* lib/mathn.rb ({Fixnum,Bignum,Float}#**): may produce complex

	  value.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19603 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Sep 28 09:39:48 2008  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* lib/mathn.rb ({Fixnum,Bignum,Float}#**): may produce complex
+	  value.
+
 Sun Sep 28 09:05:53 2008  James Edward Gray II  <jeg2@ruby-lang.org>
 
 	* lib/csv/csv.rb:  Worked around some minor encoding changes in Ruby

lib/mathn.rb

@@ -61,6 +61,16 @@ class Fixnum
   remove_method :/
   alias / quo
 
+  alias power! **
+
+  def ** (other)
+    if self < 0 && other.round != other
+      Complex(self, 0.0) ** other
+    else
+      power!(other)
+    end
+  end
+
   def_canon *(instance_methods - Object.methods - [:canon])
 
 end
@@ -69,6 +79,16 @@ class Bignum
   remove_method :/
   alias / quo
 
+  alias power! **
+
+  def ** (other)
+    if self < 0 && other.round != other
+      Complex(self, 0.0) ** other
+    else
+      power!(other)
+    end
+  end
+
   def_canon *(instance_methods - Object.methods - [:canon])
 
 end
@@ -261,4 +281,14 @@ class Float
 
   def_canon *(instance_methods - Object.methods - [:canon])
 
+  alias power! **
+
+  def ** (other)
+    if self < 0 && other.round != other
+      Complex(self, 0.0) ** other
+    else
+      power!(other)
+    end
+  end
+
 end