Hi, here's an XS question this time regarding read-only variables...

In one of my "classes" my blessed thingy happens to be an HV which hold information about a distinguished name (canonical format, abbreviated, surname, given, common name, etc...).

i.e: print $name->{Common};

I'd like to be able to make that hash read-only and tried it (using SvREADONLY_on(HV)) but you can still do this:

$name->{valueNotInHashInitially} = "Some Value";

You can do that even though Devel::Peek show the hash as having the READONLY flag. I did set all the entries (SVs) in the hash to READONLY and that worked.

ie: $name->{Common} = "New Value"; raises an error and dies.

Is there anything I can do so Perl also raise the same error when a user tries to create new entries in my ReadOnly hash?

Thanks,

Christian Cloutier

In reply to XS ReadOnly HVs by Anonymous Monk

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.