1 files changed, 20 insertions, 0 deletions
diff --git a/lib/protocols/Program.ml b/lib/protocols/Program.ml
new file mode 100644
index 0000000..49e6e2d
--- /dev/null
+++ b/lib/protocols/Program.ml
@@ -0,0 +1,20 @@
+module type PROGRAM = sig
+  type t
+end
+
+module Make (P : PROGRAM) = struct
+  class type implementation = object
+    method invoke :
+      program:P.t ->
+      Context.t ->
+      (Handle.t, Concepts.Condition.condition) result
+  end
+
+  type Handle.protocol += Program of implementation
+
+  type t = implementation
+
+  let make impl = Program (impl :> implementation)
+  let from handle = Handle.into handle (function Program impl -> Some impl | _ -> None)
+  let invoke i ~program ctx = Handle.invoke i (fun o -> o#invoke ~program ctx)
+end