23 lines
907 B
OCaml
23 lines
907 B
OCaml
type 'a variadic =
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| Z : unit variadic
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| U : 'a variadic -> (unit -> 'a) variadic
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| S : 'a variadic -> (string -> 'a) variadic
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| I : 'a variadic -> (int -> 'a) variadic
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| F : 'a variadic -> (float -> 'a) variadic
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(* Printing of a general type, takes pretty printer as argument *)
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| G : 'a variadic -> (('t -> unit) -> 't -> 'a) variadic
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| L : 'a variadic -> (('t -> unit) -> 't list -> 'a) variadic
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let rec print : type a. a variadic -> a = function
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| Z -> ()
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| U v -> fun () -> Format.printf "()\n"; print v
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| S v -> fun x -> Format.printf "%s\n" x; print v
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| I v -> fun x -> Format.printf "%d\n" x; print v
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| F v -> fun x -> Format.printf "%f\n" x; print v
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| G v -> fun pp x -> pp x; print v
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| L v -> fun pp x -> List.iter pp x; print v
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let () =
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print (S (I (S Z))) "I am " 5 "Years old";
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print (S (I (S (L (S Z))))) "I have " 3 " siblings aged " (print (I Z)) [1;3;7]
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