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An interesting discussion would be the differences between this and Inside-out classes. Both are based on lexical scoping to enforce encapsulation. What are the benefits/drawbacks of either method?

Off the top of my head:

  • You don't have to mess around with DESTROY with the closure based method, which makes maintenance easier.
  • Inside out objects are more space efficient than closures.
  • Accessing object state is a subroutine call with closure objects, and a hash access with inside-out objects. The latter will be a fair bit faster.
  • You can subclass an existing non-inside-out object and add inside-out based state to the objects in the subclass. You can't do this with without delegation with closures.
  • You need a bit more mechanism than the proposal hardburn showed above to get separate namespaces for state in different subclasses. This comes for free with inside-out.
  • You don't get compile-time checking of your instance variable naming with closures.
  • added 16:58 GMT+1:Inside out instance variables are scoped to the class they are declared in. With the mechanism outlined in the OP instance variables can also be accessed in subclasses.

In reply to Re^2: May Thy Closures Be Blessed by adrianh
in thread May Thy Closures Be Blessed by hardburn

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