* lib/ostruct.rb: Also accept {Open}Struct as argument to new

[ruby-core:47476] [Feature #7007]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37375 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -122,6 +122,8 @@ with all sufficient information, see the ChangeLog file.
     * OpenStruct#eql?
     * OpenStruct#hash
     * OpenStruct#to_h converts the struct to a hash.
+  * extended method:
+    * OpenStruct.new also accepts an OpenStruct / Struct.
 
 * pathname
   * extended method:

lib/ostruct.rb

@@ -74,7 +74,8 @@ class OpenStruct
   # Creates a new OpenStruct object.  By default, the resulting OpenStruct
   # object will have no attributes.
   #
-  # The optional +hash+, if given, will generate attributes and values.
+  # The optional +hash+, if given, will generate attributes and values
+  # (can be a Hash, an OpenStruct or a Struct).
   # For example:
   #
   #   require 'ostruct'
@@ -86,8 +87,9 @@ class OpenStruct
   def initialize(hash=nil)
     @table = {}
     if hash
-      for k,v in hash
-        @table[k.to_sym] = v
+      hash.each_pair do |k, v|
+        k = k.to_sym
+        @table[k] = v
         new_ostruct_member(k)
       end
     end

test/ostruct/test_ostruct.rb

@@ -2,6 +2,13 @@ require 'test/unit'
 require 'ostruct'
 
 class TC_OpenStruct < Test::Unit::TestCase
+  def test_initialize
+    h = {name: "John Smith", age: 70, pension: 300}
+    assert_equal h, OpenStruct.new(h).to_h
+    assert_equal h, OpenStruct.new(OpenStruct.new(h)).to_h
+    assert_equal h, OpenStruct.new(Struct.new(*h.keys).new(*h.values)).to_h
+  end
+
   def test_equality
     o1 = OpenStruct.new
     o2 = OpenStruct.new