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Test Your Knowledge in Computers #880
Difficulty: Medium
SCADA systems that tie together decentralized facilities such as power, oil, gas pipelines, water distribution and wastewater collection systems were designed to be open, robust, easily operated and repaired, and highly secure.
True or False?
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Moose::Cookbook::Snack::Keywords(3)			User Contributed Perl Documentation		       Moose::Cookbook::Snack::Keywords(3)

Moose::Cookbook::Snack::Keywords - Restricted "keywords" in Moose VERSION
version 2.1202 DESCRIPTION
Moose exports a number of sugar functions in order to emulate Perl built-in keywords. These can cause clashes with other user-defined functions. This document provides a list of those keywords for easy reference. The 'meta' keyword "use Moose" adds a method called "meta" to your class. If this conflicts with a method or function you are using, you can rename it, or prevent it from being installed entirely. To do this, pass the "-meta_name" option when you "use Moose". For instance: # install it under a different name use Moose -meta_name => 'moose_meta'; # don't install it at all use Moose -meta_name => undef; Moose Keywords If you are using Moose or Moose::Role it is best to avoid these keywords: extends with has before after around super override inner augment confess blessed Moose::Util::TypeConstraints Keywords If you are using Moose::Util::TypeConstraints it is best to avoid these keywords: type subtype class_type role_type maybe_type duck_type as where message inline_as coerce from via enum find_type_constraint register_type_constraint Avoiding collisions Turning off Moose To remove the sugar functions Moose exports, just add "no Moose" at the bottom of your code: package Thing; use Moose; # code here no Moose; This will unexport the sugar functions that Moose originally exported. The same will also work for Moose::Role and Moose::Util::TypeConstraints. Sub::Exporter features Moose, Moose::Role and Moose::Util::TypeConstraints all use Sub::Exporter to handle all their exporting needs. This means that all the features that Sub::Exporter provides are also available to them. For instance, with Sub::Exporter you can rename keywords, like so: package LOL::Cat; use Moose 'has' => { -as => 'i_can_haz' }; i_can_haz 'cheeseburger' => ( is => 'rw', trigger => sub { print "NOM NOM" } ); LOL::Cat->new->cheeseburger('KTHNXBYE'); See the Sub::Exporter docs for more information. namespace::autoclean and namespace::clean You can also use namespace::autoclean to clean up your namespace. This will remove all imported functions from your namespace. Note that if you are importing functions that are intended to be used as methods (this includes overload, due to internal implementation details), it will remove these as well. Another option is to use namespace::clean directly, but you must be careful not to remove "meta" when doing so: package Foo; use Moose; use namespace::clean -except => 'meta'; # ... SEE ALSO
Moose Moose::Role Moose::Util::TypeConstraints Sub::Exporter namespace::autoclean namespace::clean AUTHORS
o Stevan Little <> o Dave Rolsky <> o Jesse Luehrs <> o Shawn M Moore <> o XXXX XXX'XX (Yuval Kogman) <> o Karen Etheridge <> o Florian Ragwitz <> o Hans Dieter Pearcey <> o Chris Prather <> o Matt S Trout <> COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by Infinity Interactive, Inc.. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.18.2 2014-01-19 Moose::Cookbook::Snack::Keywords(3)

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