Hash::Type 1.05

Hash::Type module contains pseudo-hashes as arrays tied to a "type" (list of fields).

SYNOPSIS

use Hash::Type;

# create a Hash::Type
my $personType = new Hash::Type(qw(firstname lastname city));

# create and populate some hashes tied to $personType
tie %wolfgang, $personType, "wolfgang amadeus", "mozart", "salzburg";
$ludwig = new $personType ("ludwig", "van beethoven", "vienna");
$jsb = new $personType;
$jsb->{city} = "leipzig";
@{$jsb}{qw(firstname lastname)} = ("johann sebastian", "bach");

# add fields dynamically
$personType->add("birth", "death") or die "fields not added";
$wolfgang{birth} = 1750;

# More complete example : read a flat file with headers on first line
my ($headerline, @datalines) = map {chomp; $_} ;
my $ht = new Hash::Type(split /t/, $headerline);
foreach my $line (@datalines) {
my $data = new $ht(split /t/, $line);
work_with($data->{someField}, $data->{someOtherField});
}

# an alternative to Time::gmtime and Time::localtime
my $timeType = new Hash::Type qw(sec min hour mday mon year wday yday);
my $localtime = new $timeType (localtime);
my $gmtime = new $timeType (gmtime);
print $localtime->{hour} - $gmtime->{hour}, " hours difference to GMT";

# comparison functions
my $byAge = $personType->cmp("birth : -num, lastname, firstname");
my $byNameLength = $personType->cmp(lastname => {length($b) <=> length($a)},
lastname => alpha,
firstname => alpha);
showPerson($_) foreach (sort $byAge @people);
showPerson($_) foreach (sort $byNameLength @people);

# special comparisons : dates
my $US_DateCmp = $myHashType->cmp("someDateField : m/d/y");
my $FR_InverseDateCmp = $myHashType->cmp("someDateField : -d.m.y");