diff options
Diffstat (limited to 'src/Data/Array/Nested/Ranked/Shape.hs')
| -rw-r--r-- | src/Data/Array/Nested/Ranked/Shape.hs | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/src/Data/Array/Nested/Ranked/Shape.hs b/src/Data/Array/Nested/Ranked/Shape.hs index a1fa247..200fac5 100644 --- a/src/Data/Array/Nested/Ranked/Shape.hs +++ b/src/Data/Array/Nested/Ranked/Shape.hs @@ -331,11 +331,15 @@ shrPermutePrefix :: forall n i. [Int] -> ShR n i -> ShR n i shrPermutePrefix = coerce (listrPermutePrefix @i) shrEnum :: IShR sh -> [IIxR sh] -shrEnum = \sh -> go sh id [] +shrEnum = shrEnum' + +{-# INLINABLE shrEnum' #-} -- ensure this can be specialised at use site +shrEnum' :: Num i => IShR sh -> [IxR sh i] +shrEnum' = \sh -> go sh id [] where - go :: IShR sh -> (IIxR sh -> a) -> [a] -> [a] + go :: Num i => IShR sh -> (IxR sh i -> a) -> [a] -> [a] go ZSR f = (f ZIR :) - go (n :$: sh) f = foldr (.) id [go sh (f . (i :.:)) | i <- [0 .. n - 1]] + go (n :$: sh) f = foldr (.) id [go sh (f . (fromIntegral i :.:)) | i <- [0 .. n - 1]] -- | Untyped: length is checked at runtime. |