From 254d106c92dcabcdeb83a5d0141deca22ffb79de Mon Sep 17 00:00:00 2001
From: Marcos Magueta <maguetamarcos@gmail.com>
Date: Fri, 9 Oct 2026 01:16:35 -0300
Subject: admission protocol for multigroup denial checks

---
 lib/protocols/Admission.ml | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 lib/protocols/Admission.ml

(limited to 'lib/protocols/Admission.ml')

diff --git a/lib/protocols/Admission.ml b/lib/protocols/Admission.ml
new file mode 100644
index 0000000..5a20105
--- /dev/null
+++ b/lib/protocols/Admission.ml
@@ -0,0 +1,21 @@
+module Error = struct
+  open Concepts.Condition
+
+  let not_admitting () =
+    condition "not-admitting" "A handle was expected to carry the admission protocol and did not"
+      empty
+end
+
+type violations = (string * Concepts.Tuple.t list) list
+
+class type implementation = object
+  method check : (violations, Concepts.Condition.condition) result
+end
+
+type Handle.protocol += Admission of implementation
+type t = implementation
+
+let make impl = Admission (impl :> implementation)
+let from handle = Handle.into handle (function Admission impl -> Some impl | _ -> None)
+let require handle = from handle |> Option.to_result ~none:(Error.not_admitting ())
+let check i = Handle.invoke i (fun o -> o#check)
-- 
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