perl - GetOptions Check Option Values -

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i updating existing perl script uses getoptions getopt::long. want add option takes string parameter , can have 1 of 3 values: small, medium, or large. there way make perl throw error or kill script if other string value specified? far have:

my $value = 'small'; getoptions('size=s'  => \$value);

you use subroutine handle processing of option. user-defined subroutines handle options

my $size = 'small';  # default getoptions('size=s'  => \&size); print "$size\n";  sub size {     %sizes = (             small  => 1,             medium => 1,             large  => 1     );      if (! exists $sizes{$_[1]}) {         # die "$_[1] not valid size\n";          # changing use exit statement works expected         print "$_[1] not valid size\n";         exit;     }      $size = $_[1]; }

i put sizes hash, use array , grep toolic showed.


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