From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: "G.B." <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Bug in Ada - Latin 1 is not a subset of UTF-8
Date: Tue, 18 Oct 2016 01:25:18 +0200
Organization: A noiseless patient Spider
Message-ID: <nu3mkc$agg$1@dont-email.me>
References: <86f0d2fe-d498-4bc4-bb9d-e34629c89bb4@googlegroups.com>
Reply-To: nonlegitur@futureapps.de
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Mon, 17 Oct 2016 23:25:01 -0000 (UTC)
Injection-Info: mx02.eternal-september.org;
 posting-host="33c7532313ceae98ec8560b57cd233ab";
	logging-data="10768"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1/QcrYz5OeO/QhVwkXsftpojJtP6T8wBPs="
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:45.0)
 Gecko/20100101 Thunderbird/45.4.0
In-Reply-To: <86f0d2fe-d498-4bc4-bb9d-e34629c89bb4@googlegroups.com>
Cancel-Lock: sha1:xnYhEo/cefK8FuMx5mowv3j6jnA=
Xref: news.eternal-september.org comp.lang.ada:32100
Date: 2016-10-18T01:25:18+02:00
List-Id: <comp.lang.ada>

On 17.10.16 22:18, Lucretia wrote:
> Hi,
>
> Whilst binding SDL_TTF function, I was going to Overload the TTF_Size* functions, but I couldn't do that because UTF_8_String is a subtype of String; String is Latin 1 and Latin 1 is not a subset of UTF-8, ASCII is.
>
> UTF_String should be implemented as an array like String and then UTF_8_String should be a subtype of UTF_String or a renaming, if that is the intent.
>

According to ISO 10646, UTF stands for UCS Transformation
Format. So, it's a format, suggesting a representation.

On similar grounds, one could define a string subtype for
other types of objects, for example

   subtype Number_String is String;

The components represent the bits of the octets of the numbers
(base 256) in sequence, of whole numbers assumed to be
phone numbers. Each phone number is headed by a plus sign.

So, calling a taxi by telephone in Berlin, Dublin, or Ho Chi Minh
City might be helped by turning the string

   "+^@^A%??+^@^H9^K-+^@^S??^C"

into the respective numbers.

The intent, I guess, of UTF_String and its kin is to facilitate
reading and writing items of UCS.


-- 
"HOTDOGS ARE NOT BOOKMARKS"
Springfield Elementary teaching staff