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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Ada requires too much typing!
Date: Wed, 09 Jun 2010 23:09:52 +0200
Organization: Ada At Home
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Date: 2010-06-09T23:09:52+02:00
List-Id: <comp.lang.ada>

Le Wed, 09 Jun 2010 21:10:06 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
>> So this should not be a compilation unit and this should be expressed=
 in
>> the language. Do you think about something at the level of types ?
>
> Depends on the intentions. If you render it as a type, then it must be=
 a
> class-wide one. This is the reason why I believe that generics are
> superfluous and could be gradually replaced by classes.

What would become formal parameters, like type parameters ? Overloading =
 =

functions returning type derived from that of the ancestor one ? OK. So,=
  =

this will require an original bas type in the root definition which coul=
d  =

be wide enough to reach actual capabilities of generics. An =E2=80=9CANY=
=E2=80=9D type  =

(like in QBasic) ? An abstract base type ? OK. So, now, we will need to =
be  =

able to declare abstract base type, that is, abstract discrete types, et=
c.  =

Is that what's in your mind ?


>> I guess
>> this should be able to express a kind of structure, so: Canvas ?  =

>> Patterns ?
>
> [...] Normally this stuff comes with dynamic
> typing, types inference, things I don't like to see in a language like=
  =

> Ada.

No, this is not required (while this oftenly the case, yes)


> Depends on the meaning of these.

Just means =E2=80=9Cpattern=E2=80=9D ;) well... pie dish, cake tin, waff=
le iron, and so on  =

(btw, none of these latter requires dynamic typing)


-- =

There is even better than a pragma Assert: a SPARK --# check.
--# check C and WhoKnowWhat and YouKnowWho;
--# assert Ada;
--  i.e. forget about previous premises which leads to conclusion
--  and start with new conclusion as premise.