package MooseX::AttributeHelpers::Number;
use Moose;
our $VERSION = '0.02';
our $AUTHORITY = 'cpan:STEVAN';
extends 'MooseX::AttributeHelpers::Base';
sub helper_type { 'Num' }
# NOTE:
# we don't use the method provider for this
# module since many of the names of the provied
# methods would conflict with keywords
# - SL
has '+method_constructors' => (
default => sub {
return +{
set => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], $_[1]) };
},
add => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], $reader->($_[0]) + $_[1]) };
},
sub => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], $reader->($_[0]) - $_[1]) };
},
mul => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], $reader->($_[0]) * $_[1]) };
},
div => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], $reader->($_[0]) / $_[1]) };
},
mod => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], $reader->($_[0]) % $_[1]) };
},
abs => sub {
my ($attr, $reader, $writer) = @_;
return sub { $writer->($_[0], abs($reader->($_[0])) ) };
},
}
}
);
no Moose;
# register the alias ...
package # hide me from search.cpan.org
Moose::Meta::Attribute::Custom::Number;
sub register_implementation { 'MooseX::AttributeHelpers::Number' }
1;
=pod
=head1 NAME
MooseX::AttributeHelpers::Number
=head1 SYNOPSIS
package Real;
use Moose;
use MooseX::AttributeHelpers;
has 'integer' => (
metaclass => 'Number',
is => 'ro',
isa => 'Int',
default => sub { 5 },
provides => {
set => 'set',
add => 'add',
sub => 'sub',
mul => 'mul',
div => 'div',
mod => 'mod',
abs => 'abs',
}
);
my $real = Real->new();
$real->add(5); # same as $real->integer($real->integer + 5);
$real->sub(2); # same as $real->integer($real->integer - 2);
=head1 DESCRIPTION
This provides a simple numeric attribute, which supports most of the
basic math operations.
=head1 METHODS
=over 4
=item B<meta>
=item B<helper_type>
=item B<method_constructors>
=back
=head1 PROVIDED METHODS
It is important to note that all those methods do in place
modification of the value stored in the attribute.
=over 4
=item I<set ($value)>
Alternate way to set the value.
=item I<add ($value)>
Adds the current value of the attribute to C<$value>.
=item I<sub ($value)>
Subtracts the current value of the attribute to C<$value>.
=item I<mul ($value)>
Multiplies the current value of the attribute to C<$value>.
=item I<div ($value)>
Divides the current value of the attribute to C<$value>.
=item I<mod ($value)>
Modulus the current value of the attribute to C<$value>.
=item I<abs>
Sets the current value of the attribute to its absolute value.
=back
=head1 BUGS
All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.
=head1 AUTHOR
Robert Boone
=head1 COPYRIGHT AND LICENSE
Copyright 2007 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut