type t
The type t
is the type of a first level module you want to load. This is
typically the type of your expected config file, as a top level ocaml module.
The field t_repr
is the concrete OCaml syntax for this module type.
The field univ_constr
is used to constr and match_ values of type t, embedded
in a value of type Univ.t.
The field univ_constr_repr
is the concrete OCaml syntax for the field
univ_constr
.
Example :
{module M : A.S}
defined in the library "mylib.cmxa".
module My_config_loader = Ocaml_plugin.Dynloader.Make (
struct
type t = (module A.S)
let t_repr = "Mylib.A.S"
let univ_constr = A.univ_constr
let univ_constr_repr = "Mylib.A.univ_constr"
end)
t_repr
and univ_constr_repr
should be complete paths, as it would be used by an
ocaml file to link with the shared cmi files, in particular be aware that
if you have some 'open' statements in your file, you might have different t and
t_repr, which is a bad practice.
If the module type A.M_intf
is defined in a package, you would need to add it in
the t_repr, as it is part of the complete path of the module type ("Mylib" in the
example).
val univ_constr : t Univ_constr.t
This implementation is type safe. Some properties should be verified so that the library would work properly:
-the type t
and its representation 't_repr
' should match,
-the plugin implementation doesn't override the module type sig
represented by the string t_repr
:
-the plugin implementation doesn't override the univ_constr scope name
represented by the string univ_constr_repr
-the value univ_constr
and its representation univ_constr_repr
should match.