It seems to me that you are viewing :lvalues as a C programmer would, something that behaves as a piece of memory. Wheras most people here are viewing lvalues as a VB or Java programmer would: disguised method calls. Maybe the solution is to provide both? I sure would like to have a way for 

$obj->method=$foo;

[download]
be the same as 
$obj->method($foo);

[download]

It would be nice if Perl automagically made 

$obj->method++;

[download]

be the same as 

$obj->method($obj->method()+1);

[download]

But it wouldn't bother me too much if it didn't.

The point here is that folk would be happy to forgo some of the more extreme uses of :lvalue subs like you and ysth post if they could just easily write validation code for the simpler cases. And we'd really like to do it in Perl 5. :-)

UPDATE: This was discussed in the CB and there seemed to be some agreement that there is room for the souped up, can do anything :lvalue as well as a more constrained :assignable version that has much simpler semantics. In fact it seems to me that the :assignable version could probably be implemented with :lvalue and better callbacks once Perl 6 is around tested and stable.

---
demerphq

In reply to Re^6: Experimenting with Lvalue Subs by demerphq
in thread Experimenting with Lvalue Subs by Limbic~Region

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.