Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

How do I get a reference to a builtin function?

( #65922=categorized question: print w/ replies, xml ) Need Help??
Contributed by adram on Mar 21, 2001 at 04:44 UTC
Q&A  > references


Description:

I would like to call a built-in function (in this case, uc) via a reference.
However, the following does not work.
(I suspect I'm not using the correct namespace for built-in functions.)

my %op = ( 'toupper' => \&uc, ... ); print $op{'toupper'}->($text);
I've tried UNIVERSAL::uc, CORE::uc, and CORE::GLOBAL::uc, but they all complain with something like (depending on the namespace I try to use):
Undefined subroutine &CORE::uc called at ...

Answer: How do I get a reference to a builtin function?
contributed by dws

I don't know of a way to do that. But perhaps you'd find the following solution acceptable: writing your own wrapper functions to which you can refer.

my %op = ( 'toupper' => sub { uc shift }, ... );

Answer: How do I get a reference to a builtin function?
contributed by igoryonya

I'd say:

my %op = ( 'toupper'=>sub{uc(@_)}, ... );
instead of shift

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others wandering the Monastery: (7)
    As of 2014-08-01 06:17 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (257 votes), past polls