From: Robert Klemme <bob.news@...>
Date: 2004-08-19T18:05:54+09:00
Subject: Re: POT (partly offtopic) Re: Q: Shifting a hash anf and array


"Meino Christian Cramer" <Meino.Cramer@gmx.de> schrieb im Newsbeitrag
news:20040819.092154.74751728.Meino.Cramer@gmx.de...
> From: "Robert Klemme" <bob.news@gmx.net>
> Subject: Re: POT (partly offtopic) Re: Q: Shifting a hash anf and array
> Date: Wed, 18 Aug 2004 19:10:56 +0900
>
> Hi Robert, Hi Rubyaner ! :)
>
>  Enigma is growing. Currently it does scrambling text. Unfortunately
>  it is an absolut safe encyphiering algorithm at the moment...there is
>  NO way back to the clear text...even for the sender. Or to call it
>  more realistic: Enigma is currently still a little buggy :)
>
>  With the real Enigma you could change the wheels (or "rotors"). Each
>  wheel had have an hardwired inside.
>
>  I thought of simulating this by creating an rotot-object for each
>  wheel. rotor.encode(<char>) would encode the letter, which was "feed
>  into" the certain wheel.
>
>  By putting three (or four) rotor-objects in serial this would
>  simulate the encoding phase of all wheels currently "put into" the
>  Enigma.
>
>  The rotating algorithm is a liitle more difficult. Each letter feed
>  into the first wheel will rotate this wheel by one step. At certain
>  positions of the rotation of the first wheel, the second wheel was
>  rotated by one step. And so on.
>
>  To abstract this from the user choosen configuration of the Enigma I
>  want to do something a little similiar to C's function pointer call.
>
>  Is there a way to put different instances of the same class into an
>  array, then stepping through the array and call a certain method for
>  each of the objects?
>
>  Something like:
>
>    objarray=Array.new
>    objarray[idx]=Rotor.new(config)
>    encchar=objarray[idx].method(param)
>  ?
>
>  How do I have to tell this to Ruby ?

Like this?

encoded = objarray.inject(letter) {|param, rotor| rotor.encode param}

I assume, all Rotors are connected, i.e. the first one receives the original
char and the second the result of the first and so forth.  Otherwise you can
use #each or #map.

Regards

    robert