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package Moose::Meta::Attribute::Native::Trait::Number;
use Moose::Role;
our $VERSION = '1.09';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
with 'Moose::Meta::Attribute::Native::Trait';
sub _helper_type { 'Num' }
# NOTE: we don't use the method provider for this module since many of
# the names of the provided methods would conflict with keywords - SL
has 'method_constructors' => (
is => 'ro',
isa => 'HashRef',
lazy => 1,
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::Role;
1;
=pod
=head1 NAME
Moose::Meta::Attribute::Native::Trait::Number - Helper trait for Num attributes
=head1 SYNOPSIS
package Real;
use Moose;
has 'integer' => (
traits => ['Number'],
is => 'ro',
isa => 'Num',
default => 5,
handles => {
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 PROVIDED METHODS
It is important to note that all those methods do in place modification of the
value stored in the attribute. These methods are implemented within this
package.
=over 4
=item B<set($value)>
Alternate way to set the value.
=item B<add($value)>
Adds the current value of the attribute to C<$value>.
=item B<sub($value)>
Subtracts C<$value> from the current value of the attribute.
=item B<mul($value)>
Multiplies the current value of the attribute by C<$value>.
=item B<div($value)>
Divides the current value of the attribute by C<$value>.
=item B<mod($value)>
Returns the current value of the attribute modulo C<$value>.
=item B<abs>
Sets the current value of the attribute to its absolute value.
=back
=head1 METHODS
=over 4
=item B<meta>
=item B<method_constructors>
=back
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Robert Boone
=head1 COPYRIGHT AND LICENSE
Copyright 2007-2009 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
|
