From e6751285660863cda41f1ca7dc147238916425bc Mon Sep 17 00:00:00 2001
From: Skip Montanaro <skip@pobox.com>
Date: Thu, 8 Apr 2004 21:14:34 +0000
Subject: [PATCH] Add Ping's enhanced singleton decorator.

---
 pep-0318.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pep-0318.txt b/pep-0318.txt
index c51e39d06..070d16ec7 100644
--- a/pep-0318.txt
+++ b/pep-0318.txt
@@ -270,7 +270,12 @@ some examples of use.
    ::
 
        def singleton(cls):
-           return cls()
+           instances = {}
+           def getinstance():
+               if cls not in instances:
+                   instances[cls] = cls()
+               return instances[cls]
+           return getinstance
 
        class MyClass [singleton]:
            ...