Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Comment on

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

constant.pm is pretty crufty by now, but here's a "clean-room implementation" of the same sort of idea...

use v5.12; use warnings; BEGIN { package MyConstant; $INC{'MyConstant.pm'} = __FILE__; sub import { my $caller = caller; my $class = shift; if (@_ == 1 and ref $_[0] eq 'HASH') { while (my ($key, $value) = each %{$_[0]}) { $class->_define($caller, $key, $value); } } else { $class->_define($caller, @_); } } sub _define { my $class = shift; my ($caller, $name, @values) = @_; my $code; if (@values == 1) { my $v = $values[0]; $code = sub () { $v }; } else { $code = sub () { @values }; } no strict 'refs'; *{"$caller\::$name"} = $code; } } use MyConstant { FOO => 4, BAR => 2, }; say FOO . BAR;
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: How Constant pragma works with multi constants by tobyink
in thread How Constant pragma works with multi constants by manorhce

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!
  • 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 about the Monastery: (4)
    As of 2014-09-24 00:29 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (243 votes), past polls