gis: Merged revisions 5491-5539 via svnmerge from

     http://code.djangoproject.com/svn/django/trunk


git-svn-id: http://code.djangoproject.com/svn/django/branches/gis@5540 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 15 insertions, 0 deletions

diff --git a/django/utils/functional.py b/django/utils/functional.py
index 0c31c1f375..a57546ad2d 100644
--- a/django/utils/functional.py
+++ b/django/utils/functional.py
@@ -3,6 +3,21 @@ def curry(_curried_func, *args, **kwargs):
         return _curried_func(*(args+moreargs), **dict(kwargs, **morekwargs))
     return _curried
 
+def memoize(func, cache):
+    """
+    Wrap a function so that results for any argument tuple are stored in
+    'cache'. Note that the args to the function must be usable as dictionary
+    keys.
+    """
+    def wrapper(*args):
+        if args in cache:
+            return cache[args]
+
+        result = func(*args)
+        cache[args] = result
+        return result
+    return wrapper
+
 class Promise:
     """
     This is just a base class for the proxy class created in