Re: Returning data from Ada to C

[Igor Khavkine <igor.kh@gmail.com>]

Thanks for the quick reply.

On 2005-05-04, Jeffrey Carter <spam@spam.com> wrote:
> igor.kh@gmail.com wrote:
>>   /* BTW, is it OK to use Ada allocated memory after `adafinal()'? */
>
> No.

Ok, that's good to know. Also, will I be able to free Ada allocated
memory with the standard C library `free()'? For example, what do I do if
I want to free the storage pointed to by `solvec' below?

>>   sols : C_Double_Array; -- This is probably wrong, but `sols' will be
>>                          -- a C_Double_Array of some size.
>
> This won't compile. C_Double_Array is an unconstrained array type. 
> Objects must be constrained. You probably need
>
> Sols : aliased C_Double_Array (<your constraint here);
>
>> -- Now I want to return `rcnt' and `sols'
>>   rcnt := rc;                -- This is the easy part.
>>   solvec := ???              -- What goes here?
>
> Solvec := Sols'Unchecked_Access;

Great! Now, what type will `Solvec' have? I presume that GNAT will bark at
me if I use the wrong type.

Thanks.

Igor