[gambit-list] FFI Converting std::vector to scheme-vector (best practice)

Mikael mikael.rcv at gmail.com
Tue Aug 20 08:01:27 EDT 2013


Waait. I didn't check but I'm not so sure it's supposed to work like that -
I wonder why you had access to ___result_voidstar there at all.

Please allocate such a test structure *locally on the stack* within your
struct-test procedure, and then set ___result to it. I.e., by value and not
by pointer passing. Then paste here again.




2013/8/19 Chris Mueller <ruunsmail at gmail.com>

> On 19.08.2013 12:16, Mikael wrote:
> >
> > So in your past test with a pointered type, you did see the proper
> > behavior.  And here comes what applies to the current test:
> >
> >     In the case of the |struct|, |union| and |type| types, the default
> >     function reclaims the copy on the C heap referenced by the internal
> >     pointer (when using a C++ compiler this is done using ‘delete
> >     (type*)internal-pointer’, which calls the destructor of type if it
> >     is a class) and returns ‘___FIX(___NO_ERR)’.
> >
> >
> > Can you paste your full test code here?
> >
>
> Of course :)
>
> ;; struct definition
> (c-declare "struct test { int a; int b; };")
>
> (c-define-type struct-test (struct "test"))
>
> (define struct-test
>    (c-lambda () struct-test "___result_voidstar = new test;"))
>
> ;; test code
> (load "test")
>
> (define (alloc-struct n)
>    (let loop ((i 0))
>      (if (< i n)
>        (let ((a (struct-test)))
>          (loop (+ i 1))
>          (write "FIN")))))
>
> (alloc-struct 100000000000)
>
>
>
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