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Diffstat (limited to 'clib/canary.ml')
| -rw-r--r-- | clib/canary.ml | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/clib/canary.ml b/clib/canary.ml new file mode 100644 index 00000000..b8b79ed7 --- /dev/null +++ b/clib/canary.ml @@ -0,0 +1,28 @@ +(************************************************************************) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *) +(* <O___,, * (see CREDITS file for the list of authors) *) +(* \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 t = Obj.t + +let obj = Obj.new_block Obj.closure_tag 0 + (** This is an empty closure block. In the current implementation, it is + sufficient to allow marshalling but forbid equality. Sadly still allows + hash. *) + (** FIXME : use custom blocks somehow. *) + +module type Obj = sig type t end + +module Make(M : Obj) = +struct + type canary = t + type t = (canary * M.t) + + let prj (_, x) = x + let inj x = (obj, x) +end |