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From: "Matthew Heaney" <matthew_heaney@acm.org>
Subject: Re: An alternative to Unchecked Conversion
Date: 1999/12/16
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Date: 1999-12-16T00:00:00+00:00
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In article <3859701a@rsl2.rslnet.net> , "Tom Hargraves" 
<tharg@vtcinet.com> wrote:

> I welcome comments re. the technical merits of address mapping vs.
> unchecked_conversion. For me address mapping worked fine, whereas
> unchecked_conversion did a lot of additional data copying. So that's why I
> didn't use it. What did I loose?

The object declaration

declare
  function To_Unsigned is
    new Unchecked_Conversion (Character, Unsigned_8);

  C_As_Byte : constant Unsigned_8 := To_Unsigned ('A');
begin

should be identical to the declaration

declare
  C : constant Character := 'A';
begin


If the former is more expensive than the latter, then your compiler is
broken.