No no, I mean eval to generate two near-identical subs at compile time — no AUTOLOAD funkiness or anything. 
BEGIN {
    my $merge_code = <<'EOC';
    sub %s {
        my ($data) = @_;
        while ( $some_condition ) {
            # big loop, no embedded loops
            $count = $count1 %s $count2;
        }
    }
EOC

    eval sprintf $merge_code, merge => '+';
    eval sprintf $merge_code, unmerge => '-';
}

[download]
I think it's very clear what's going on here, and you still get the benefit of only maintaining a single copy of the code.

Makeshifts last the longest.

In reply to Re^8: Substituting Newline Characters by Aristotle
in thread Substituting Newline Characters by bkiahg

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