From ccdc87bd2def2f37f4454abc0f39e5d14ea72066 Mon Sep 17 00:00:00 2001
From: Eric Niebler <eniebler@nvidia.com>
Date: Sat, 20 Jul 2024 09:36:15 -0700
Subject: [PATCH] add `operation_state_t` tag type

---
 include/stdexec/__detail/__operation_states.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/stdexec/__detail/__operation_states.hpp b/include/stdexec/__detail/__operation_states.hpp
index 2c7ecdf80..f118fc862 100644
--- a/include/stdexec/__detail/__operation_states.hpp
+++ b/include/stdexec/__detail/__operation_states.hpp
@@ -24,6 +24,9 @@
 #include <type_traits>
 
 namespace stdexec {
+  // operation state tag type
+  struct operation_state_t { };
+
   /////////////////////////////////////////////////////////////////////////////
   // [execution.op_state]
   namespace __start {