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https://issues.apache.org/jira/browse/SANDBOX-224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12588131#action_12588131
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James Carman commented on SANDBOX-224:
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I don't have a problem with this change, but I am curious to see an actual use
case where this would be helpful.
> [functor] Parent interface for all functors
> -------------------------------------------
>
> Key: SANDBOX-224
> URL: https://issues.apache.org/jira/browse/SANDBOX-224
> Project: Commons Sandbox
> Issue Type: Improvement
> Components: Functor
> Environment: Operating System: All
> Platform: All
> Reporter: Brian D. Eubanks
> Priority: Minor
>
> Functor Enhancement: Parent interface for all functors
> I would like to see an empty Functor interface as a marker for all functors.
> This would be useful for storing functors in typed Maps, providing functor
> metadata lookup (e.g. parameters and return types), and passing functors
> generically as method parameters. It's an easy enhancement to make, and
> potentially very powerful.
> public interface Functor {}
> public interface Predicate extends Functor
> public interface UnaryPredicate extends Functor
> public interface BinaryPredicate extends Functor
> public interface Function extends Functor
> public interface UnaryFunction extends Functor
> public interface BinaryFunction extends Functor
> public interface Procedure extends Functor
> public interface UnaryProcedure extends Functor
> public interface BinaryProcedure extends Functor
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