Re: New aggregates with Ada 2022.

["Randy Brukardt" <randy@rrsoftware.com>]

"Jeffrey R.Carter" <spam.jrcarter.not@spam.acm.org.not> wrote in message 
news:t9hi0d$1ebn4$1@dont-email.me...
...
> Perhaps I could have been clearer. I mean that it doesn't make sense to 
> concatenate, sort, slice, or slide an array used as a map. For example, if 
> we represent a map Character => Natural as
>
> type Char_Count_Map is array (Character) of Natural;
> Map : Char_Count_Map;
>
> and want a map with the domain restricted to the ASCII letters, both 
> capital and small,
>
> Map ('A' .. 'Z') & Map ('a' ..'z')
>
> doesn't do what we want.
>
> You are talking about the abstraction of a map in general, and the 
> operations you describe are different from the array operations I was 
> talking about.

Exactly. And this is a general problem with arrays (and with built-in types 
in general): the operations often have no relationship to what it really 
needed. And even when they do, it is more of a happy accident than something 
meaningful. It's way better to not have those confusing operations around in 
the first place.

                 Randy.