update to the ref implementation as of 02-July-2013:

* more predictable dispatch thanks to C3-based linearization for ABC support

* improved tests and docstrings

1 files changed, 12 insertions, 0 deletions

diff --git a/singledispatch_helpers.py b/singledispatch_helpers.py
index 5c4aa8b..3a71831 100644
--- a/singledispatch_helpers.py
+++ b/singledispatch_helpers.py
@@ -8,6 +8,7 @@ from __future__ import unicode_literals
 
 from abc import ABCMeta
 from collections import MutableMapping, UserDict
+import sys
 try:
     from thread import get_ident
 except ImportError:
@@ -148,3 +149,14 @@ class MappingProxyType(UserDict):
 
 def get_cache_token():
     return ABCMeta._abc_invalidation_counter
+
+
+
+class Support(object):
+    def dummy(self):
+        pass
+
+    def cpython_only(self, func):
+        if 'PyPy' in sys.version:
+            return self.dummy
+        return func