鐃緒申鐃緒申鐃緒申鐃�!

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Advanced Perl Programming, 2nd Ed.
 Simon Cozens
[邦鐃緒申:鐃緒申鐃緒申Perl鐃竣ワ申鐃緒申鐃緒申潺鐃緒申鐃�2鐃緒申]
naoya鐃緒申鐃暑ー鐃緒申 - naoya鐃緒申鐃緒申鐃緒申 - Perl 鐃緒申 Singleton Method
鐃夙わ申鐃緒申鐃緒申鐃夙わ申 Class::SingletonMethod 鐃淳わ申鐃緒申鐃祝ワ申鐃初ス名鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申磴�鐃処う鐃緒申鐃緒申法鐃淑鰹申鐃緒申 Singleton Method (鐃獣異メソ鐃獣ワ申) 鐃緒申存鐃緒申鐃緒申鐃緒申鐃祝￥申呂覆鐃緒申鐃緒申覆鐃緒申鐃�

鐃緒申鐃緒申鐃叔件申命鐃淑ヒョウ鐃緒申(鐃緒申鐃獣てなわ申鐃粛は上か鐃緒申鐃緒申辰討鐃緒申鐃緒申泙鐃�)鐃緒申鐃宿者は￥申鐃緒申鐃緒申鐃竣わ申鐃縦わ申鐃夙思わ申鐃塾わ申鐃緒申鐃宿￥申

package Object::SingletonMethod;

use 5.008001;
use strict;
use warnings;
use Carp;
use Data::Dumper;

our $VERSION = '0.01';
our $DEBUG   = 1;

my %Method;

sub singleton_method {
    my $self = shift;
    my ( $method, $subref ) = @_;
    ref $subref eq 'CODE'
      or croak '$obj->singleton_method(name => sub{...})';
    $Method{ $self + 0 }{$method} = $subref;

}

sub can {
    my ( $self, $method ) = @_;
    my $subref = $Method{ $self + 0 }{$method};
    return $subref if $subref;
    return $self->SUPER::can($method);
}

sub DESTROY {
    my $self = shift;
    $DEBUG and carp "Destroing $self";
    delete $Method{ $self + 0 };
}

sub AUTOLOAD {
    my $self   = shift;
    my $method = our $AUTOLOAD;
    $method =~ s/.*:://;
    $DEBUG and carp "($self)->$method";
    if ( my $subref = $Method{ $self + 0 }{$method} ) {
        $subref->( $self, @_ );
    }
    else {
        my $pkg = ref $self;
        croak qq(Can't locate object method "$method" via package "$pkg");
    }
}

1;
__END__

鐃淑駕申鐃叔実証￥申

#
use strict;
use warnings;
use Data::Dumper();

package Foo;
use base 'Object::SingletonMethod';

sub new {
    my $class = shift;
    bless {@_} => $class;
}
sub dump{
    my $self = shift;
    local ($Data::Dumper::Terse) = 1;
    return Data::Dumper::Dumper($self);
}

package main;

my $foo = Foo->new;
my $far = Foo->new;

$foo->singleton_method(
    inc => sub {
        my $self = shift;
        $self->{_inc}++;
        $self;
    }
);

$foo->inc;
$foo->inc;
print "foo can inc? ", ( $foo->can('inc') ? "Yes" : "No" ), "\n";
print "foo can new? ", ( $foo->can('new') ? "Yes" : "No" ), "\n";
print "foo can pee? ", ( $foo->can('pee') ? "Yes" : "No" ), "\n";
print "far can inc? ", ( $far->can('inc') ? "Yes" : "No" ), "\n";
print "far can new? ", ( $far->can('new') ? "Yes" : "No" ), "\n";
print "far can pee? ", ( $far->can('pee') ? "Yes" : "No" ), "\n";
print $foo->dump;
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Perl Best Practices
Damian Conway

鐃渋はわ申鐃緒申鐃緒申鐃緒申鐃�my variable鐃緒申$object + 0鐃薯キ￥申鐃祝わ申鐃銃ワ申鐃藷スワ申鐃藷スをしまわ申鐃緒申鐃緒申箸鐃緒申鐃緒申鐃祝￥申蓮鐃�Inside-Out Object鐃夙呼ばわ申襦�鐃緒申鐃重�鐃緒申鐃緒申鐃緒申Perl鐃緒申Object鐃緒申鐃緒申法鐃叔￥申鐃緒申鐃緒申鐃�Damian流鐃緒申徹鐃緒申的鐃祝常申鐃准わ申鐃緒申鐃緒申鐃塾わ申Class::Std鐃緒申鐃緒申鐃曙、鐃緒申鐃縦わ申鐃旬細駕申鐃緒申(鐃縦￥申鐃緒申添鐃緒申!)鐃緒申鐃緒申弔鐃緒申鐃緒申鐃緒申鼻鐃緒申圓討覆鐃緒申佑魯鐃緒申鵐哀董鐃緒申鐃淑ワ申鐃緒申棧鐃緒申鬚犬辰鐃緒申蠅�鐃宿みわ申鐃曙。

Dan the Man with Too Many Ways to Do Too Many Things