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Man Pages


Manual Reference Pages  -  MOOSEX::SETONCE (3)

.ds Aq ’

NAME

MooseX::SetOnce - write-once, read-many attributes for Moose

CONTENTS

VERSION

version 0.200002

SYNOPSIS

Add the SetOnce trait to attributes:



  package Class;
  use Moose;
  use MooseX::SetOnce;

  has some_attr => (
    is     => rw,
    traits => [ qw(SetOnce) ],
  );



...and then you can only set them once:



  my $object = Class->new;

  $object->some_attr(10);  # works fine
  $object->some_attr(20);  # throws an exception: its already set!



DESCRIPTION

The ’SetOnce’ attribute lets your class have attributes that are not lazy and not set, but that cannot be altered once set.

The logic is very simple: if you try to alter the value of an attribute with the SetOnce trait, either by accessor or writer, and the attribute has a value, it will throw an exception.

If the attribute has a clearer, you may clear the attribute and set it again.

AUTHOR

Ricardo SIGNES <rjbs@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Ricardo SIGNES.

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

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perl v5.20.3 MOOSEX::SETONCE (3) 2013-10-05

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