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Newsgroups: comp.lang.ada
Subject: Re: How to check a Float for NaN
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From: Stephen Leake <Stephe.Leake@nasa.gov>
Date: Fri, 09 May 2008 03:24:21 -0400
Message-ID: <u4p983pp6.fsf@nasa.gov>
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Date: 2008-05-09T03:24:21-04:00
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"Randy Brukardt" <randy@rrsoftware.com> writes:

> "Adam Beneschan" <adam@irvine.com> wrote in message 
> news:95c1de75-7aa0-4f00-bbc4-6f503a3c7aef@b9g2000prh.googlegroups.com...
> ...
>>   type Ieee_Short_Real is
>>      record
>>         Mantissa_Sign : Mantissa_Sign_Type;
>>         Exponent      : Exponent_Type;
>>         Mantissa      : Mantissa_Type;
>>      end record;
>>
>> (I've omitted the rep clause because I think the one above might work
>> only for big-endian and not little-endian machines or vice versa, and
>> I don't feel like figuring it out because I have a cold and my head
>> hurts enough already.)
>
> Sorry about the cold, but if you omit the rep. clause, all of these 
> components are likely to take full bytes and that won't work at all.
>
> IF you had given size clauses on all of the modular types AND a pragma Pack 
> on the record, it MIGHT have worked. But given that you need a particular 
> representation, omitting the rep. clause is irrational. (That said, getting 
> it right on both big-endian and little-endian machines is enough to make my 
> head explode. But it's rarely necessary, and certainly isn't in the OP's 
> case.)

Ada 2005 supports endian-independent rep clauses; LRM 13.5.3 9/2.

However, GNAT doesn't support them for anything bigger than 1 byte.

I don't know about other compilers.

-- 
-- Stephe