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From: CDCKAB%EMUVM1.BITNET@cunyvm.cuny.edu ( Karl Brendel)
Newsgroups: comp.lang.pascal
Subject: Re: Pointers to procedures
Message-ID: <26523@adm.brl.mil>
Date: 10 Apr 91 18:20:56 GMT
Sender: news@adm.brl.mil
Lines: 32

In article <Ec0TSOS00WCZAYM0Q3@andrew.cmu.edu>, bg11+@andrew.cmu.edu
  (Brian E. Gallew) wrote:

>I don't know much about Procedure Pointers in PASCAL, but I can see
>one way in which this becomes truly elegant.
>
>Define an array of Procedure Pointers.  This, in conjuction with a
>numerical or key-letter input reduces to a mapping function (for
>key-letters) and a single call ProcPtrVar[Choice];

True, but the original question involved accepting a character
_string_ naming the procedure (although e-mail has revealed that
what the poster really _wants_ is a menu pick). Also this solution
doesn't allow for passing parameters to procedures unless they all
take the same sequence of parameters (same quantity, order and
type). (E-mail has also revealed that the poster does want varying
sequences of parameters.)

(Of course, an input character string can be compared to an array of
character strings to determine an index to an array of pointers. I
think this has previously been proposed in this discussion. IMO,
that is only slightly more elegant than IFs, and again does not
allow varying sequences of parameters.)

Cheers--                        --Karl

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