---
name: "Moose::Meta::Attribute::Native::Trait::Bool"
section: "3pm"
platform: "linux"
package: "perl-moose"
version: "2.4001-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Moose::Meta::Attribute::Native::Trait::Bool"
---

# Moose::Meta::Attribute::Native::Trait::Bool(3pm)

Helper trait for Bool attributes

## NAME

Moose::Meta::Attribute::Native::Trait::Bool - Helper trait for Bool attributes

## VERSION

version 2.4001

## SYNOPSIS

```
  package Room;
  use Moose;
  has 'is_lit' => (
      traits  => ['Bool'],
      is      => 'rw',
      isa     => 'Bool',
      default => 0,
      handles => {
          illuminate  => 'set',
          darken      => 'unset',
          flip_switch => 'toggle',
          is_dark     => 'not',
      },
  );
  my $room = Room->new();
  $room->illuminate;        # same as $room->is_lit(1);
  $room->darken;            # same as $room->is_lit(0);
  $room->flip_switch;       # same as $room->is_lit(not $room->is_lit);
  return $room->is_dark;    # same as !$room->is_lit
```

## DESCRIPTION

This trait provides native delegation methods for boolean values. A boolean is a scalar which can be `1`, `0`, `""`, or `"undef"`.

## DEFAULT TYPE

If you don't provide an `"isa"` value for your attribute, it will default to `"Bool"`.

## PROVIDED METHODS

None of these methods accept arguments.

- •

  **set**

  Sets the value to `1` and returns `1`.

- •

  **unset**

  Set the value to `0` and returns `0`.

- •

  **toggle**

  Toggles the value. If it's true, set to false, and vice versa.

  Returns the new value.

- •

  **not**

  Equivalent of 'not `$value`'.

## BUGS

See "BUGS" in Moose for details on reporting bugs.

## AUTHORS

- •

  Stevan Little \<stevan@cpan.org\>

- •

  Dave Rolsky \<autarch@urth.org\>

- •

  Jesse Luehrs \<doy@cpan.org\>

- •

  Shawn M Moore \<sartak@cpan.org\>

- •

  יובל קוג'מן (Yuval Kogman) \<nothingmuch@woobling.org\>

- •

  Karen Etheridge \<ether@cpan.org\>

- •

  Florian Ragwitz \<rafl@debian.org\>

- •

  Hans Dieter Pearcey \<hdp@cpan.org\>

- •

  Chris Prather \<chris@prather.org\>

- •

  Matt S Trout \<mstrout@cpan.org\>

## 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.