marcandre	2009-09-24 10:07:21 +0900 (Thu, 24 Sep 2009)

  New Revision: 25068

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=25068

  Log:
    * lib/mathn.rb (Fixnum#**, Float#**, Bignum#**): Allow fractional power for negative numbers when 'mathn' is required [redmine:783]

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

Index: ruby_1_8/ChangeLog
===================================================================
--- ruby_1_8/ChangeLog	(revision 25067)
+++ ruby_1_8/ChangeLog	(revision 25068)
@@ -1,3 +1,8 @@
+Thu Sep 24 10:06:19 2009  Marc-Andre Lafortune  <ruby-core@m...>
+
+	* lib/mathn.rb (Fixnum#**, Float#**, Bignum#**): Allow fractional
+	  power for negative numbers when 'mathn' is required [redmine:783]
+
 Wed Sep 23 05:36:55 2009  Marc-Andre Lafortune  <ruby-core@m...>
 
 	* eval.c (umethod_bind): Fix bug that disallowed methods from
Index: ruby_1_8/lib/mathn.rb
===================================================================
--- ruby_1_8/lib/mathn.rb	(revision 25067)
+++ ruby_1_8/lib/mathn.rb	(revision 25068)
@@ -108,10 +108,30 @@
 
 class Fixnum
   alias / quo
+
+  alias power! ** unless method_defined? :power!
+
+  def ** (other)
+    if self < 0 && other.round != other
+      Complex.new(self, 0.0) ** other
+    else
+      power!(other)
+    end
+  end
 end
 
 class Bignum
   alias / quo
+
+  alias power! ** unless method_defined? :power!
+
+  def ** (other)
+    if self < 0 && other.round != other
+      Complex.new(self, 0.0) ** other
+    else
+      power!(other)
+    end
+  end
 end
 
 class Rational
@@ -306,3 +326,15 @@
   Unify = true
 end
 
+class Float
+  alias power! **
+
+  def ** (other)
+    if self < 0 && other.round != other
+      Complex.new(self, 0.0) ** other
+    else
+      power!(other)
+    end
+  end
+
+end

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