- バックアップ一覧
- 差分 を表示
- 現在との差分 を表示
- ソース を表示
- Perl-Mouse/Moose へ行く。
Moose 基本
subtypeによる型のカスタマイズ
package Obj;
use Moose;
use Moose::Util::TypeConstraints;
subtype 'Obj::Int'
=> as 'Int'
=> where { $_ >= 10 }
=> message { "$_ is under 10" };
has n => (
is => 'rw',
isa => 'Obj::Int',
);
package main;
my $o = Obj->new;
$o->n(9);
注
- subtypeを使うとMaybe[]が使えなくなる。
coerceによる型の強制変換
package Obj;
use Mouse;
use Mouse::Util::TypeConstraints;
coerce 'Int'
=> from 'Str'
=> via { 999 };
has n => (
is => 'rw',
isa => 'Int',
coerce => 1,
);
package main;
my $o = Obj->new;
$o->n('abc');
print $o->n,"\n";
subypeとcoerceを使ってDateTimeアトリビュートを実装
package Obj;
use Mouse;
use Mouse::Util::TypeConstraints;
use DateTime::Format::Pg;
subtype 'Obj::DateTime'
=> as 'DateTime';
coerce 'Obj::DateTime'
=> from 'Str'
=> via { DateTime::Format::Pg->parse_date($_) };
=> from 'Undef'
=> via { DateTime->now };
has dt => (
is => 'rw',
isa => 'Obj::DateTime',
coerce => 1,
);
package main;
my $o = Obj->new;
$o->dt('2009-02-03');
print $o->dt->ymd,"\n";
aroundによるゲッターの拡張
package Obj;
use Moose;
has n => (
is => 'rw',
isa => 'Int',
);
around 'n' => sub {
my $next = shift;
my $self = shift;
return $self->$next . '!' unless @_;
my $arg = shift;
return $self->$next($arg);
};
package main;
my $o = Obj->new;
$o->n(10);
print $o->n, "\n"; # 10!とビックリがつく
http://search.cpan.org/perldoc?Moose::Manual::FAQ#How_can_I_inflate/deflate_values_in_accessors?
参考
