Define Set#to_set so that aSet.to_set returns self.

* lib/set.rb (Set#to_set): Define Set#to_set so that aSet.to_set
  returns self. [Fixes GH-359]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42051 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/set.rb b/lib/set.rb
index a9aa7e7936..47fcc3efc7 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -148,6 +148,16 @@ class Set
     @hash.keys
   end
 
+  # Returns self if no arguments are given.  Otherwise, converts the
+  # set to another with klass.new(self, *args, &block).
+  #
+  # In subclasses, returns klass.new(self, *args, &block) unless
+  # overridden.
+  def to_set(klass = Set, *args, &block)
+    return self if instance_of?(Set) && klass == Set && block.nil? && args.empty?
+    klass.new(self, *args, &block)
+  end
+
   def flatten_merge(set, seen = Set.new) # :nodoc:
     set.each { |e|
       if e.is_a?(Set)