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All the Perl that's Practical to Extract and Report

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Trying to implement runtime traits 2 Comments More | Login | Reply /

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  • Applying several traits to an instance should not do anything different than applying one. So for instance this (in pseudo Perl 6):

    $fido does Tricks does Treats;

    Would become this (in Perl 5 Traits):

    Treats->apply(Tricks->apply($fido));

    Basically apply should return the reblessed instance, and you just keep chaining them.

    Now, this may not be the most efficient approach, but I am not really sure that would matter since runtime application of multiple traits will probably be a rare occuranc

    • The better way to accomplish this (IMO of course) is to compose a third Trait out of the multiple traits you have applied, then apply that third trait to your instance.

      I think that’s the key to a bearable syntax: have a Class::Traits::compose, returning an anonymous trait which is a composition of the given traits, on which you then simply invoke apply:

      Class::Traits->compose( "Tricks", "Treats" )->apply( $fido );

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