Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Dear monks,

suppose I wanted to create a tied hash class that supported storing multiple values per each key. Internally, this can be implemented by storing all values in an array (keeping in mind situations where the user may want to store array references as well). However, when inserting new values into the hash, is it possible to force Perl to evaluate $hash{$key} = @values; as $hash->STORE($key, @values);?

If not, then the only two ways to insert multiple values at a time are

  1. $hash{$key} = $_ for @values
  2. $hash{$key} = \@values

The first option is a bit clumsy, and the latter won't work if you want to be able to store array references in the hash.

My gut feeling is that there is no way around this, as the tied hash interface is defined as STORE(this, key, value), and besides that, the assignment is always parsed in scalar context for hashes. (Right?)

One way around it might be using overloading and lvalue subroutines (i.e. $hash{$key} would be overloaded syntax for $hash->store($key), where store() is an lvalue subroutine), but that doesn't seem elegant or, in fact, even a possible solution.

print "Just Another Perl Adept\n";

In reply to Tied hashes: multiple parameters to STORE()? by vrk

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (4)
    As of 2018-01-22 07:28 GMT
    Find Nodes?
      Voting Booth?
      How did you see in the new year?

      Results (232 votes). Check out past polls.