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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Discriminated records are not the most efficient, but ...
Date: Mon, 23 Aug 2010 03:52:14 +0200
Organization: Ada At Home
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Date: 2010-08-23T03:52:14+02:00
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Le Sun, 22 Aug 2010 22:47:24 +0200, Florian Weimer <fw@deneb.enyo.de> a =
 =

=C3=A9crit:
> But doesn't that mean that the package you want to pass has to be an
> instance of a generic package?  I haven't seen that programming style
> much.
Now I've just seen about Structures and Functors (you seems to know ML, =
do  =

you ?), and we could say =E2=80=9CAda's functors=E2=80=9D can only get f=
unctors as  =

parameter, not structures.

This should be kept in mind while mapping from ML to Ada, while honestly=
,  =

this would be a matter only when there are children packages. But as suc=
h  =

a package would typically encapsulate an ADT, this will most of time not=
  =

be a matter, as most commonly such a package will not have children  =

(because this is not needed if well designed, except if you want to exte=
nd  =

with access to some private parts and that is really required.. otherwis=
e,  =

siblings rooted somewhere may be a better option).

And any way, as Dmitry would tell you (and I agree): =E2=80=9Cgenerics h=
ierarchies  =

are not always so fun=E2=80=9D.