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From: Tarek Ghaleb <invalid@invalid.org>
Newsgroups: comp.lang.ada
Subject: Re: System.Address to Access to function/procedure conversion
Date: Sun, 28 Jul 2013 22:54:27 +0000 (UTC)
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Date: 2013-07-28T22:54:27+00:00
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On 2013-07-28, Shark8 <onewingedshark@gmail.com> wrote:
>> I agree completely. Using C convention is the way to do it. But is it
>> *possible* to call a function using its address? (even if not a such a
>> great idea)

> Yes. It's actually absurdly easy. Here's a sample of how to do it in
> Ada 2012, the same will work in earliet versions of Ada using
> Pargmas... all the way back to 83, IIUC.

>     ACTUAL_TEST:
>     declare
>
> 	Procedure K with Convention => C;
> 	Procedure K is
> 	begin
> 	    Ada.Text_IO.Put_Line( "K was called" );
> 	end K;
> 	
> 	Procedure Execute( Addr : System.Address ) is
> 	    Procedure Stub with Import, Convention => C, Address => Addr;
> 	Begin
> 	    Stub;
> 	End Execute;
> 	
>     begin
> 	Execute( K'Address );
>     end ACTUAL_TEST; 

Great! I didn't know about the Address Aspect. I don't think it exists
in pragma form, though. At least I couldn't find it in the RM; but
thanks, that answers my question.

Tarek.

-- 
Aim for the moon. If you miss, you may hit a star. -- W. Clement Stone

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