Module `Hook`

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.

raises Assert_failure: if undefined.

val set : 'a t -> 'a -> unit: Register a hook. Assertion failure if already registered.