The following implements an enum a la C. It probably has been done before and better. I welcome pointer, but this is not my point. Here I am obliged to use twice the same pattern match. I can't even use qr// because I would have no way (at least in perl5) to get at the capture. TheDamian may had wanted to save away the captures to restore them but $1, $2... are read-only as far as the end-programmer is concerned. I have not peeked at Damian's code but this Switch seems to me yet another case for the scopeless eval.

I already discussed at unscoped eval, but there will never be enough shameless plugs in perlmonks for Perl6 and parrot. 

#! /usr/bin/perl
use strict;
use Switch 'Perl6';
use Carp;

sub enum {
  my @enum = split /,/, $_[0];
  my $i = 0;
  for (@enum ) {
    given ($_) {
      when  m/([A-Z]+\d*)(?:\s*=\s*(\d)+)?/i {  
        m/([A-Z]+\d*)(?:\s*=\s*(\d)+)?/i;       
        no strict;
        $i = $2 if defined $2;
        eval "sub $1() { $i }";
        $i++;
    }
      else    { croak qq(bad enum member syntax: "$_") }
    }
  } 
}

enum "INFIX, PREFIX=4, SUFFIX" ;
print INFIX(), ":", PREFIX(), ":",  SUFFIX(), "\n";

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-- stefp -- check out TeXmacs wiki

In reply to perl6: Switch, another case (pun intended) for unscoped eval by stefp

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