use Perl

• Is it a bug or a feature? (Score:1)

  by nxadm (8942)

  Not completely into Moose yet, but isn't a role the equivalent of a Java interface?

  In that case, the behaviour you describe has been implemented there as a intended feature: a regular class *implements* the interface.

  Additionally, a role seems to also have the function of an abstract class as well. In Java, overriding concrete methods is, again, a feature you want.

  If you don't want to override a method simply do not include a overloading method in the implementing class.

  It looks like a (sensible) design dec
  • Re: (Score:2)

    by Ovid (2709)

    Roles are far more than interfaces. I strongly recommend reading up on them to understand what they do. The protect (usually) against method collision and they provide a default implementation. If you want to use one like an interface, it's simple:

    package MyRole::DoesSomething;
    
    use Moose::Role;
    requires qw(
        save
        search
    );

    And now your classes (or some other role composed into said classes) must provide save and search methods.

    However, if you have this:

    package MyRole::DoesSomethi
    • Re: (Score:1)

      by nxadm (8942)

      So it's indeed also like an Abstract class in Java. The solution for the problem in the Java world is the @Override annotation before the overriding method.

      It overrides silently, but it's clear in your code and your IDE will warn you if you don't add the @Override annotation.

      Something like that would indeed save debugging time.

      C.
      • Re:Is it a bug or a feature? (Score:1)

        by chromatic (983) on 2009.04.14 12:54 (#68115) Homepage Journal

        So it's indeed also like an Abstract class in Java.

        A role is like an abstract class in Java in the same way lightning is like a lightning bug.

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