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xsawyerx (8978)

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Journal of xsawyerx (8978)

Tuesday July 21, 2009
09:47 AM

Incrementing an attribute

[ #39328 ]

Isn't there anything better than this?

    $self->num( $self->num + 1 );


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  • If you're using Moose, MooseX::AttributeHelpers [] has a Counter helper that will give you increment_num and decrement mutators:

    use MooseX::AttributeHelpers;

    has num => (
      metaclass => 'Counter',
      isa       => 'Num',
      is        => 'ro',
      provides  => {
        inc => 'inc_num',
        dec => 'dec_num',
        reset => 'reset_num',

    my $thing = Foo->new(num => 26);

  • Makes me thankful there's Rakudo/Perl6, in which none of this is necessary.