Fixed #3678 -- Implemented SortedDict.copy().

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4688 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 7 insertions, 0 deletions

diff --git a/django/utils/datastructures.py b/django/utils/datastructures.py
index 94ab76c483..e924e4edbc 100644
--- a/django/utils/datastructures.py
+++ b/django/utils/datastructures.py
@@ -92,6 +92,13 @@ class SortedDict(dict):
         "Returns the value of the item at the given zero-based index."
         return self[self.keyOrder[index]]
 
+    def copy(self):
+        "Returns a copy of this object."
+        # This way of initialising the copy means it works for subclasses, too.
+        obj = self.__class__(self)
+        obj.keyOrder = self.keyOrder
+        return obj
+
 class MultiValueDictKeyError(KeyError):
     pass