Two dimensional array of integers? Smells like C... :-)

package Array2D;

use strict;
use Carp;
use constant sizeof_int => length pack 'i', 1337;

sub new {
    my $class = shift;
    @_ == 2 or croak
        "must call ${class}::new with x, y dimensions";
    my ($dx, $dy) = @_;
    $dx > 0 && $dy > 0
        or croak "${class}::new : illegal x, y dimensions";

    bless {
           dx => $dx,
           dy => $dy,
           buf => "\0" x ($dx * $dy * sizeof_int)
          }, $class;
}

sub get {
    my $ary = shift;
    my $class = ref $ary;
    @_ == 2 or croak
        "must call ${class}::get with x, y positions";
    my ($x, $y) = @_;
    my ($dx, $dy) = @{$ary}{qw/dx dy/};

    $x >= 0 && $y >= 0 && $x < $dx && $y < $dy
        or croak "${class}::get : subscripts out of range";

    unpack 'i', substr (
                        $ary->{buf},
                        ($x + $y * $dx) * sizeof_int,
                        sizeof_int );
}

sub set {
    my $ary = shift;
    my $class = ref $ary;
    @_ == 3 or croak
        "must call ${class}::get with x, y positions and new value";
    my ($x, $y, $val) = @_;
    my ($dx, $dy) = @{$ary}{qw/dx dy/};

    $x >= 0 && $y >= 0 && $x < $dx && $y < $dy
        or croak "${class}::set : subscripts out of range";

    substr (
            $ary->{buf},
            ($x + $y * $dx) * sizeof_int,
            sizeof_int,
            pack 'i', $val
           );
    ();
}

1;
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