No, I had two points neither of which I elaborated. The first is that perl is likely going to find all sorts of funny places to copy the data and I wonder how likely it is to find all of them. I also wonder, does the current implementation of perl call sv_free at the proper time to support the wishes of the requestor? There's that pesky difference between something going out of scope-being-freed and the actually, really being freed, perhaps after having undef() called on it.

The second point is that anything that attempts to clear the memory is going to have to do something compiler/version specific to hint to that the otherwise useless operation has a side effect and that it shouldn't be optimized away. You could consider it this way - some compilers take something like sub foo { my $bar = 1; return 0 }, notice that the my $bar = 1 doesn't affect anything else and just eliminate it. That'd be C code though so the perl is just an example. I don't speak C well enough to produce a proper example.

In reply to Re: Re: Re: Re: Re: making perl more forgetting by diotalevi
in thread making perl more forgetting by ddzeko

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.