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I have a program which needs to run on Windows and Linux. Most of the code works unchanged on both systems. Only a few sub's are different. There are several solutions for approaching this problems, and I will outline those I have found, below, but since I'm not fully happy with all of them, I'm posting here - maybe someone propses a solution which is more clever than mine.

  1. I could inside the function distinguish, on which platform I'm running:
    sub f { if($^O =~ /Win/) { .... } else { ... } }
  2. I could use subrefs instead of subs:
    my $f = if($^O =~ /Win/) ? sub { ... } else { ... };
    or use a singleton class which bundles the respective subs.
  3. I could package the subs into two modules, and do a use if .... to load one module or the other, depending on the platform.

The last approach seems to me the most elegant, but also the one which is the most complicated (currently, my fairly simple program fits into one file, while with this approach, I would need 3 files). Not really bad, but I wonder, if there is an equally good, or even better, solution, which is simpler. If Perl would have conditional compilation, I would write something like:
# Not real Perl code right now! IF .... sub f { .... } sub g { .... } ELSE sub f{ ... } sub g { ... } END
Ronald Fischer <>

In reply to Writing portable code by rovf

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