add: complementedMaskOp

Author: IgorErin

src/GraphBLAS-sharp.Backend/Common/StandardOperations.fs

@@ -135,3 +135,9 @@ module StandardOperations =
             match left, right with
             | _, Some _ -> left
             | _ -> None @>
+
+    let complementedMaskOp<'a, 'b when 'a: struct and 'b: struct> =
+        <@ fun (left: 'a option) (right: 'b option) ->
+            match left, right with
+            | _, None -> left
+            | _ -> None @>