#!/apps/perl/5.8.3/bin/perl -w

use strict;

### PACKAGE ###
package Register;
sub new {
    my ($class) = @_;
    my $self = {
       _regName             => undef,
       _regID               => undef,
    };
    bless $self, $class;
    return $self;
}
sub regName {
    my ( $self, $regName ) = @_;
    $self->{_regName} = $regName if defined($regName);
    return $self->{_regName};
}
sub regID {
    my ( $self, $regID ) = @_;
    $self->{_regID} = $regID if defined($regID);
    return $self->{_regID};
}
sub print {
   my ($self) = @_;
   if (defined $self->regName)        { printf ("%s\n",$self->regName)      };
   if (defined $self->regID)          { printf ("%s\n",$self->regID)        };
}
###################


my @Regs;
$Regs[0] = new Register();  
$Regs[1] = new Register();  

$Regs[0]->regName("CLKEN");    
$Regs[0]->regID("REG3456");
$Regs[1]->regName("IRQEN");    
$Regs[1]->regID("REG4444");

# I want to access the register based on regName and dont want to 
# search the array each time for my register. So make a hash as follows
my %reg_hash;
foreach my $reg (@Regs) {
   $reg_hash{$reg->regName()} = [] unless exists $reg_hash{$reg->regName()};
   push @{$reg_hash{$reg->regName()}}, $reg;
}

# now to access a register object from the hash
my $curr_reg;
$curr_reg = new Register();  
$curr_reg = \$reg_hash{IRQEN};
$curr_reg->print;  # ERROR!! Can't call method "regID" on unblessed reference at ./hash_of_objects.pl line 54

$curr_reg = $Regs[0];
$curr_reg->print;  # This line is ok, but seems the same to me ?

1;