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Re: Moose 'clone' Constructor

by Arunbear (Prior)
on Jul 04, 2018 at 09:54 UTC ( #1217873=note: print w/replies, xml ) Need Help??

in reply to Moose 'clone' Constructor

See Object instance construction and cloning, but essentially:
my $cloned_object = $existing_object->meta->clone_object($existing_obj +ect);

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Re^2: Moose 'clone' Constructor
by kcott (Bishop) on Jul 04, 2018 at 11:23 UTC

    G'day Arunbear,

    ++ What can I say: great minds link alike. :-)

    When I got home from work, Corion's reply was the only response at that time. I followed the link he'd provided, followed some more links from that, then hit "reply". As I was composing, I noticed I now had a reply from you and thought: "Oh good, more information, I'll look at that in a minute." — and when I did, I then thought: "Hmmm, that looks familiar."

    Anyway, I've only just found it, perhaps you've used it. I noticed there's an additional argument:

    $metaclass->clone_object($instance, %params)

    Is %params as straightforward as it seems? I'm thinking maybe issues with values that are references to data structures, as opposed to simpler (Str, Int, etc.) values.

    — Ken

      %params are the same kind of data as were passed to the constructor when $existing_object was created (but now you have a chance to override those if needed).

        OK, thanks. I may have been thinking along the lines of:

        has x => (..., default => 'abc'); has y => (..., default => sub { [qw{a b c}] });

        where that second line can't be written as:

        has y => (..., default => [qw{a b c}]);

        But, of course, in the constructor you use the values as is (without needing a coderef):

        ...->new(x => 'def', y => [qw{d e f}]);

        — Ken

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