[cffi-devel] Could use a little help writing a defmacro for a defcfun and defun combo

[Joeish W]

here is the defcfun and deffun combo

;; void cvSplit(const CvArr* src, CvArr* dst0, CvArr* dst1, CvArr* dst2, CvArr* dst3) 
;; Note: I had to use "CV-MERGE" instead of "MERGE" for the Common Lisp name of CV-MERGE so I named this  
;; function CV-SPLIT so they would match. 
(cffi:defcfun ("cvSplit" %split) :void 
  (src cv-arr) 
  (dest-0 cv-arr) 
  (dest-1 cv-arr) 
  (dest-2 cv-arr) 
  (dest-3 cv-arr)) 
 
(defun cv-split (src dest-0 &optional (dest-1 (cffi:null-pointer)) (dest-2 (cffi:null-pointer)) (dest-3 (cffi:null-pointer))) 
  "Divides a multi-channel array into several single-channel arrays." 
  (%split src dest-0 dest-1 dest-2 dest-3)) 


it works as expected ...no errors at all

my attempt at a macro(new to macros) below works in one piece of code when the defun it is in is evaluated at the repl then ran at the repl


;; #define cvCvtPixToPlane cvSplit 
(defmacro cvt-pix-to-plane (src dest-0 &optional (dest-1 (cffi:null-pointer))  
                (dest-2 (cffi:null-pointer)) (dest-3 (cffi:null-pointer))) 
  "Macro for CV-SPLIT" 
         `(cv-split ,src ,dest-0 ,dest-1 ,dest-2 ,dest-3))

but in the same code when used the exact same way    inside emacs (using slime/sbcl on ubuntu saucy)  when it is placed inside a newly opened file (.lisp) or even my well used test.lisp file  and ran with slime-compile-and-load-file i get



  error: 
    Objects of type SB-SYS:SYSTEM-AREA-POINTER can't be dumped into fasl files.
    --> CL-OPENCV::CV-SPLIT 
    ==>
      #.(SB-SYS:INT-SAP #X00000000)

can you help me figure out the issue and write macros with null-pointers correctly
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