Sub::HandlesVia::HandlerLibrary::Enum(3p)

NAME
Sub::HandlesVia::HandlerLibrary::Enum - library of enum-related methods

SYNOPSIS
  package My::Class {
    use Moo;
    use Sub::HandlesVia;
    use Types::Standard 'Enum';
    has status => (
      is => 'ro',
      isa => Enum[ 'pass', 'fail' ],
      handles_via => 'Enum',
      handles => {
        'is_pass'      => [ is     => 'pass' ],
        'is_fail'      => [ is     => 'fail' ],
        'assign_pass'  => [ assign => 'pass' ],
        'assign_fail'  => [ assign => 'fail' ],
      },
      default => sub { 'fail' },
    );
  }

Or, using a shortcut:

  package My::Class {
    use Moo;
    use Sub::HandlesVia;
    use Types::Standard 'Enum';
    has status => (
      is => 'ro',
      isa => Enum[ 'pass', 'fail' ],
      handles_via => 'Enum',
      handles => {
        'is_pass'      => 'is_pass',
        'is_fail'      => 'is_fail',
        'assign_pass'  => 'assign_pass',
        'assign_fail'  => 'assign_fail',
      },
      default => sub { 'fail' },
    );
  }

(Sub::HandlesVia::HandlerLibrary::Enum will split on "_".)

DESCRIPTION
This is a library of methods for Sub::HandlesVia.

DELEGATABLE METHODS
This allows for delegation roughly compatible with MooseX::Enumeration and MooX::Enumeration, even though that's basically a renamed subset of Sub::HandlesVia::HandlerLibrary::String anyway.

  is( $value )
Returns a boolean indicating whether the enum is that value.

  my $object = My::Class->new( status => 'pass' );
  say $object->is_pass(); ## ==> true
  say $object->is_fail(); ## ==> false

  assign( $value )
Sets the enum to the value.

  my $object = My::Class->new( status => 'pass' );
  say $object->is_pass(); ## ==> true
  say $object->is_fail(); ## ==> false
  $object->assign_fail();
  say $object->is_pass(); ## ==> false
  say $object->is_fail(); ## ==> true

  set( $value )
An alias for "assign".

TYPE CONSTRAINT SHORTCUT
The Enum handler library also allows an "enum" shortcut in the attribute spec.

  package My::Class {
    use Moo;
    use Sub::HandlesVia;
    has status => (
      is          => 'ro',
      enum        => [ 'pass', 'fail' ],
      handles_via => 'Enum',
      handles     => {
        'is_pass'      => [ is     => 'pass' ],
        'is_fail'      => [ is     => 'fail' ],
        'assign_pass'  => [ assign => 'pass' ],
        'assign_fail'  => [ assign => 'fail' ],
      },
      default     => sub { 'fail' },
    );
  }

SHORTCUT CONSTANTS
This module provides some shortcut constants for indicating a list of delegations.

  package My::Class {
    use Moo;
    use Types::Standard qw( Enum );
    use Sub::HandlesVia;
    use Sub::HandlesVia::HandlerLibrary::Enum qw( HandleIs );
    has status => (
      is          => 'ro',
      isa         => Enum[ 'pass', 'fail' ],
      handles_via => 'Enum',
      handles     => HandleIs,
      default     => sub { 'fail' },
    );
  }

Any of these shortcuts can be combined using the " | " operator.

    has status => (
      is          => 'ro',
      isa         => Enum[ 'pass', 'fail' ],
      handles_via => 'Enum',
      handles     => HandleIs | HandleSet,
      default     => sub { 'fail' },
    );

  "HandleIs"
Creates delegations named like "is_pass" and "is_fail".

  "HandleNamedIs"
Creates delegations named like "status_is_pass" and "status_is_fail".

  "HandleSet"
Creates delegations named like "set_pass" and "set_fail".

  "HandleNamedSet"
Creates delegations named like "status_set_pass" and "status_set_fail".

BUGS
Please report any bugs to <https://github.com/tobyink/p5-sub-handlesvia/issues>.

SEE ALSO
Sub::HandlesVia.

AUTHOR
Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE
This software is copyright (c) 2022 by Toby Inkster.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.