akr	2008-01-27 04:49:37 +0900 (Sun, 27 Jan 2008)

  New Revision: 15258

  Modified files:
    trunk/test/ruby/test_sprintf_comb.rb

  Log:
    make combination recursionless.


  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test_sprintf_comb.rb?r1=15258&r2=15257&diff_format=u

Index: test/ruby/test_sprintf_comb.rb
===================================================================
--- test/ruby/test_sprintf_comb.rb	(revision 15257)
+++ test/ruby/test_sprintf_comb.rb	(revision 15258)
@@ -107,15 +107,18 @@
   VS.reverse!
 
   def combination(*args)
-    if args.empty?
-      yield []
-    else
-      arg = args.shift
-      arg.each {|v|
-        combination(*args) {|vs|
-          yield [v, *vs]
-        }
+    args = args.map {|a| a.to_a }
+    i = 0
+    while true
+      n = i
+      as = []
+      args.reverse_each {|a|
+        n, m = n.divmod(a.length)
+        as.unshift a[m]
       }
+      break if 0 < n
+      yield as
+      i += 1
     end
   end
 

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