You need to create tied hashes on each level. For instance: 
#!/usr/bin/perl
    
use strict;
use warnings;
    
use Tie::IxHash;

my @entries = ([qw /alice aaa time 20:00:00/],
               [qw /john  ccc time 21:00:00/],
               [qw /alice www time 22:00:00/],
               [qw /john  aaa time 23:00:00/],
               [qw /andy  xxx time 24:00:00/],
               [qw /alice bbb time 25:00:00/],   
               [qw /andy  yyy time 26:00:00/],   
              );
     
my %HoHoH;

tie %HoHoH => 'Tie::IxHash';
 
foreach my $entry (@entries) {
    my ($key1, $key2, $key3, $value) = @$entry;

    tie %{$HoHoH {$key1}} => 'Tie::IxHash' unless exists $HoHoH {$key1
+};
    tie %{$HoHoH {$key1} {$key2}}
                          => 'Tie::IxHash' unless exists $HoHoH {$key1
+} {$key2};

    $HoHoH {$key1} {$key2} {$key3} = $value;  
}
               
while (my ($key1, $val1) = each %HoHoH) {
    while (my ($key2, $val2) = each %$val1) { 
        while (my ($key3, $val3) = each %$val2) {
            print "$key1 $key2 $key3 -> $val3\n";
        }
    }
}

__END__
alice aaa time -> 20:00:00
alice www time -> 22:00:00
alice bbb time -> 25:00:00
john ccc time -> 21:00:00
john aaa time -> 23:00:00
andy xxx time -> 24:00:00
andy yyy time -> 26:00:00

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Abigail

In reply to Re: HoHoH Insertion Order by Abigail-II
in thread HoHoH Insertion Order by Anonymous Monk

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