#!/usr/bin/perl
package Hash::AsObj;
my %sub_class;
sub new {
my $class = shift;
my $href = { @_ };
my $sub_class;
# Keep hashes with the same set of keys in
# the same package
my $class_key = join "~", sort keys %$href;
if ( exists $sub_class{$class_key} ) {
$sub_class = $sub_class{$class_key};
} else {
( $sub_class = "$href" ) =~ tr/()/__/;
$sub_class{$class_key} = $sub_class;
}
@{"${class}::Data::${sub_class}::ISA"} = "Hash::AsObj::Data";
bless $href, "${class}::Data::$sub_class";
}
package Hash::AsObj::Data;
use Carp ();
sub DESTROY { 1 }
sub AUTOLOAD : lvalue {
my ( $class, $method ) = $AUTOLOAD =~ /^(.*)::(.+)$/
or Carp::croak "Invalid call to $AUTOLOAD";
Carp::croak "Can't locate object method $method via package $class"
unless exists $_[0]->{$method};
*$AUTOLOAD = sub : lvalue {
my $self = shift;
if (@_) {
$self->{$method} = shift;
return $self;
}
$self->{$method};
};
goto &$AUTOLOAD;
$Hash::AsObj::foo;
}
package main;
use strict;
use warnings;
my $hobj = Hash::AsObj->new( a=>1, b=>2, c=>3 ,e=>5 );
print $hobj->a, "\n";
# It's an lvalue method!
$hobj->a++;
print $hobj->a, "\n";
# Or supply an argument to set values
# I like method chaining - Your opinion may differ
$hobj
->b(5)
->c(6);
print "b: ", $hobj->b, " c:", $hobj->c, "\n";
# Error - this key doesn't exist
print $hobj->d;
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