++ed by:

1 PAUSE user

Author image Tom Hukins
and 3 contributors


MooseX::Attribute::ChainedClone - Attribute that returns a cloned instance


version 1.0.3


  package Test;
  use Moose;

  has debug => (
      traits => [ 'ChainedClone' ],
      is => 'rw',
      isa => 'Bool',
      default => 0,

  sub complex_method
      my $self = shift;
      print "helper message" if $self->debug;
  sub clone {
      my $self = shift;
      # custom clone code here
      # defaults to:
      return bless { %$self }, ref $self;


Which allows for:

    my $test = Test->new;
    $test->debug(1)->complex_method; # debug enabled
                                     # complex_method is called on a cloned instance
                                     # with debug set to 1

    $test->complex_method;           # debug is still disabled on $test

    $test->debug(1); # returns a cloned $test instance with debug set to 1
    $test->debug;    # returns 0


MooseX::Attribute::ChainedClone is a Moose Trait which allows for method chaining on accessors by returning a cloned instance of $self on write/set operations.

If $self has a clone method, this method is invoked to clone the instance. This allows for easy integration with MooseX::Clone or any custom made clone method. If no clone method is available, the new instance is build using bless { %$self }, ref $self.


  • Tom Hukins <tom@eborcom.com>

  • Moritz Onken <onken@netcubed.de>

  • David McLaughlin <david@dmclaughlin.com>


This software is copyright (c) 2017 by Tom Hukins.

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


Please report any bugs or feature requests on the bugtracker website http://rt.cpan.org/Public/Dist/Display.html?Name=MooseX-Attribute-Chained or by email to bug-moosex-attribute-chained at rt.cpan.org.

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.