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SRFI-4 predicates, length accessors only accept bytevectors (not arrays)

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* module/srfi/srfi-4.scm (define-bytevector-type): For the predicates
  and length accessors, only accept bytevectors.  Since arrays don't
  work for u32vector-ref et al, they shouldn't pass u32vector?.
This commit is contained in:
Andy Wingo 2014-02-07 17:53:01 +01:00
parent 9b5da400dd
commit a675a2e81b
1 changed files with 3 additions and 6 deletions
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9
module/srfi/srfi-4.scm
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@ -1,7 +1,7 @@
;;; srfi-4.scm --- Homogeneous Numeric Vector Datatypes
;; Copyright (C) 2001, 2002, 2004, 2006, 2009, 2010,
;; 2012 Free Software Foundation, Inc.
;; 2012, 2014 Free Software Foundation, Inc.
;;
;; This library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public
@ -75,14 +75,11 @@
(define-macro (define-bytevector-type tag infix size)
`(begin
(define (,(symbol-append tag 'vector?) obj)
(and (uniform-vector? obj)
(eq? (uniform-vector-element-type obj) ',tag)))
(and (bytevector? obj) (eq? (array-type obj) ',tag)))
(define (,(symbol-append 'make- tag 'vector) len . fill)
(apply make-srfi-4-vector ',tag len fill))
(define (,(symbol-append tag 'vector-length) v)
(let ((len (* (uniform-vector-length v)
(uniform-vector-element-size v)
(/ ,size))))
(let ((len (/ (bytevector-length v) ,size)))
(if (integer? len)
len
(error "fractional length" v ',tag ,size))))