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From: xorque <xorquewasp@googlemail.com>
Newsgroups: comp.lang.ada
Subject: Overriding the "lowest level" stream procedures
Date: Sun, 11 Oct 2009 07:56:34 -0700 (PDT)
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Date: 2009-10-11T07:56:34-07:00
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Hello.

I'd like to ensure that any piece of code in a program that executes:

  T'Output (Stream, S);
  S := T'Input (Stream);

(Where T is String or a type derived from String and S is an object of
any of those types)

... Has to go through my (overridden) Stream procedures. I'm
essentially trying to ensure that all textual data is written in a
strictly defined (not implementation defined) format so that the
program can communicate with other programs not written in
Ada. I also want to make it as hard as possible to, for example,
accidentally miss out a statement such as:

  for X'Output use Some_Output_Procedure;

...and end up using the default stream procedures again.

I think I probably need to define my own Stream type. Is this the
case?