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|
=head1 NAME
Class::MakeMethods::Template::Ref - Universal copy and compare methods
=head1 SYNOPSIS
package MyObject;
use Class::MakeMethods::Template::Ref (
'Hash:new' => [ 'new' ],
clone => [ 'clone' ]
);
package main;
my $obj = MyObject->new( foo => ["Foozle", "Bozzle"] );
my $clone = $obj->clone();
print $obj->{'foo'}[1];
=cut
package Class::MakeMethods::Template::Ref;
$VERSION = 1.008;
use strict;
require 5.00;
use Carp;
use Class::MakeMethods::Template '-isasubclass';
use Class::MakeMethods::Utility::Ref qw( ref_clone ref_compare );
######################################################################
=head1 DESCRIPTION
The following types of methods are provided via the Class::MakeMethods interface:
=head2 clone
Produce a deep copy of an instance of almost any underlying datatype.
Parameters:
init_method
If defined, this method is called on the new object with any arguments passed in.
=cut
sub clone {
{
'params' => { 'init_method' => '' },
'interface' => {
default => 'clone',
clone => { '*'=>'clone', },
},
'behavior' => {
'clone' => sub { my $m_info = $_[0]; sub {
my $callee = shift;
ref $callee or croak "Can only copy instances, not a class.\n";
my $self = ref_clone( $callee );
my $init_method = $m_info->{'init_method'};
if ( $init_method ) {
$self->$init_method( @_ );
} elsif ( scalar @_ ) {
croak "No init_method";
}
return $self;
}},
},
}
}
######################################################################
=head2 prototype
Create new instances by making a deep copy of a static prototypical instance.
Parameters:
init_method
If defined, this method is called on the new object with any arguments passed in.
=cut
sub prototype {
( {
'interface' => {
default => { '*'=>'set_or_new', },
},
'behavior' => {
'set_or_new' => sub { my $m_info = $_[0]; sub {
my $class = shift;
if ( scalar @_ == 1 and UNIVERSAL::isa( $_[0], $class ) ) {
# set
$m_info->{'instance'} = shift
} else {
# get
croak "Prototype is not defined" unless $m_info->{'instance'};
my $self = ref_clone($m_info->{'instance'});
my $init_method = $m_info->{'init_method'};
if ( $init_method ) {
$self->$init_method( @_ );
} elsif ( scalar @_ ) {
croak "No init_method";
}
return $self;
}
}},
'set' => sub { my $m_info = $_[0]; sub {
my $class = shift;
$m_info->{'instance'} = shift
}},
'new' => sub { my $m_info = $_[0]; sub {
my $class = shift;
croak "Prototype is not defined" unless $m_info->{'instance'};
my $self = ref_clone($m_info->{'instance'});
my $init_method = $m_info->{'init_method'};
if ( $init_method ) {
$self->$init_method( @_ );
} elsif ( scalar @_ ) {
croak "No init_method";
}
return $self;
}},
},
} )
}
######################################################################
=head2 compare
Compare one object to another.
B<Templates>
=over 4
=item *
default
Three-way (sorting-style) comparison.
=item *
equals
Are these two objects equivalent?
=item *
identity
Are these two references to the exact same object?
=back
=cut
sub compare {
{
'params' => { 'init_method' => '' },
'interface' => {
default => { '*'=>'compare', },
equals => { '*'=>'equals', },
identity => { '*'=>'identity', },
},
'behavior' => {
'compare' => sub { my $m_info = $_[0]; sub {
my $callee = shift;
ref_compare( $callee, shift );
}},
'equals' => sub { my $m_info = $_[0]; sub {
my $callee = shift;
ref_compare( $callee, shift ) == 0;
}},
'identity' => sub { my $m_info = $_[0]; sub {
$_[0] eq $_[1]
}},
},
}
}
######################################################################
=head1 SEE ALSO
See L<Class::MakeMethods> for general information about this distribution.
See L<Class::MakeMethods::Template> for more about this family of subclasses.
See L<Class::MakeMethods::Utility::Ref> for the clone and compare functions used above.
=cut
######################################################################
1;
|
