knu	2009-05-08 02:35:55 +0900 (Fri, 08 May 2009)

  New Revision: 23365

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=23365

  Log:
    * lib/set.rb (SortedSet#add): Do not require each newly added
      element to be Comparable but to respond to <=>. [ruby-dev:38371]

  Modified files:
    branches/ruby_1_8/ChangeLog
    branches/ruby_1_8/lib/set.rb

Index: ruby_1_8/ChangeLog
===================================================================
--- ruby_1_8/ChangeLog	(revision 23364)
+++ ruby_1_8/ChangeLog	(revision 23365)
@@ -1,3 +1,8 @@
+Fri May  8 02:34:25 2009  Akinori MUSHA  <knu@i...>
+
+	* lib/set.rb (SortedSet#add): Do not require each newly added
+	  element to be Comparable but to respond to <=>. [ruby-dev:38371]
+
 Thu May  7 13:58:52 2009  Nobuyoshi Nakada  <nobu@r...>
 
 	* range.c (range_eql): fixed rdoc.
Index: ruby_1_8/lib/set.rb
===================================================================
--- ruby_1_8/lib/set.rb	(revision 23364)
+++ ruby_1_8/lib/set.rb	(revision 23365)
@@ -446,8 +446,8 @@
 # yielded in sorted order (according to the return values of their
 # #<=> methods) when iterating over them.
 # 
-# All elements that are added to a SortedSet must include the
-# Comparable module.
+# All elements that are added to a SortedSet must respond to the <=>
+# method for comparison.
 # 
 # Also, all elements must be <em>mutually comparable</em>: <tt>el1 <=>
 # el2</tt> must not return <tt>nil</tt> for any elements <tt>el1</tt>
@@ -496,7 +496,7 @@
 	  end
 	  
 	  def add(o)
-	    o.is_a?(Comparable) or raise ArgumentError, "value must be comparable"
+	    o.respond_to?(:<=>) or raise ArgumentError, "value must repond to <=>"
 	    super
 	  end
 	  alias << add
@@ -519,7 +519,7 @@
 	  end
 
 	  def add(o)
-	    o.is_a?(Comparable) or raise ArgumentError, "value must be comparable"
+	    o.respond_to?(:<=>) or raise ArgumentError, "value must respond to <=>"
 	    @keys = nil
 	    super
 	  end

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