diff options
| -rw-r--r-- | src/Data/Array/Mixed.hs | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/Data/Array/Mixed.hs b/src/Data/Array/Mixed.hs index d9eb5f0..9a8ccfd 100644 --- a/src/Data/Array/Mixed.hs +++ b/src/Data/Array/Mixed.hs @@ -252,7 +252,13 @@ index xarr i = let XArray arr' = indexPartial xarr i :: XArray '[] a in S.unScalar arr' -append :: forall sh a. (KnownShapeX sh, Storable a) => XArray sh a -> XArray sh a -> XArray sh a +type family AddMaybe n m where + AddMaybe Nothing _ = Nothing + AddMaybe (Just _) Nothing = Nothing + AddMaybe (Just n) (Just m) = Just (n + m) + +append :: forall n m sh a. (KnownShapeX sh, Storable a) + => XArray (n : sh) a -> XArray (m : sh) a -> XArray (AddMaybe n m : sh) a append (XArray a) (XArray b) | Dict <- lemKnownINatRankSSX (knownShapeX @sh) , Dict <- knownNatFromINat (Proxy @(Rank sh)) |