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    <p>If you have any shot of adding modules to use, try <a href="http://www.iinteractive.com/moose/" rel="noreferrer">Moose</a>. It provides pretty much all the features you'd want in a modern programming environment, and more. It does type checking, excellent inheritance, has introspection capabilities, and with <a href="http://search.cpan.org/perldoc?MooseX::Declare" rel="noreferrer">MooseX::Declare</a>, one of the nicest interfaces for Perl classes out there. Take a look:</p> <pre><code>use MooseX::Declare; class BankAccount { has 'balance' =&gt; ( isa =&gt; 'Num', is =&gt; 'rw', default =&gt; 0 ); method deposit (Num $amount) { $self-&gt;balance( $self-&gt;balance + $amount ); } method withdraw (Num $amount) { my $current_balance = $self-&gt;balance(); ( $current_balance &gt;= $amount ) || confess "Account overdrawn"; $self-&gt;balance( $current_balance - $amount ); } } class CheckingAccount extends BankAccount { has 'overdraft_account' =&gt; ( isa =&gt; 'BankAccount', is =&gt; 'rw' ); before withdraw (Num $amount) { my $overdraft_amount = $amount - $self-&gt;balance(); if ( $self-&gt;overdraft_account &amp;&amp; $overdraft_amount &gt; 0 ) { $self-&gt;overdraft_account-&gt;withdraw($overdraft_amount); $self-&gt;deposit($overdraft_amount); } } } </code></pre> <p>I think it's pretty cool, myself. :) It's a layer over Perl's object system, so it works with stuff you already have (basically.) </p> <p>With Moose, you can create subtypes really easily, so you can make sure your input is valid. Lazy programmers agree: with so little that has to be done to make subtypes work in Moose, it's easier to do them than not! (from <a href="http://search.cpan.org/~flora/Moose/lib/Moose/Cookbook/Basics/Recipe4.pod" rel="noreferrer">Cookbook 4</a>)</p> <pre><code>subtype 'USState' =&gt; as Str =&gt; where { ( exists $STATES-&gt;{code2state}{ uc($_) } || exists $STATES-&gt;{state2code}{ uc($_) } ); }; </code></pre> <p>And Tada, the USState is now a type you can use! No fuss, no muss, and just a small amount of code. It'll throw an error if it's not right, and all the consumers of your class have to do is pass a scalar with that string in it. If it's fine (which it should be...right? :) ) They use it like normal, and your class is protected from garbage. How nice is that!</p> <p>Moose has tons of awesome stuff like this.</p> <p>Trust me. Check it out. :)</p>
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    1. POSimulating aspects of static-typing in a duck-typed language
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    1. USRobert P
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    1. CO+1 for Moose :)
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    2. CODoes Moose have a way of turning $object->{member} into an error? I think that's what the OP wants.
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    3. COLook up MooseX::InsideOut. It should make $object->{member} invalid, while still being able to use all the antlered goodness described above.
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      1. USCurtis Jewell
 

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