如何在Perl中创建枚举类型？

从这个线程拉出来：Does Perl have an enumeration type?

use strict;

use constant {
    HOME   => 'home',WORK   => 'work',MOBILE => 'mobile',};

my $phone_number->{type} = HOME;
print "Enum: ".$phone_number->{type}."n";

但这不应该返回索引0吗？或者我理解这个错误？

编辑：

对于枚举类型,这样的事情会更令人期待吗？

use strict;

use constant {
    HOME   => 0,WORK   => 1,MOBILE => 2,};

my $phone_number->{type} = HOME;
print "Enum: ".$phone_number->{type}."n";

编辑#2

此外,我想验证所选的选项,但传回Word而不是值.我怎样才能充分利用这两个例子？

@VALUES = (undef,"home","work","mobile");

sub setValue {

if (@_ == 1) {
   # we're being set
   my $var = shift;
   # validate the argument
   my $success = _validate_constant($var,@VALUES);

   if ($success == 1) {
       print "Yeahn";
   } else {
       die "You must set a value to one of the following: " . join(",",@VALUES) . "n";
   }
}
}

sub _validate_constant {
# first argument is constant
my $var = shift();
# second argument is reference to array
my @opts = @{ shift() };

my $success = 0;
foreach my $opt (@opts) {
    # return true
    return 1 if (defined($var) && defined($opt) && $var eq $opt);
}

# return false
return 0;
}