Re: Bug in Ada - Latin 1 is not a subset of UTF-8

["G.B." <bauhaus@futureapps.invalid>]

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