Re: [Swig-user] conversion wrappers for Lisp code

[Tamas Papp <tkpapp@gm...>]

Hi Surendra,

Then maybe I am doing something wrong:

(cairo_line_to *cr* 0 100)

gives

Type-error in KERNEL::OBJECT-NOT-DOUBLE-FLOAT-ERROR-HANDLER:
   0 is not of type DOUBLE-FLOAT
   [Condition of type TYPE-ERROR]

Restarts:
  0: [ABORT-REQUEST] Abort handling SLIME request.
  1: [ABORT] Return to Top-Level.

Backtrace:
  0: ("LAMBDA (G3550 G3551 G3552 G3553)" #<Alien (FUNCTION (VALUES)
SYSTEM:SYSTEM-AREA-POINTER DOUBLE-FLOAT DOUBLE-FLOAT) at #x58000668>
#.(SYSTEM:INT-SAP #x08087F98) 0 100)
  1: (CAIRO_LINE_TO #.(SYSTEM:INT-SAP #x08087F98) 0 100)
  2: ("DEFSLIMEFUN INTERACTIVE-EVAL")

where cairo_line_to is generated by SWIG as

(cffi:defcfun ("cairo_line_to" cairo_line_to) :void
  (cr :pointer)
  (x :double)
  (y :double))

How can I enable the automatic conversion you mentioned?

Thanks,

Tamas

On 5/13/07, Surendra Singhi <efuzzyone@...> wrote:
>
> Hi,
>
> "Tamas Papp" <tkpapp@...> writes:
>
> > The Lisp (CFFI) interface generated for C functions expects the same
> numeric
> > type as the original function (double-float, etc).  It is possible to
> > automatically generate wrappers for these functions so that they would
> > accept any numeric type and convert the numbers to the desired format?
>
> You will have to write your own wrappers for any conversion beyond what
> lisp
> and cffi does. Lisp should automatically convert, say integer to floats.
>
> Cheers,
> -Surendra
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> Swig-user mailing list
> Swig-user@...
> https://lists.sourceforge.net/lists/listinfo/swig-user
>

Re: [Swig-user] conversion wrappers for Lisp code

[Surendra Singhi <efuzzyone@ne...>]

Hi,

"Tamas Papp" <tkpapp@...> writes:

> The Lisp (CFFI) interface generated for C functions expects the same numeric
> type as the original function (double-float, etc).  It is possible to
> automatically generate wrappers for these functions so that they would
> accept any numeric type and convert the numbers to the desired format?

You will have to write your own wrappers for any conversion beyond what lisp
and cffi does. Lisp should automatically convert, say integer to floats. 

Cheers,
-Surendra