diff -r 000000000000 -r f65c3dd5742a lib/Scalar/RefType.pm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Scalar/RefType.pm	Tue Jul 29 12:17:35 2014 +0200
@@ -0,0 +1,50 @@
+package Scalar::RefType;
+use strict;
+use warnings;
+use Carp;
+
+our $VERSION = '0.01';
+
+sub TIESCALAR {
+    my ($class, $type) = @_;
+    return bless { value => undef, type => ref $type ? ref $type : $type // '' };
+}
+
+sub FETCH { return $_[0]->{value} }
+
+sub STORE {
+    my ($self, $value) = @_;
+    my $ref = ref $value // '';
+    if ($ref ne $self->{type}) {
+	croak 'invalid reference type';
+    }
+    return $self->{value} = $value;
+}
+
+__END__
+
+=head1 NAME
+
+ Scalar::RefType - simple scalar type checker
+
+=head1 SYNOPSIS
+
+ use Scalar::RefType;
+
+ tie my $h1 => 'Scalar::RefType', {};
+ tie my $h2 => 'Scalar::RefType', 'HASH';
+
+ # dies:
+ $h1 = [];
+
+=head1 DESCRIPTION
+
+This little module allows you to tie the type of a scalar to a specified
+reference type. If the refererence type of an assignment violetes the 
+tied type, the assignment throws an exception.
+
+=head1 AUTHOR
+
+Heiko Schlittermann <hs@schlittermann.de>
+
+=cut