That's what Var::Pairs is for!

#!/usr/bin/env perl

use strict;
use warnings;
use Var::Pairs;

my %hash = (foo => 1, bar => 2);

for my $pair1 (pairs %hash) {
    for my $pair2 (pairs %hash) {
        printf "%s %s\n", $pair1, $pair2;
    }
}

__END__
bar => 2 bar => 2
bar => 2 foo => 1
foo => 1 bar => 2
foo => 1 foo => 1

[download]

Sadly it uses Data::Alias which is currently broken on Perl 5.18.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: Indepedent lazy iterators for the same hash? by tobyink
in thread Indepedent lazy iterators for the same hash? by LanX

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.