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NNTP-Posting-Date: Fri, 11 Jun 2010 07:25:58 -0500
From: Brian Drummond <brian_drummond@btconnect.com>
Newsgroups: comp.lang.ada
Subject: Re: What is the best way to convert Integer to Short_Short_Integer?
Date: Fri, 11 Jun 2010 13:31:55 +0100
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Date: 2010-06-11T13:31:55+01:00
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On Fri, 11 Jun 2010 00:07:16 -0700, "Jeffrey R. Carter"
<spam.jrcarter.not@spam.acm.org> wrote:

>Adrian Hoe wrote:
>> 
>> I have a number which is in the range of -128..127 and is read as
>> Integer (32-bit). 
>>... we can use either method: type conversion
>> as Jeff suggested or use Unchecked_Conversion.
>
>Which byte of the 32-bit integer will Unchecked_Conversion return?

Good question. On which machine? :-)

>> Which is the preferred method? Short_Short_Integer (I) or
>> Unchecked_Conversion?
>
>A type conversion is preferred.

And it has no downside. If you need to distinguish between errors here and a
more general "constraint error", it is easy to wrap the conversion in a function
which locally handles "constraint error", and does something appropriate (e.g.
saturates, or raises "range error").

- Brian