From 5cfa67d6a17088c49c74be7b8ca337290f42b7d9 Mon Sep 17 00:00:00 2001
From: "Timur A. Fatkhullin" <timur@sao.ru>
Date: Tue, 17 Feb 2026 15:00:45 +0300
Subject: [PATCH] ...

---
 include/mcc/mcc_movement_controls.h | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/include/mcc/mcc_movement_controls.h b/include/mcc/mcc_movement_controls.h
index 4bc3593..2594a1d 100644
--- a/include/mcc/mcc_movement_controls.h
+++ b/include/mcc/mcc_movement_controls.h
@@ -296,16 +296,20 @@ public:
     template <mcc_hardware_c HARDWARE_T,
               mcc_telemetry_c TELEMETRY_T,
               mcc_pzone_container_c PZONE_CONT_T,
-              mcc_mount_status_c STATUS_T,
-              std::invocable<STATUS_T const&> CallbackFuncT = decltype([](STATUS_T const&) {}),
+              traits::mcc_callable_c CallbackFuncT,
               mcc_logger_c LOGGER_T = MccNullLogger>
-    MccSimpleMovementControls(
-        HARDWARE_T* hardware,
-        TELEMETRY_T* telemetry,
-        PZONE_CONT_T* pzone_cont,
-        CallbackFuncT&& mode_switch_callback = [](STATUS_T const&) {},
-        LOGGER_T* logger = &details::NullLogger)
+    MccSimpleMovementControls(HARDWARE_T* hardware,
+                              TELEMETRY_T* telemetry,
+                              PZONE_CONT_T* pzone_cont,
+                              CallbackFuncT&& mode_switch_callback,
+                              LOGGER_T* logger = &details::NullLogger)
     {
+        static_assert(traits::mcc_func_traits<CallbackFuncT>::arity == 1 &&
+                          mcc_mount_status_c<std::decay_t<traits::mcc_func_arg1_t<CallbackFuncT>>>,
+                      "INVALID 'CallbackFuncT' CALLABLE SIGNATURE!");
+
+        using STATUS_T = std::decay_t<traits::mcc_func_arg1_t<CallbackFuncT>>;
+
         auto send_to_hardware = [hardware, logger](typename HARDWARE_T::hardware_state_t const& hw_state) -> error_t {
             if constexpr (std::derived_from<decltype(hw_state.XY), MccCoordPair<MccAngleX, MccAngleY>>) {
                 logger->logDebug(std::format("Send to hardware: X = {} degs, Y = {} degs", hw_state.XY.x().degrees(),