kikuchiyo:

No, it's letting you sort by the address, as you mention. So it's giving you the creation order instead of the insertion order.

#!/usr/bin/perl

use strict;
use warnings;
use feature qw/say/;

my %hoh = (
        foo => { value => 'first' },
        bar => { value => 'second' },
        baz => { value => 'third' },
);

my %h2;
$h2{first} = $hoh{baz};
$h2{second} = $hoh{foo};
$h2{third} = $hoh{bar};

for my $elem (sort values %h2) {
        say "value => " . $elem->{value};
}

[download]

Here, I'm inserting the same items into another hash in a different order, yet it returns the same order as the first.

$ perl p.pl
value => first
value => second
value => third

[download]

The creation order isn't guaranteed, either. Once you start adding and deleting objects over a longer time period, deleted chunks of memory can be reused later breaking the correlation of address and creation time.

...roboticus

When your only tool is a hammer, all problems look like your thumb.

In reply to Re: Hashes do preserve insertion order after all by roboticus
in thread Hashes do preserve insertion order after all by kikuchiyo

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