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Man Pages
MooseX::SetOnce(3) User Contributed Perl Documentation MooseX::SetOnce(3)
 

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

version 0.200002

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: it's already set!

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.

Ricardo SIGNES <rjbs@cpan.org>

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.
2013-10-05 perl v5.28.1

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