#s8(-128 127 ...)instead of
#vu8(255 127 ...). So now, I can write like this.
#<(srfi :4)> ;; enable the reader macro (import (rnrs) (srfi :4)) (define s8 #s8(-128 127)) ;; #s8(...) is reader macro (display s8) (newline) ;; prints #s8(-128 127) (s8vector-set! s8 0 1) ;; unspecified (s8vector-ref s8 0) ;; returns 1 (s8vector-set! s8 0 -128) ;; unspecified (s8vector->list s8) ;; (-128 127) (list->s8vector '(1 2));; #s8(1 2) (bytevector? s8) ;; #fThe homogeneous vectors are not bytevector defined in R6RS. So
bytevector?returns #f. Maybe I will write a conversion procedure someday.
The reason why I wanted this is really simple. When I want to read a byte array dumped from Java, it is convenient to be able to write it. (Well, if I dump it, I can convert it to unsigned. But if I peek it from debugger, byte in Java is signed. I really hate this). I actually didn't have any intention to make it a library but when I wrote the reader macro, I thought I will write this again if I don't make the library.
Why is it #s8 instead of #vs8?
Implementation restriction... #vs8 was too long for dispatch macro and if I did it, I also need to rewrite existed bytevector reader.