Merge 5d80c8c into 4ccd27e

leonardt · Jun 7, 2019 · 4a5ecab · 4a5ecab
2 parents 4ccd27e + 5d80c8c
commit 4a5ecab
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/hwtypes/bit_vector_abc.py b/hwtypes/bit_vector_abc.py
@@ -111,6 +111,13 @@ def size(cls) -> int:
     def is_sized(cls) -> bool:
         return cls.size is not None
 
+    def __len__(cls):
+        if cls.is_sized:
+            return cls.size
+        else:
+            raise AttributeError('unsized type has no len')
+
+
 class AbstractBit(metaclass=ABCMeta):
     @staticmethod
     def get_family() -> TypeFamily: