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Date: 4 May 93 13:45:49 GMT
From: cis.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!howland.
reston.ans.net!europa.eng.gtefsd.com!fs7.ece.cmu.edu!news.sei.cmu.edu!firth@ucb
vax.Berkeley.EDU  (Robert Firth)
Subject: Re: Passing procedures as parameters to procedures.
Message-ID: <1993May4.094549.13420@sei.cmu.edu>
List-Id: <comp.lang.ada>

In article <1993May3.190746.1043@ee.ubc.ca> luisl@ee.ubc.ca (luis linares-rojas
) writes:

>Before commiting myself to any long term commitment with the Ada language,
>I've been revising its capabilities.  There is something that I have not
>found so far: how to pass a procedure (or a function) as a parameter to anothe
r
>procedure (or function).  Or, in the same spirit, how to create an array of
>procedures.  The question is: is there a way of doing this in Ada, and (if so)
>how?  I'd appreciate any help.

Alas, Ada has no good way to do this, and I doubt you'd want to maintain
code that used any of several bad ways.  I assume for your first problem
you're trying to replicate something like the Algol-60

	real procedure Integrate ( real procedure F; real lwb, upb );

and put it in a library package somewhere.  You can't do it.

The second problem is typified by a finite state machine: you have a
two-dimensional array indexed on [state, input], and each component is
a procedure Action that returns the new state.  And you probably want
to change the actions on the fly.  Nope, you can't do that either.

Sorry; as I see it, either use another language or hold your breath 
until Ada93.