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(*i $Id$ i*)
(*i*)
open Names
(*i*)
(* [Libobject] declares persistent objects, given with three methods:
a caching function specifying how to add the object in the current
scope of theory modules;
a loading function, specifying what to do when the object is loaded
from the disk;
an opening function, specifying what to do when the module containing
the object is opened;
a specification function, to extract its specification when writing
the specification of a module to the disk (.vi) *)
type 'a object_declaration = {
cache_function : section_path * 'a -> unit;
load_function : section_path * 'a -> unit;
open_function : section_path * 'a -> unit;
export_function : 'a -> 'a option }
(*s Given an object name and a declaration, the function [declare_object]
will hand back two functions, the "injection" and "projection"
functions for dynamically typed library-objects. *)
type obj
val declare_object :
(string * 'a object_declaration) -> ('a -> obj) * (obj -> 'a)
val object_tag : obj -> string
val cache_object : section_path * obj -> unit
val load_object : section_path * obj -> unit
val open_object : section_path * obj -> unit
val export_object : obj -> obj option
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