20 lines
619 B
Scheme
20 lines
619 B
Scheme
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; Copyright (c) 1993-1999 by Richard Kelsey and Jonathan Rees. See file COPYING.
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; Code-vectors implemented as vectors.
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(define *code-vector-marker* (list '*code-vector-marker*))
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(define (make-code-vector len init)
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(let ((t (make-vector (+ len 1) init)))
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(vector-set! t 0 *code-vector-marker*)
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t))
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(define (code-vector? obj)
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(and (vector? obj)
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(> (vector-length obj) 0)
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(eq? (vector-ref obj 0) *code-vector-marker*)))
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(define (code-vector-length t) (- (vector-length t) 1))
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(define (code-vector-ref t i) (vector-ref t (+ i 1)))
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(define (code-vector-set! t i x) (vector-set! t (+ i 1) x))
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