Where to define common functions in Ocaml?

Question

I have some very basic and simple functions shared by several .ml files: for instance, warn, error... I would like to know, instead of repeating their definition in each .ml file, how to define them in a common place, and just call them when necessary? Is it necessarily a module?

Thank you very much!

Victor Nicollet · Accepted Answer · 2011-06-25 14:50:13Z

5

Every file in OCaml defines a module. For instance, you could place your common definitions in:

(* common.ml *)
let error msg = ...
let warn  msg = ...

And then use it from other files as such:

... Common.error "Naughty event!" ...

Or as such:

open Common

... error "Naughty event!" ...

answered Jun 25, 2011 at 14:50

Victor Nicollet

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2 Comments

SoftTimur Over a year ago

Thank you very much... Another question is if this .ml file needs to be compiled to be opened/used in other files, which types of file are actually required: .ml, .mli, .cmi, .cmx, .o?

Victor Nicollet Over a year ago

You need .cmi and either .cmx or .cmo depending on whether you're using ocamlopt or ocamlc (respectively).

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