diff options
Diffstat (limited to 'src/Data/Array/Nested/Ranked/Shape.hs')
| -rw-r--r-- | src/Data/Array/Nested/Ranked/Shape.hs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/Data/Array/Nested/Ranked/Shape.hs b/src/Data/Array/Nested/Ranked/Shape.hs index 488b4d8..a1fa247 100644 --- a/src/Data/Array/Nested/Ranked/Shape.hs +++ b/src/Data/Array/Nested/Ranked/Shape.hs @@ -330,6 +330,13 @@ shrZipWith f (ShR l1) (ShR l2) = ShR $ listrZipWith f l1 l2 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 [] + where + go :: IShR sh -> (IIxR sh -> a) -> [a] -> [a] + go ZSR f = (f ZIR :) + go (n :$: sh) f = foldr (.) id [go sh (f . (i :.:)) | i <- [0 .. n - 1]] + -- | Untyped: length is checked at runtime. instance KnownNat n => IsList (ListR n i) where |