Moose::Meta::Attribute::Native::Trait::Bool(3) User Contributed Perl Documentation Moose::Meta::Attribute::Native::Trait::Bool(3)

# [SYNOPSIS](#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](#DESCRIPTION)

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

# [DEFAULT TYPE](#DEFAULT_TYPE)

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

# [PROVIDED METHODS](#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](#BUGS)

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

2026-08-29 perl v5.44.0

---

Document: Moose::Meta::Attribute::Native::Trait::Bool(3pm) from perl-moose 2.4000-r4 (Chainguard OS)
Source: https://github.com/moose/Moose