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Re: How Constant pragma works with multi constants

by tobyink (Abbot)
on Feb 06, 2013 at 13:43 UTC ( #1017435=note: print w/ replies, xml ) Need Help??


in reply to How Constant pragma works with multi constants

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


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