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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Ada2012 : Expression functions and extended return statements
Date: Wed, 01 Feb 2012 00:20:02 +0100
Organization: Ada @ Home
Message-ID: <op.v8y1ror0ule2fv@douda-yannick>
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Date: 2012-02-01T00:20:02+01:00
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Le Fri, 06 Jan 2012 09:45:26 +0100, Martin <martin@thedowies.com> a =C3=A9=
crit:

> Am I correct in thinking these 2 parts of the language can't be
> 'mixed'?...
>
> There doesn't seem to be anything that allows anything like, e.g.
>
> package Foo is
>    type T (<>) is tagged private;
>    function Create return T is
>       (Result : T do Result.I :=3D 1);
> private
>    type T is tagged record
>       I : Integer;
>    end record;
> end Foo;

Private stuff in the public part is funny, don't you think ?

> Also, on the topic of extended return statements...
>
> What's the rational for having to explicitly repeat the return type?
> Seems rather redundant to my eyes. I wouldn't have minded:

At least because Ada does not have Type Inference. You have to declare t=
he  =

returned entity, just like you would do with a classic return=E2=80=91by=
=E2=80=91copy (*).  =

You have to build something in=E2=80=91place, so have to declare what yo=
u build,  =

even if it's not tagged and class=E2=80=91wide.

Sorry, can't see better words to explain.

(*) Example:

    function F return String
    is
       Result : String;
    begin
       Result :=3D "....";
       P (Result); -- in/out Result
       -- Etc.
       return Result;
    end F;


-- =

=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