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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Discriminants of tagged types
Date: Sun, 31 Oct 2010 00:01:42 +0200
Organization: Ada @ Home
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Date: 2010-10-31T00:01:42+02:00
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Le Sat, 30 Oct 2010 23:21:39 +0200, Vinzent Hoefler  =

<nntp-2010-10@t-domaingrabbing.de> a =C3=A9crit:
> Given an opaque type, how can you tell the difference? The set of
> visible operations is the same.
>
> Anything else is an implementation detail that does not concern the
> user of the type. IMO polymorphism and copy semantics are distinct
> concepts.
And that's true from an Ada's point view indeed : you can have tagged  =

types derived from the root Controlled type, and this can all be hidden =
 =

 from the public view. So at least Ada allows tagged types to be either =
 =

Reference Semantic or Value Semantic the same way, and this can be part =
of  =

either the public contract or of the implementation only.

-- =

Si les chats miaulent et font autant de vocalises bizarres, c=E2=80=99es=
t pas pour  =

les chiens.