Add the Kernel#singleton_class? predicate method

This method is a convenient way to know whether a given object is a singleton class or not. This feature has been added in Ruby 2.1 (see https://bugs.ruby-lang.org/issues/7609 for further information).
rubinius · Jul 30, 2014 · 2e71722 · 2e71722
1 parent d159898
commit 2e71722
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/kernel/bootstrap/kernel.rb b/kernel/bootstrap/kernel.rb
@@ -18,6 +18,10 @@ def singleton_class
     Rubinius::Type.object_singleton_class self
   end
 
+  def singleton_class?
+    !!Rubinius::Type.singleton_class_object(self)
+  end
+
   def extend(*mods)
     Rubinius::Type.object_singleton_class(self).include(*mods)
     self