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123456789101112131415161718192021222324252627282930(************************************************************************)(* * The Rocq Prover / The Rocq Development Team *)(* v * Copyright INRIA, CNRS and contributors *)(* <O___,, * (see version control and CREDITS file for authors & dates) *)(* \VV/ **************************************************************)(* // * This file is distributed under the terms of the *)(* * GNU Lesser General Public License Version 2.1 *)(* * (see LICENSE file for the text of the license) *)(************************************************************************)
type 'a content =| Unset| Set of 'a
type 'a t = 'a content ref
type 'a value = 'a t
let get (hook : 'a value) = match !hook with| Unset -> assert false| Set data -> data
let set (hook : 'a t) data = match !hook with| Unset -> hook := Set data| Set _ -> assert false
let make () = let ans = ref Unset in (ans, ans)