|Welcome to the Monastery|
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:
Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.