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From: dewar@schonberg.cs.nyu.edu (Robert Dewar)
Subject: Re: Rules for Representation of Subtypes
Date: 1996/09/27
Message-ID: <dewar.843880244@schonberg>#1/1
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references: <mheaney-ya023080002209961353500001@news.ni.net>
 <01bba947$d8990620$188371a5@dhoossr.iquest.com> <dewar.843570543@schonberg>
 <DyC5xn.K3L@thomsoft.com> <mheaney-ya023180002609962246250001@news.ni.net>
organization: New York University
newsgroups: comp.lang.ada
Date: 1996-09-27T00:00:00+00:00
List-Id: <comp.lang.ada>


Matthew says

""If the size of a type of a first named subtype T has been specified by a
length clause, the T'Size yields the specified size, AND THE SIZE OF EVERY
SUBTYPE OF T IS ALSO THIS VALUE [my emphasis].""

This is an Ada 83 AI. For whatever  reasons, the Ada 95 RM does not follow
this AI, or permit compilers to follow it. RM 95 requires that subtypes
have a different size from the first subtype if the range is static and
a smaller type is possible.