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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(** This module centralizes the notions of hooks. Hooks are pointers that are to
be set at runtime exactly once. *)
type 'a t
(** The type of hooks containing ['a]. Hooks can only be set. *)
type 'a value
(** The content part of a hook. *)
val make : ?default:'a -> unit -> ('a value * 'a t)
(** Create a new hook together with a way to retrieve its runtime value. *)
val get : 'a value -> 'a
(** Access the content of a hook. If it was not set yet, try to recover the
default value if there is one.
@raise Assert_failure if undefined. *)
val set : 'a t -> 'a -> unit
(** Register a hook. Assertion failure if already registered. *)
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