Firstly…

Class::Tiny::Antlers

Whaaaaat?!?! One of my modules is referenced by the core Perl documentation? How did that happen?!

Secondly, the Moose example could be simplified quite a bit. I feel you're making it deliberately verbose by not using sub signatures for example.

package Cache::LRU {
    use Hash::Ordered;
    use Moose;
    use MooseX::Types::Common::Numeric qw/PositiveOrZeroInt/;
    use namespace::autoclean;

    has '_cache' => (
        is      => 'ro',
        isa     => 'Hash::Ordered',
        default => sub { Hash::Ordered->new },
    );

    has 'max_size' => (
        is      => 'ro',
        isa     => PositiveOrZeroInt,
        default => 20,
    );

    sub set ($self, $key, $value) {
        if ( $self->_cache->exists($value) ) {
            $self->_cache->delete($value);
        }
        elsif ( $self->_cache->keys > $self->max_size ) {
            $self->_cache->shift;
        }
        $self->_cache->set( $key, $value );
    }

    sub get ($self, $key) {
        return unless $self->_cache->exists($key);
        return $self->_cache->set( $key, $self->_cache->delete($key) )
+;
    }

    __PACKAGE__->meta->make_immutable;
}
[download]

Still more verbose than your proposed syntax, but not as bad as it was. Also, if you used Moo, you could avoid the make_immutable stuff because the constructor automatically immutablizes the class the first time it gets called.

To be honest, Moose seems verbose because this is such a simple class. It means that boilerplate imports and stuff starts taking up a significant portion of the class. In a longer class with more methods, the difference would be a lot less pronounced.

I'mma give a Mew example because Mew is kinda cool.

package Cache::LRU {
    use Hash::Ordered;
    use Mew;

    has _cache   => InstanceOf['Hash::Ordered'], (default => sub { Has
+h::Ordered->new });
    has max_size => PositiveOrZeroInt,           (default => 20);

    sub set ($self, $key, $value) {
        if ( $self->_cache->exists($value) ) {
            $self->_cache->delete($value);
        }
        elsif ( $self->_cache->keys > $self->max_size ) {
            $self->_cache->shift;
        }
        $self->_cache->set( $key, $value );
    }

    sub get ($self, $key) {
        return unless $self->_cache->exists($key);
        return $self->_cache->set( $key, $self->_cache->delete($key) )
+;
    }
}
[download]

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