Module Format.ArgsSource

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