Format.Args(3)                   OCaml library                  Format.Args(3)

NAME
       Format.Args - The Args module defines a heterogeneous list type, which
       can be used as the argument of printf-like functions.

Module
       Module   Format.Args

Documentation
       Module Args
        : sig end


       The Args module defines a heterogeneous list type, which can be used as
       the argument of printf -like functions.

       It is not required to open this module when using the functions that
       accept an Args.t . Thanks to type-based disambiguation, the type is
       inferred automatically, so the list syntax [x; y; z] can be used
       directly for heterogeneous lists.

       An example:
           (* without opening Args *)
           Format.lprintf "%s %d %.02f@." [ "ocaml"; 42; 3.14 ]

           (* or with explicit construction *)
           let lst = let open Format.Args in "ocaml" :: [ 42; 3.14 ] @ [ 'c' ] in
           Format.lprintf "%s %d %.02f %c@." lst



       Since 5.5





       type ('a, 'r) t =
        | [] : ('r0, 'r0) t
        | (::) : 'a0 * ('b, 'r1) t -> ('a0 -> 'b, 'r1) t





       val apply : 'a -> ('a, 'r) t -> 'r




       val (@) : ('a, 'r1) t -> ('r1, 'r2) t -> ('a, 'r2) t




OCamldoc                          2026-06-22                    Format.Args(3)