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From: Andrew Lynch <lynch@cci.de>
Subject: Ada83: Attribute value for a float?
Date: 1997/07/28
Message-ID: <33DC6CA2.1670@cci.de>#1/1
X-Deja-AN: 259724635
Distribution: world
Organization: Competence Center Informatik GmbH
Reply-To: lynch@cci.de
Newsgroups: comp.lang.ada
Date: 1997-07-28T00:00:00+00:00
List-Id: <comp.lang.ada>


Hi,

we've just started "recycling" some old Ada83 code, which compiles
fine using GNAT, both with and without the -gnat83 switch.
When I took the code home and tried to compile it on my Linux box
with my universities Ada83 compiler it complained about the following:

    ...
    some_float := FLOAT'value(some_string);
    ...


Looking in the LRMs I found the following:

Ada83 LRM Annex A:
P'VALUE   For a prefix P that denotes a discrete type or subtype...

Ada95 LRM Annex K:
S'Value   For every scalar subtype S...

IIRC a float is scalar, but not discrete which I would take to mean
that Float'Value is not legal Ada83.

The code was aparently developed using the Telesoft Ada compiler around
1992/1993 and also compiled on a number of other Ada83 compilers
(so say the guys who've been here longer than I have...)
So is this valid Ada83, or maybe an extension that was supported by
many compiler vendors (and then made it into Ada95)?

A definite answer/reference would be appreciated!

Andrew.