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Re^3: OO Pattern Container x Elements and Method Chaining

by choroba (Archbishop)
on Oct 08, 2021 at 15:59 UTC ( #11137357=note: print w/replies, xml ) Need Help??


in reply to Re^2: OO Pattern Container x Elements and Method Chaining
in thread OO Pattern Container x Elements and Method Chaining

Yes, a wrapper with overloaded numeric comparison seems to work:
#!/usr/bin/perl use warnings; use strict; use feature qw{ say }; { package Element; use Moo; has name => (is => 'ro'); } { package Element::Wrapped; use Moo; use overload '==' => sub { $_[0]->element == $_[1]->element }, fallback => 1; has element => (is => 'ro', required => 1, handles => [qw[ name ]]); # <- and any other Elem +ent methods. has active_container => (is => 'rw'); } { package Container; use Moo; has elements => (is => 'ro', default => sub { [] }); sub add_elem { my ($self, $element) = @_; push @{ $self->elements }, $element unless grep $_ == $element, @{ $self->elements }; } sub get_elem { my ($self, $name) = @_; my $elem = (grep $_->name eq $name, @{ $self->elements })[0]; my $wrap = 'Element::Wrapped'->new(element => $elem); $wrap->active_container($self); return $wrap } } use Test2::V0; plan 6; my $elem1 = 'Element'->new(name => 'one'); my ($cont1, $cont2) = map 'Container'->new, 1, 2; $cont1->add_elem($elem1); $cont2->add_elem($elem1); is $cont1->get_elem('one')->active_container, $cont1; is $cont2->get_elem('one')->active_container, $cont2; my $e1 = $cont1->get_elem('one'); my $e2 = $cont2->get_elem('one'); ok $e1->active_container != $e2->active_container; ok $e1 == $e2; is $e1->name, 'one'; is $e1->name, $e2->name;
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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Re^4: OO Pattern Container x Elements and Method Chaining
by LanX (Sage) on Oct 08, 2021 at 17:35 UTC
    Thanks a lot, again.

    my Moo(se)->skills are still limited

    I don't think the overload is really necessary, I don't mind if two Wrapper::Elements identify differently

    handles intrigues me, do you know how it's implemented?

    Unfortunately we have a performance issue, too.

    and

    > # <- and any other Element methods.

    means the delegated methods must be listed explicitly and updated when Element grows in methods?

    That's why I mentioned AUTOLOAD and/or inheritance in the OP.

    Cheers Rolf
    (addicted to the Perl Programming Language :)
    Wikisyntax for the Monastery

    UPDATE

    according to https://metacpan.org/pod/Moose#REGEXP I can dynamically filter all methods needed to be delegated at compiletime :)

      > according to https://metacpan.org/pod/Moose#REGEXP I can dynamically filter all methods needed to be delegated at compiletime :)

      That's a Mooseism not present in Moo.

      map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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