From: "Shot (Piotr Szotkowski)" <shot@...>
Date: 2009-11-19T23:35:38+09:00
Subject: Re: dynamic array?

--oyUTqETQ0mS9luUI
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

Freak Guard:

> class DefaultArray < Array

>   attr_accessor :default_value

>   def initialize
>     super
>     @default_value =3D nil
>   end

>   def [](idx)
>     super || @default_value
>   end
> end

> ... and writing all the iterators I need

You can always delegate them (or, as
suggested, reopen Array or extend it).

> which will be dead slow I assume :/

Don=E2=80=99t assume, benchmark it (it=E2=80=99s fairly trivial to do).

You can see the following thread for inspiration =E2=80=93 and
an example when a Hash-based custom set is (or at least
seems to be) sometimes faster than the underlying Hash:
http://groups.google.com/group/ruby-talk-google/browse_thread/thread/478a5d=
dded16da09

=E2=80=94 Shot
--=20
If you program and want any longevity to your work, make a game. All
else recycles, but people rewrite architectures to keep games alive.
                                                              [_why]

--oyUTqETQ0mS9luUI
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAksFV6YACgkQi/mCfdEo8UqE0wCgnN2OPoQ6OHvY0jpAY+YmlCMp
uQUAn1vyhNuqBj3IIUwndCiVb+LkpWHM
=DdZ/
-----END PGP SIGNATURE-----

--oyUTqETQ0mS9luUI--