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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Question[s] about aliased extended return.
Date: Fri, 09 Nov 2012 04:40:01 +0100
Organization: Ada @ Home
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Date: 2012-11-09T04:40:01+01:00
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Le Fri, 09 Nov 2012 01:43:15 +0100, Randy Brukardt <randy@rrsoftware.com=
>  =

a =C3=A9crit:

> "Shark8" <onewingedshark@gmail.com> wrote in message
> news:9bbd99bd-f953-434d-b3c8-6e8a6d5c7dfd@googlegroups.com...
>> The syntax for the extended return given in the RM
>> [ http://www.ada-auth.org/standards/12rm/html/RM-6-5.html ] allows fo=
r  =

>> the
>> usage
>> of the keyword ALIASED, with the restriction of "if the keyword alias=
ed  =

>> is
>> present
>>  in an extended_return_object_declaration, the type of the extended  =

>> return
>> object
>>  shall be immutably limited."
>>
>> The 2012 rationale entry regarding the extended return
>> [ http://www.ada-auth.org/standards/12rat/html/Rat12-4-6.html ] says =
of
>> immutably limited objects:
>> * it is an explicitly limited record type,
>> * it is a task type, protected type or synchronized interface,
>> * it is a non-formal limited private type that is tagged or has an  =

>> access
>> discriminant with a default expression, [or]
>> * it is derived from an immutably limited type.
>>
>> (1) Doesn't this reduce the usefulness of the extended return?
>
> No. Allowing "aliased" at all was a bug in Ada 2005; we preserved it o=
nly
> for compatibility (some GNAT customers used it a lot).

Why not list it in the Obsolescent Features section?

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity