From 698b3c925d757cd7113f9916db2dbb7e2eabf2f4 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Thu, 10 Sep 2015 23:03:53 +0900
Subject: add Hash#rehash to handle key modification; ref #2945

---
 mrblib/hash.rb | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'mrblib/hash.rb')

diff --git a/mrblib/hash.rb b/mrblib/hash.rb
index cb52c1ffe..48ac96e56 100644
--- a/mrblib/hash.rb
+++ b/mrblib/hash.rb
@@ -319,6 +319,29 @@ class Hash
     h
   end
 
+  ##
+  #  call-seq:
+  #    hsh.rehash -> hsh
+  #
+  #  Rebuilds the hash based on the current hash values for each key. If
+  #  values of key objects have changed since they were inserted, this
+  #  method will reindex <i>hsh</i>.
+  #
+  #     h = {"AAA" => "b"}
+  #     h.keys[0].chop!
+  #     h          #=> {"AA"=>"b"}
+  #     h["AA"]    #=> nil
+  #     h.rehash   #=> {"AA"=>"b"}
+  #     h["AA"]    #=> "b"
+  #
+  def rehash
+    h = {}
+    self.each{|k,v|
+      h[k] = v
+    }
+    self.replace(h)
+  end
+
   def __update(h)
     h.each_key{|k| self[k] = h[k]}
     self
-- 
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