Sigh...

And well you might. You're obviously finding this quite hard. Read back. No one suggested that the compiler should suddenly stop catering for all cases did they!

Prior to this recent change, both lvalue and rvalue uses--and yes, even your obscured, aliased lvalue assignment--worked just fine. And they didn't double or treble the size of small anonymous arrays in the process. But subsequent to this change, any reference to $#--lvalue or rvalue--has the immediate affect of adding magic to the array, regardless whether it is actually used!

My suggestion was that the application of magic be deferred until it is actually required--when it is used as an lvalue--rather than when it is first referenced. As ikegami has demonstrated, that is perfectly feasible to do.

The whole point about knowing which are the common cases, and which are the obscure--may only happen in golf and pointless demonstrations--cases, is that you optimise for the former, not the latter.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP PCW It is as I've been saying!(Audio until 20090817)

In reply to Re^11: Does @{ } copy arrays? by BrowserUk
in thread Does @{ } copy arrays? by tford

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.