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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: tagged primitive operation and freezing
Date: Tue, 16 Nov 2010 00:53:03 -0800 (PST)
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troll wrote on comp.lang.ada:
>> But only if it is tagged. untagged type, even though frozen, DOES
>> compile.

My initial reaction to this was: of course, because, if type A is
untagged,

type Flight_T is new A;

freezes Flight_T immediately since its representation is known,
therefore

procedure C is new Blah (Object_T => Flight_T);

is not primitive because not dynamically dispatching.

After re-reading 13.14, I see it does not discuss non-tagged types or
types derived from non-tagged types, so I'm not so sure about the
first part anymore.  And, per 3.2.3(6), C seems to be primitive after
all (primitive subprograms are not necessarily dynamically
dispatching).

While I intuitively agree with Adam's explanation, I can't find the
chapter and verse in the ARM that backs it; it seems like a gray area
to me.

--
Ludovic Brenta.