From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-06-03T07:54:51+09:00
Subject: Re: Implementing a Read-Only array

--8323328-1709284869-1117752889=:2568
Content-Type: MULTIPART/MIXED; BOUNDARY="8323328-1709284869-1117752889=:2568"

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.

--8323328-1709284869-1117752889=:2568
Content-Type: TEXT/PLAIN; charset=X-UNKNOWN; format=flowed
Content-Transfer-Encoding: QUOTED-PRINTABLE

On Fri, 3 Jun 2005, Gavin Kistner wrote:

> On Jun 2, 2005, at 11:22 AM, Brian Schr=F6der wrote:
>> Just playing devils advocate here, but if you care about user added
>> methods, the user may also add something that acts in effekt like
>>=20
>> class Array
>>   def mutate(i, v)
>>     self[i] =3D v
>>   end
>> end
>
> Duly noted and understood.
>
> However...if I've undef'd #[]=3D, then that won't work, right?
>
>
> irb(main):003:0> class Array; def mutate(i,v); self[i]=3Dv; end; end
>
> irb(main):004:0> a =3D []
>
> irb(main):005:0> class << a; undef_method( :'[]=3D' ); end
>
> irb(main):008:0> a[0] =3D 0
> NoMethodError: undefined method `[]=3D' for []:Array
>        from (irb):8
>
> irb(main):009:0> a.mutate(0,0)
> NoMethodError: undefined method `[]=3D' for []:Array
>        from (irb):2:in `mutate'
>        from (irb):9

but that means that not even you can mutate it.  if not even you can mutate=
 it
why not just use Object#freeze?

-a
--=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
| email :: ara [dot] t [dot] howard [at] noaa [dot] gov
| phone :: 303.497.6469
| My religion is very simple.  My religion is kindness.
| --Tenzin Gyatso
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D

--8323328-1709284869-1117752889=:2568--
--8323328-1709284869-1117752889=:2568--