From: Guillermo J. Rozas <edu/mit/csail/zurich/gjr>
Date: Thu, 14 Jun 1990 00:02:47 +0000 (+0000)
Subject: Add sequence-immediate-actions that does not flatten the structure.
X-Git-Tag: 20090517-FFI~11387
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=b451853b41af8aacce964d282745dca69c7c0621;p=mit-scheme.git

Add sequence-immediate-actions that does not flatten the structure.
---

diff --git a/v7/src/runtime/scomb.scm b/v7/src/runtime/scomb.scm
index e51120616..583946cf1 100644
--- a/v7/src/runtime/scomb.scm
+++ b/v7/src/runtime/scomb.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/scomb.scm,v 14.4 1989/10/26 06:47:03 cph Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/scomb.scm,v 14.5 1990/06/14 00:02:47 jinx Exp $
 
 Copyright (c) 1988 Massachusetts Institute of Technology
 
@@ -109,6 +109,17 @@ MIT in each case. |#
 	(else
 	 (list sequence))))
 
+(define (sequence-immediate-actions sequence)
+  (cond ((object-type? (ucode-type sequence-2) sequence)
+	 (list (&pair-car sequence)
+	       (&pair-cdr sequence)))
+	((object-type? (ucode-type sequence-3) sequence)
+	 (list (&triple-first sequence)
+	       (&triple-second sequence)
+	       (&triple-third sequence)))
+	(else
+	 (error "sequence-immediate-actions: not a sequence" sequence))))
+
 (define-integrable (sequence-components sequence receiver)
   (receiver (sequence-actions sequence)))