bugfix: include user_impl()

1 files changed, 3 insertions, 0 deletions

diff --git a/neb/__init__.py b/neb/__init__.py
index 5602ebe..a6d5193 100644
--- a/neb/__init__.py
+++ b/neb/__init__.py
@@ -184,6 +184,9 @@ class MultiFunction(Callable):
     def describe(self):
         return [i.describe() for i in self.impls.values()]
 
+    def user_impl(self):
+        return len(list(x for x in self.impls.values() if isinstance(x, UserFunction))) != 0
+
     def register(self, impl):
         self.impls[f"{impl.sig}"] = impl