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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Bug in Ada - Latin 1 is not a subset of UTF-8
Date: Fri, 21 Oct 2016 18:43:49 +0200
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Xref: news.eternal-september.org comp.lang.ada:32156
Date: 2016-10-21T18:43:49+02:00
List-Id: <comp.lang.ada>

On 2016-10-21 18:13, Lucretia wrote:
> On Friday, 21 October 2016 13:28:52 UTC+1, G.B.  wrote:
>
>>      Test_Bom : constant My_Utf_8_String := Bom & "ABC";
>>      Test_US : constant My_Utf_8_String := "ABC";
>>      Test_GR : constant My_Utf_8_String := "ΑΒΓ";
>>      Test_RU : constant My_Utf_8_String := "АБГ";
>>      Test_Xx : constant My_Utf_8_String :=
>>        ('A', Character'Val (16#E4#), 'E');
>
> Also, the most inefficient string ever:
>
> Appended : My_UTF_8_String := "App";
>
> Appended := Some_Other_String & 'e';  --  Call's Is_Well_Formed for each assignment! Sloooooooooooooow
> Appended := Some_Other_String & 'n';
> Appended := Some_Other_String & 'd';

For an UTF-8 string proper no checks would be ever required when a 
character is appanded.

The above is a sorry mess of representation colliding with the 
semantics, octets with characters. 'e' is a Latin-1 character appended 
as an octet while Unicode character meant.

Wrong design gets always punished this way or another.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de