You're right that the docs are a little sparse in that area. There are some examples though - Moose::Manual::Attributes, Moose::Cookbook::Basics::Point_AttributesAndSubclassing, Moose::Cookbook::Basics::BankAccount_MethodModifiersAndSubclassing, etc. If you don't think this is enough, please submit a bug report.
Out of the box, Moose supports two styles of object construction:
# Key-value pairs
my $point1 = Point->new(x => 10, y => 20);
# Hashref
my $point2 = Point->new({ x => 10, y => 20 });
In your class it's possible to override BUILDARGS to add your own argument parsing...
use v5.12;
{
package Point;
use Moose;
has 'x' => (is => 'rw', isa => 'Int');
has 'y' => (is => 'rw', isa => 'Int');
around BUILDARGS => sub {
my $orig = shift;
my $self = shift;
# Allow object to be built by passing two integers...
if (@_ == 2 and $_[0] =~ /^[0-9]+$/ and $_[1] =~ /^[0-9]+$/) {
return { x => $_[0], y => $_[1] };
}
# If not two integers, then fall back to standard Moose BUILDA
+RGS...
return $self->$orig(@_);
};
__PACKAGE__->meta->make_immutable;
}
# Use our overridden BUILDARGS...
print Point->new(10, 20)->dump;
# Standard Moose BUILDARGS is fallback...
print Point->new(x => 10, y => 20)->dump;
print Point->new({ x => 10, y => 20 })->dump;
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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