From 6c8d354b8d9ca2fa62d0e062fa6346673dd15dbf Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Tue, 21 Jun 2005 07:00:28 +0000
Subject: Added Fix/Bignum#multiple_of? which returns true on
 14.multiple_of?(7) and false on 16.multiple_of?(7) #1464 [Thomas Fuchs] Added
 even? and odd? to work with Bignums in addition to Fixnums #1464 [Thomas
 Fuchs]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1462 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 activesupport/lib/active_support/core_ext/fixnum.rb       |  4 ++++
 .../lib/active_support/core_ext/fixnum/even_odd.rb        |  6 +++++-
 activesupport/test/core_ext/fixnum_ext_test.rb            | 15 +++++++++++++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/activesupport/lib/active_support/core_ext/fixnum.rb b/activesupport/lib/active_support/core_ext/fixnum.rb
index fecef1da52..e983d5c0f9 100644
--- a/activesupport/lib/active_support/core_ext/fixnum.rb
+++ b/activesupport/lib/active_support/core_ext/fixnum.rb
@@ -3,3 +3,7 @@ require File.dirname(__FILE__) + '/fixnum/even_odd'
 class Fixnum #:nodoc:
   include ActiveSupport::CoreExtensions::Fixnum::EvenOdd
 end
+
+class Bignum #:nodoc:
+  include ActiveSupport::CoreExtensions::Fixnum::EvenOdd
+end
\ No newline at end of file
diff --git a/activesupport/lib/active_support/core_ext/fixnum/even_odd.rb b/activesupport/lib/active_support/core_ext/fixnum/even_odd.rb
index 1fa6b95846..c0e9da18fa 100644
--- a/activesupport/lib/active_support/core_ext/fixnum/even_odd.rb
+++ b/activesupport/lib/active_support/core_ext/fixnum/even_odd.rb
@@ -7,8 +7,12 @@ module ActiveSupport #:nodoc:
       # * 2.even? # => true
       # * 2.odd? # => false
       module EvenOdd
+        def multiple_of?(number)
+          self % number == 0
+        end
+        
         def even?
-          self % 2 == 0
+          multiple_of? 2
         end
         
         def odd?
diff --git a/activesupport/test/core_ext/fixnum_ext_test.rb b/activesupport/test/core_ext/fixnum_ext_test.rb
index 627c282b8b..7ffc32a9e1 100644
--- a/activesupport/test/core_ext/fixnum_ext_test.rb
+++ b/activesupport/test/core_ext/fixnum_ext_test.rb
@@ -5,10 +5,25 @@ class FixnumExtTest < Test::Unit::TestCase
   def test_even
     assert [ -2, 0, 2, 4 ].all? { |i| i.even? }
     assert ![ -1, 1, 3 ].all? { |i| i.even? }
+    
+    assert 22953686867719691230002707821868552601124472329079.odd?
+    assert !22953686867719691230002707821868552601124472329079.even?
+    assert 22953686867719691230002707821868552601124472329080.even?
+    assert !22953686867719691230002707821868552601124472329080.odd?
   end
 
   def test_odd
     assert ![ -2, 0, 2, 4 ].all? { |i| i.odd? }
     assert [ -1, 1, 3 ].all? { |i| i.odd? }
   end
+  
+  def test_multiple_of
+    assert [ -7, 0, 7, 14 ].all? { |i| i.multiple_of? 7 }
+    assert ![ -7, 0, 7, 14 ].all? { |i| i.multiple_of? 6 }
+    # test with a prime
+    assert !22953686867719691230002707821868552601124472329079.multiple_of?(2)
+    assert !22953686867719691230002707821868552601124472329079.multiple_of?(3)
+    assert !22953686867719691230002707821868552601124472329079.multiple_of?(5)
+    assert !22953686867719691230002707821868552601124472329079.multiple_of?(7)
+  end
 end
-- 
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