From: "David Botton" <dbotton@hotmail.com>
Subject: Re: win32ada design question/problem
Date: 1998/11/19
Date: 1998-11-19T00:00:00+00:00 [thread overview]
Message-ID: <732kpc$15sk$1@news.gate.net> (raw)
In-Reply-To: 7323td$426$1@nnrp1.dejanews.com
I believe that GNAT complies and the example would pass a pointer to the
String appropriate for C.
Would it be necessary to say
pragma Convention (c, String_Access)?
I know that it would not be necessary in GNAT, but would it be needed for
portability?
DB
> Mats.Weber@elca-matrix.ch wrote:
>> Tom Moran wrote:
>>
>> On the other hand,
>>
>> type String_Access is access String;
>>
>> function C_Function (X : in String_Access);
>>
>> C_Function(S'Unchecked_Access);
>>
>> will sometimes not work because some compilers (and that includes GNAT)
>> use fat pointers for access to unconstrained arrays (I am not saying
>> that this is bad).
>
>No, not if they follow the implementation advice.
>
>LRM B.3(63 & 67) An implementation should support the following interface
>correspondences between Ada and C. ... o An Ada in parameter of an
>access-to-object type with designated type T is passed as a t* argument to
a
>C function, where t is the C type corresponding to the Ada type T.
>
>
>--
>T.E.D.
>
next prev parent reply other threads:[~1998-11-19 0:00 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-11-13 0:00 win32ada design question/problem Mats Weber
1998-11-13 0:00 ` Tom Moran
1998-11-16 0:00 ` Mats Weber
1998-11-18 0:00 ` Tom Moran
1998-11-18 0:00 ` dennison
1998-11-19 0:00 ` Mats Weber
1998-11-19 0:00 ` dennison
1998-11-19 0:00 ` David Botton [this message]
1998-11-19 0:00 ` David Botton
1998-11-19 0:00 ` Mats Weber
1998-11-23 0:00 ` Marin David Condic
1998-11-19 0:00 ` Mats Weber
1998-11-27 0:00 ` Roga Danar
1998-11-13 0:00 ` dennison
1998-11-16 0:00 ` Stephen Leake
1998-11-16 0:00 ` Tucker Taft
1998-11-17 0:00 ` dennison
1998-11-17 0:00 ` Mats Weber
1998-11-17 0:00 ` dennison
1998-11-17 0:00 ` Mats Weber
1998-11-17 0:00 ` Tucker Taft
1998-11-18 0:00 ` Tom Moran
1998-11-18 0:00 ` dennison
-- strict thread matches above, loose matches on Subject: below --
1998-11-19 0:00 tmoran
1998-11-19 0:00 ` dennison
1998-11-19 0:00 ` Tom Moran
1998-11-20 0:00 ` dennison
1998-11-20 0:00 ` Tom Moran
1998-11-23 0:00 ` Marin David Condic
1998-11-23 0:00 ` Mats Weber
1998-11-24 0:00 ` dennison
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