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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: Unchecked_Deallocation with tagged types
Date: Thu, 22 Apr 2021 01:55:56 -0700
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> writes:

> On 4/20/21 5:57 PM, Stephen Leake wrote:
>> "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> writes:
>> 
>>> package Lists is
>>>     type Handle is tagged limited private;
>>>
>>>     procedure Clear (List : in out Handle);
>>>
>>> and then use
>>>
>>>     List : Lists.Handle;
>>>
>>>     List.Clear;
>> Just to provide an alternative, I like:
>>   package Lists is
>>      type List is tagged limited private;
>>      procedure Clear (List : in out Lists.List);
>>   and then use
>>      List : Lists.List;
>>      List.Clear;
>
> Lists.List is a bit repetitive. Are you sure you don't want
> Lists.Listy_List_Listing?

Yes. It's a list. Just a list, nothing more, nothing less.

>
>
>> that saves you having to think up a bogus name for the 'list' type.
>
> I think of private types as allowing you to manipulate their
> abstraction without know how it's implemented, much as the handle on a
> suitcase allows you to manipulate its contents without knowing what's
> in there. So Handle seems an appropriate name.

In this case, the point of the package is precisely to provide a list,
implemented by an actual list. It's not a "bag" or some other "generic
container". That would be a at higher level, where the type would be
"bag" or "generic_container".

-- 
-- Stephe