I cheat, personally. I have a program which loads all of its contents from an XML file.

I think I've got this down the bare minimum required to be a useful example. (there's a few different type of config parameters, not all of which get exported, and logic for adding new values)

package Physics::Solar::VSO::Config;

use strict;
use warnings;

our $VERSION = 1.01_04;

require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = ();
# @EXPORT_OK is below.

use XML::Simple;

my $parserOptions = {
        cache                   => [ 'memshare' ],
        NoAttr                  => 1,
        SuppressEmpty   => undef,
};
( my $configFile = __FILE__ ) =~ s/\.pm$/.xml/;

my $config ||= XMLin( $configFile, %$parserOptions );
our %CONFIG : unique = ( %{ $config->{'CONFIG'} || {} } );

sub AUTOLOAD {
    (my $constant = our $AUTOLOAD) =~ s/^.*://;
    no strict 'refs';
    
    if (exists($CONFIG{$constant})) {
        *{$AUTOLOAD} = sub { return $CONFIG{$constant} };
        return &{$AUTOLOAD};
    } else {
        require Carp;
        Carp::croak "Unknown constant : $constant";
    }
}

@Physics::Solar::VSO::Config::EXPORT_OK = ( keys %CONFIG );

[download]

Update: You'd of course want to swap EXPORT_OK and EXPORT, so you don't have to pass in which constants you wanted to import (also cleaned up a typo, and split a paragrah)

In reply to Re: How to include a large number of constants? by jhourcle
in thread How to include a large number of constants? by noslenj123

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