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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Variadic-function/OCaml/variadic-function-3.ocaml Normal file
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type 'a variadic =
| Z : unit variadic
| U : 'a variadic -> (unit -> 'a) variadic
| S : 'a variadic -> (string -> 'a) variadic
| I : 'a variadic -> (int -> 'a) variadic
| F : 'a variadic -> (float -> 'a) variadic
(* Printing of a general type, takes pretty printer as argument *)
| G : 'a variadic -> (('t -> unit) -> 't -> 'a) variadic
| L : 'a variadic -> (('t -> unit) -> 't list -> 'a) variadic
let rec print : type a. a variadic -> a = function
| Z -> ()
| U v -> fun () -> Format.printf "()\n"; print v
| S v -> fun x -> Format.printf "%s\n" x; print v
| I v -> fun x -> Format.printf "%d\n" x; print v
| F v -> fun x -> Format.printf "%f\n" x; print v
| G v -> fun pp x -> pp x; print v
| L v -> fun pp x -> List.iter pp x; print v
let () =
print (S (I (S Z))) "I am " 5 "Years old";
print (S (I (S (L (S Z))))) "I have " 3 " siblings aged " (print (I Z)) [1;3;7]