module Sub:sig
..end
typet =
string * int * int
val make : string -> int -> len:int -> t
val full : string -> t
val copy : t -> string
val underlying : t -> string
val sub : t -> int -> int -> t
val get : t -> int -> char
get s i
gets the i
-th element, or failsInvalid_argument
if the index is not within 0... length -1
include CCString.S