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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2012 and type access to in out functions
Date: Tue, 11 Oct 2011 10:38:33 -0700 (PDT)
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Date: 2011-10-11T10:38:33-07:00
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On Oct 11, 5:10=A0am, Yannick Duch=EAne (Hibou57)
<yannick_duch...@yahoo.fr> wrote:

> > Using GNAT GPL 2011, I try to define a type that is an access to an in
> > out function, and the following example code [1] is illegal for the
> > compiler.
>
> > Is it an Ada 2012 restriction on using in out functions, a GNAT GPL
> > 2011 limitation or a bug ?
>
> > Cheers,
>
> > [1]
> > -- gnatmake -gnat12 in_out_function_access_type.adb
> > procedure In_Out_Function_Access_Type is
>
> > =A0 =A0function Validate (Status : in out Boolean) return String
> > =A0 =A0is
> > =A0 =A0begin
> > =A0 =A0 =A0 Status :=3D True;
> > =A0 =A0 =A0 return "command";
> > =A0 =A0end Validate;
>
> > =A0 =A0type Callback is access function (Status : in out Boolean) retur=
n
> > String;
> > =A0 =A0-- illegal =A0functions can only have "in" parameters.
> > =A0 =A0-- build successfully if the above line is commented
> > begin
> > =A0 =A0null;
> > end In_Out_Function_Access_Type;
>
> Possibly not already implemented in GNAT 2011 so.
>
> Sorry, can't test right now, as I don't have my Ada 2012 compiler (GNAT =
=A0
> too), on hand. I just can tell you in/out parameters for functions are =
=A0
> valid Ada 2012.

Out of curiosity, what exactly were you thinking of
testing?  :) :) :)  And what question would it have answered?

                       -- Adam