generate dispatch method only once

eendebakpt · eendebakpt · commit 52773350687c · 2023-07-05T11:28:06.000+02:00
diff --git a/Lib/functools.py b/Lib/functools.py
@@ -933,6 +933,7 @@ def __init__(self, func):
 
         self.dispatcher = singledispatch(func)
         self.func = func
+        self.attrname = None
 
     def register(self, cls, method=None):
         """generic_method.register(cls, func) -> func
@@ -949,12 +950,19 @@ def _method(*args, **kwargs):
         _method.__isabstractmethod__ = self.__isabstractmethod__
         _method.register = self.register
         update_wrapper(_method, self.func)
+        if obj is not None:
+            # we set the method directly to the instance
+            obj.__dict__[self.attrname] = _method
         return _method
 
     @property
     def __isabstractmethod__(self):
         return getattr(self.func, '__isabstractmethod__', False)
 
+    def __set_name__(self, owner, name):
+         if self.attrname is None:
+             self.attrname = name
+
 
 ################################################################################
 ### cached_property() - computed once per instance, cached as attribute
