Why would it not be sufficient to just make it clear in your module's POD that direct access to object-internal values is strongly discouraged, and that the get() and set() methods should always be used? Are you really expecting that end-users would deliberately set out to do things that are bad for them?

A common convention that is used to reinforce this "social engineering" aspect of perl 5's OO is to prefix your "internal" variable names with an underscore character ("_atr1", "_atr2", etc).

If you don't have Damian Conway's fine book, Objected Oriented Perl, you should get a copy. Chapter 11, "Encapsulation", explains what you need to know and do to use closures inside your classes so that direct access is effectively ruled out. I'm no expert on this myself, and it would take me a while to demonstrate -- perhaps another monk will step in...

In reply to Re: Prevent direct acces to object's attributes by graff
in thread Prevent direct acces to object's attributes by vitoco

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.