[cells-devel] Problem with defmd and dependency ...

[Frank Goenninger]

Correct problem case:

I defined the foreign-ptr cell as lazy (as :until-asked) for a  
reason ... ->

0>  7612 calculating cell ~a appears in call stack: ~a dirty=0/ 
foreign-ptr/gnc-point0] dirty=0/foreign-ptr/gnc-point0]
(dirty=0/foreign-ptr/gnc-point0])

... landing in a (break) ...

Ok. So I am basically looking for an idiom on how to avoid the  
circularity. I sense there is a simple solution but ...

Oh my. It's been a long day ;-)

Frank


Am 29.08.2007 um 21:35 schrieb Frank Goenninger:

> * PGP Signed: 08/29/07 at 21:35:14
>
> Hi Kenny (and all on the list):
>
> I have a simple defmd:
>
> (defmd gnc-point ()
> 	(x (c-in 0))
> 	(y (c-in 0))
> 	(z (c-in 0))
> 	(foreign-ptr (c_? (let ((ptr (or (^foreign-ptr) (fgn-alloc 'glInt  
> 3 :gnc-point))))
> 							   (when ptr
> 								   (setf (eltgli ptr 0) (^x))
> 							     (setf (eltgli ptr 1) (^y))
> 							     (setf (eltgli ptr 2) (^z)))
> 								 ptr))))
>
>
> This is a model for a point ( x | y | z ) and a foreign object  
> pointer. The pointer shall be set to a an FFI memory pointer (via  
> CFFI) when the instance is created. Also, the elements of the  
> memory array (which is 3 glInt, this being three OpenGL Integers)  
> shall be updated when any of the coordinates x y z is changed...
>
> I get  x, y, and z updated but the foreign-ptr remains NIL ... What  
> am I doing wrong ???
>
> Thx!
>
> Frank
>
>
> * Frank Goenninger<frgo at mac.com>
> * 0xED320F02:0x05AE0907
> _______________________________________________
> cells-devel site list
> cells-devel at common-lisp.net
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>
>
> * PGP Signed: 08/29/07 at 21:35:14
> * text/plain body
> * Frank Goenninger<frgo at mac.com>
> * 0xED320F02:0x05AE0907

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