unintentionally breaking backwards compatibility with Perl 5.6 by using use Exporter 'import' rather than adding Exporter to the @ISA array. I realized that I don't have a very systematic approach to coding for backwards compatibility, which got me wondering about what else I should be mindful of and how others handle this problem.
I know about several well-known limitations, of course, e.g.:
And I know some less well-known limitations (at least, I don't see them mentioned often, so I'm guessing they're less well known), e.g.:
I wish I had an encyclopedic knowledge of the delta files: perl58delta, perl56delta and so on. The ideal, of course, would be something like RFC: perlfeaturedelta going back for several versions of Perl. (Joost -- did you ever take that further?)
However, in lieu of something that exhaustive being available, I'd love to hear from fellow monks about their real-life experiences and practices.
Some questions for discussion:
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