NAME
    Constant::Exporter - define and export constants easily

SYNOPSIS
        # define constants in your MyApp::Constants,

        package MyApp::Constants;
        use strict;
        use warnings;

        use Constant::Exporter (
            EXPORT => {
                FB_CLIENT_ID => 12345,
            },
            EXPORT_OK => {
                TITLE_MAX_LENGTH => 128,
            },
            EXPORT_TAGS => {
                user_status => {
                    USER_STATUS_FB_ASSOCIATED     => 1,
                    USER_STATUS_FB_NOT_ASSOCIATED => 0,
                },
            },
            EXPORT_OK_TAGS => {
                fb_api_error => {
                    ERROR_OAUTH       => 190,
                    ERROR_API_SESSION => 102,
                    ERROR_API_USER_TOO_MANY_CALLS => 17,
                },
                fb_payment_error => {
                    ERROR_PAYMENTS_ASSOCIATION_FAILURE   => 1176,
                    ERROR_PAYMENTS_INSIDE_IOS_APP        => 1177,
                    ERROR_PAYMENTS_NOT_ENABLED_ON_MOBILE => 1178,
                },
            },
        );

        1;

        # then use it like Exporter's `%EXPORT_TAGS` and `@EXPORT_OK`
        package main;
        use MyApp::Constants qw( TITLE_MAX_LENGTH :fb_api_error );

        sub foo {
            my ($title) = @_;
            if (length $title > TITLE_MAX_LENGTH) {
                ...
            }
        }

        sub bar {
            my ($response) = @_;

            if ($response->{error}{code} == ERROR_OAUTH) {
                ...
            }
        }

DESCRIPTION
    Constant::Exporter is a module to define and export constants easily.

    This module adopts Exporter's full functionality so you can import
    constants with default constants, tags or only selected constants.

KEYS AND MEANINGS
  "EXPORT", "EXPORT_TAGS"
    Constant names in "EXPORT" and "EXPORT_TAGS" will be exported by
    default.

  "EXPORT_OK" "EXPORT_OK_TAGS"
    Constant names in "EXPORT_OK" and "EXPORT_OK_TAGS" will not be exported
    by default. You can import these constants by feeding arguments to your
    constant class.

AUTHOR
    punytan <punytan@gmail.com>

COPYRIGHT
    Copyright 2013- punytan

LICENSE
    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

SEE ALSO
    Exporter