I'd like to displace an (unsigned-byte 8) array to an (unsigned-byte 32)
array.
But that doesn't seem to be supported (see below). Is there any way to
do this?
- Bob
----------------------------------
> (setq aa (make-array 100 :element-type '(unsigned-byte 32)))
> (setq bb (make-array 100 :displaced-to aa :element-type
'(unsigned-byte 8)))
;; It ignores the supplied element-type
> (describe bb)
#(0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...) is a displaced vector of
length 100.
It has no fill pointer.
Its element type is specialized to (UNSIGNED-BYTE 32).
-------------------------------------
;; Mapping in the other direction gets an error:
> (setq cc (make-array 100 :element-type '(unsigned-byte 8)))
#(0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...)
> (setq dd (make-array 10 :displaced-to cc :element-type
'(unsigned-byte 32)))
Error in function MAKE-ARRAY:
One can't displace an array of type (UNSIGNED-BYTE
32) into another of type
(UNSIGNED-BYTE
8).
[Condition of type SIMPLE-ERROR]
