[Chicken-janitors] #382: implement pointer-vectors

[Chicken Trac]

#382: implement pointer-vectors
----------------------------+-----------------------------------------------
 Reporter:  felix           |       Owner:  felix
     Type:  enhancement     |      Status:  new  
 Priority:  minor           |   Milestone:       
Component:  unknown         |     Version:  4.6.x
 Keywords:  pointer-vector  |  
----------------------------+-----------------------------------------------
 `lolevel` unit:

 {{{
 (make-pointer-vector SIZE [INIT [STATIC]])
 (release-pointer-vector PV)
 (pointer-vector? X)
 (pointer-vector PTR ...)
 (pointer-vector-ref PV I)
 (pointer-vector-set! PV I PTR)
 }}}

 ref/set! accept/return `#f` for NULL-pointers.

 Add foreign-type `pointer-vector`, which maps to `void **`.

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Ticket URL: <http://bugs.call-cc.org/ticket/382>
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