is it possible to effect stack allocation of foreign pointers

[james anderson]

good evening;

> On 2017-09-07, at 16:13, Attila Lendvai <attila at lendvai.name> wrote:
> 
>>  (let ((lhs-quad (cffi:foreign-slot-value lhs '(:struct liblmdb:val) 'liblmdb:mv-data))
>>        (rhs-quad (cffi:foreign-slot-value rhs '(:struct liblmdb:val) 'liblmdb:mv-data)))
>>    (declare (dynamic-extent lhs-quad rhs-quad))
>>    (%compare-quad lhs-quad rhs-quad)))
> 
> try to use (cffi:with-foreign-object (lhs :pointer) …)

the lhs/rhs variables are parameters to the callback.
if i understand your suggestion, you mean the lhs-quad/rhs-quad variables.

this leaves still the question, how to set their value from the respective passed argument structures.

best regards, from berlin,
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james anderson | james at dydra.com | http://dydra.com