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From: "Steve" <nospam_steved94@comcast.net>
Newsgroups: comp.lang.ada
References: <mailman.69.1071063420.31149.comp.lang.ada@ada-france.org>
 <wccekvc2rol.fsf@shell01.TheWorld.com>
Subject: Re: Proposed change to BC iterator parameters
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"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message
news:wccekvc2rol.fsf@shell01.TheWorld.com...
[snip]
>
> I don't understand the point of Param_Type and Param above.  If you want
> to pass extra information to Apply, nest the instantiation in a place
> where it can see that data.

The reason for Param_Type and Param is to avoid using data outside of the
scope of the Apply routine except for the arguments to the Apply machine.
It comes from that old school of thought:
  Avoid global data
  All inputs and outputs of a procedure should appear in their parameter
lists

Following these simple guidelines usually makes code a lot easier to follow.

Steve
(The Duck)

>
> - Bob