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Re: Re: A new take on affordance.

by dsheroh (Prior)
on May 18, 2002 at 14:27 UTC ( #167508=note: print w/replies, xml ) Need Help??

in reply to Re: A new take on affordance.
in thread A new take on affordance.

A quick flip through the Camel didn't turn up anything on making truly private data, but the Coriolis Perl Black Book goes into a few tricks with closures to make your private data hard to get at. The ultimate point, though, was that anyone who knows which trick you used to hide the data can still get at it by throwing the right string of puctuation at your object.

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Re: Re: Re: A new take on affordance.
by Dog and Pony (Priest) on May 18, 2002 at 14:38 UTC
    In the third edition of the Camel book, it is to be found on page 339, Using Closures for Private Objects in chapter 12, Objects.

    I didn't personally look into it, but the authors of that book seems to think this method is a bit more secure than that...

    Perl offers low-level building blocks that you can use to surround your class and its objects with an impenetrable privacy shield - one stronger, in fact, than that found in many popular object-oriented languages.
    This is a very strong from of encapsulation; not only is it proof against external tampering, even other methods in the same class must use the proper access methods...
    What they are talking about is using a closure as the object itself, and they proceed to give some examples. Like I said, I didn't investigate, so those claims will have to stand for the authors themselves... *grin*. I'd say they should know, though. :)

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