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Further to that, here's the Moose example reworked to use MooseX::Role::Parameterized; this factors out the grid-related logic into a role, to make it easier to create classes that are a grid of Cell objects, or a grid of strings, or a grid of filehandles, or whatever...

use v5.14; package Cell { use Moose; use Types::Standard -types; has name => (is => 'rw', isa => Str); sub from_name { my $class = shift; $class->new(name => @_); } __PACKAGE__->meta->make_immutable; } package Grid { use MooseX::Role::Parameterized; use List::Objects::Types -types; use Types::TypeTiny qw( TypeTiny ); parameter type_constraint => (isa => TypeTiny, required => 1); role { my $p = shift; has cells => ( is => 'ro', isa => TypedArray[TypedArray[ $p->type_constraint ]], coerce => 1, handles => { get_row => 'get', set_row => 'set', all_rows => 'all', add_row => 'push', }, ); method get_cell => sub { my $self = shift; my ($row, $col) = @_; $self->get_row($row)->get($col); }; method set_cell => sub { my $self = shift; my ($row, $col, $value) = @_; $self->get_row($row)->set($col, $value); }; method all_cells => sub { my $self = shift; map { $_->all } $self->all_rows; }; method get_col => sub { my $self = shift; my ($col) = @_; map { $_->get($col) } $self->all_rows; }; method set_col => sub { my $self = shift; my ($col, $values) = @_; my @rows = $self->all_rows; for my $i (0 .. $#rows) { $rows[$i]->set($col) = $values->[$i]; } }; method add_col => sub { my $self = shift; my ($values) = @_; my @rows = $self->all_rows; for my $i (0 .. $#rows) { $rows[$i]->push($values->[$i]); } }; method all_cols => sub { my $self = shift; my $col_count = $self->get_row(0)->count; my $return_type = TypedArray[$p->type_constraint]; return map { $return_type->coerce($_); } map { [ $self->get_col($_) ]; } 0 .. $col_count-1; }; } } package CellGrid { use Moose; use Types::Standard -types; with Grid => { type_constraint => (InstanceOf['Cell'])->plus_constructors(Str +, 'from_name') }; sub to_string { my $self = shift; join "\n", map(join("\t", map($_->name, $_->all)), $self->all_ +rows); } __PACKAGE__->meta->make_immutable; } my $grid = CellGrid->new( cells => [ [ 'foo1', 'bar1' ], [ 'foo2', 'bar2' ], ] ); $grid->add_col(['baz1', 'baz2']); $grid->get_cell(1, 1)->name('QUUX'); say $grid->to_string; __END__ foo1 bar1 baz1 foo2 QUUX baz2

I really need to add some sugar for parameterized roles to Moops. :-)

use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name

In reply to Re^2: How do I work with multidimensional arrays in Moose? by tobyink
in thread How do I work with multidimensional arrays in Moose? by paulymer

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