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From: Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Practicalities of Ada for app development
Date: Mon, 11 Jun 2012 12:16:14 -0700
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Date: 2012-06-11T12:16:14-07:00
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On 06/11/2012 11:29 AM, Adam Beneschan wrote:
>
> IIRC, some people have proposed adding unsigned integer types to the
> language; they've argued that modular types aren't good enough for some
> purposes.  But the idea was turned down.

Really, there are 2 orthogonal qualities: signed or unsigned representation, and 
overflow checking or not. These lead to 4 kinds of integer types. Ada has direct 
support for 2:

* signed, checked (type T is range Low .. High;)
* unsigned, unchecked (type T is mod High;)

There is also a kind of support for unsigned, checked:

type T is range 0 .. 2 ** N - 1;
for T'Size use N;

One can turn off overflow checking to get signed, unchecked.

-- 
Jeff Carter
"You me on the head hitted."
Never Give a Sucker an Even Break
108

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