Re: Constant attributes

On Wed, May 21, 2008 at 4:49 PM, Sartak <[email protected]> wrote:

> On 5/21/08, Bernardo Rechea <[email protected]> wrote:
>
> Hi Bernardo,
>
> > I wanted a constant attribute, i.e., one that is read-only and not
> settable
> >  at construction time.
>
> Does it have to be a full attribute? It could just be a method that
> returns a constant. I often have this in my classes:
>
> package Parent;
> use constant needs_trinket => 0;
>
> package Child;
> use constant needs_trinket => 1;


which can also be written:

sub needs_trinket () { 0 }
and
sub needs_trinket () { 1 }

perl optimizes things with empty prototypes that return a constant.

-Chris