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Hi Bernhard,
Either I'm not explaining myself well enough or I'm missing something? You
don't *need* to know how C handles it - you just need to use C to transform
it into a form that you *can* access from BlackBox.
1. Suppose you had a function in C e.g.
void SomeFunction(gsl_complex z)
would you be then able to access that yourself using BlackBox?
2. If the answer to (1) is yes, then you could write a function
void ComplexAdd(gsl_complex a, gsl_complex b, gsl_complex sum);
{
sum = gsl_complex_add (a, b);
}
and then call that from BlackBox couldn't you?
P.S. I'm not happy that you've tricked me into writing some C code .... ;-)
--------------------------------------------------
"Information on the Oberon day 2009 will be announced here."
http://www.oberon.ethz.ch/news/index
I posted a message asking about Oberon Day 2009 on the ETH newsgroup. I also
sent a message to Ulrike Glavitsch if she knew when it was going to be but I
haven't had any replies yet. Ulrike had sent an invitation to the Embedded
Computing Conference 2009 in Winterthur that included three
Oberon/A2-related talks. We're past the June 12th date when the previous
Oberon Day was announced so I'm beginning to suspect that it is not going to
happen.
Regards,
Chris
Chris Burrows
CFB Software
http://www.cfbsoftware.com
>-----Original Message-----
>From: Treutwein Bernhard
>[mailto:Bernhard.Treutwein{([at]})nowhere.xy>Sent: Friday, 3 July 2009 5:12 PM
>To: info{([at]})nowhere.xy>Subject: RE: [BLACKBOX] structured return types
>
>Hi Chris,
>
>> It has to work otherwise you wouldn't be able to access structured
>> results in a C program either.
>
>but the calling C function knows that there are (e.g. for
>Complex as defined here:
>http://www.gnu.org/software/gsl/manual/html_node/Representation
>-of-complex-nu
>mbers.html)
>two doubles (i.e. 16 byte) left on the stack, so the caller
>can clean up the stack.
>
>For our case (interface module to CP for a library implemented
>in C, stdcall calling convention, see:
>http://en.wikipedia.org/wiki/X86_calling_conventions#stdcall)
>I have no idea, what is given back and where ...).
>
>[...]
>>
>> The more I think about it the more I uderstand the reluctance to
>> implement structured results ;-)
>
>hmm, that was the reason for saying: We need a long(er)
>testing phase and I would like to see two compiler ...
>
>>
>> How are you by the way?
>
>quite fine, if there would be more time for ideas & plans,
>which are pushed on the stack / laying on the heap, I'd feel
>even finer ...
>
>> I was hoping I might be able to catch up with you at another Oberon
>> Day this year but time is running out ...
>>
>>
>
>is there one?
>
>cheers
>--
> Bernhard
>
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Received on Fri Jul 03 2009 - 10:07:22 UTC