Hi, I have made a patch for ocaml 3.12.1 which allow to have a generic printing function. The patch is available here:
http://www.dimino.org/ocaml-3.12.1-generic-print.patch Here is how to use it: external show : 'a -> string = "%show" let () = print_endline (show ([1; 2; 3], Some "foo")) this will print: ([1; 2; 3], Some "foo") It is also possible to define custom printers, for example: module StringMap : sig include Map.S with type key = string val string_of_t : ('a -> string) -> 'a t -> string end = struct include Map.Make(String) let string_of_t (type a) string_of_a (m : a t) = show (bindings m) end let () = print_endline (show (StringMap.singleton "x" 1)) will print: [("x", 1)] Of course it is limited to what the compiler knows, for example the following function will always returns "[<poly>; <poly>]": let f x = show [x; x] But i think it is already very useful for debugging. The git repo is here: http://www.dimino.org/gitweb/?p=ocaml-3.12.1-print.git;a=summary Cheers, -- Jérémie -- Caml-list mailing list. Subscription management and archives: https://sympa-roc.inria.fr/wws/info/caml-list Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
