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Diffstat (limited to 'src/Inky/Data/List.idr')
| -rw-r--r-- | src/Inky/Data/List.idr | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/Inky/Data/List.idr b/src/Inky/Data/List.idr new file mode 100644 index 0000000..24cb9c0 --- /dev/null +++ b/src/Inky/Data/List.idr @@ -0,0 +1,13 @@ +module Inky.Data.List + +public export +data LengthOf : List a -> Type where + Z : LengthOf [] + S : LengthOf xs -> LengthOf (x :: xs) + +%name LengthOf len + +public export +lengthOf : (xs : List a) -> LengthOf xs +lengthOf [] = Z +lengthOf (x :: xs) = S (lengthOf xs) |