From 5f404a62910f87391bbc4c16b0a7fcb6bdf87864 Mon Sep 17 00:00:00 2001
From: "Timur A. Fatkhullin" <timur@sao.ru>
Date: Mon, 27 Jan 2025 17:58:39 +0300
Subject: [PATCH] ...

---
 cxx/control_proto.h |  4 ++++
 cxx/mount.h         | 56 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 cxx/mount.h

diff --git a/cxx/control_proto.h b/cxx/control_proto.h
index 0f436c5..58eaba6 100644
--- a/cxx/control_proto.h
+++ b/cxx/control_proto.h
@@ -49,6 +49,10 @@ static constexpr std::string_view CONTROL_PROTO_STR_TRACK_XVEL = "trackXVEL";
 static constexpr std::string_view CONTROL_PROTO_STR_TRACK_YVEL = "trackYVEL";
 static constexpr std::string_view CONTROL_PROTO_STR_STOP = "stop";
 
+// site coordinates
+static constexpr std::string_view CONTROL_PROTO_STR_SITE_LON = "siteLON";
+static constexpr std::string_view CONTROL_PROTO_STR_SITE_LAT = "siteLAT";
+
 static constexpr std::array CONTROL_PROTO_VALID_COMMAND = {CONTROL_PROTO_STR_SLEW_AZALT, CONTROL_PROTO_STR_SLEW_RADEC};
 
 class ControlProtoParser
diff --git a/cxx/mount.h b/cxx/mount.h
new file mode 100644
index 0000000..2d6de35
--- /dev/null
+++ b/cxx/mount.h
@@ -0,0 +1,56 @@
+#pragma once
+
+/*  MOUNT CONTROL COMPONENTS LIBRARY  */
+
+#include <concepts>
+#include <cstdint>
+#include <functional>
+
+namespace mcc
+{
+
+enum class MccMountType : uint8_t { GERMAN_TYPE, FORK_TYPE, CROSSAXIS_TYPE, ALTAZ_TYPE };
+
+
+// mount state type concept
+template <typename T>
+concept mcc_mount_state_c = requires(T t, const T t_const) {
+    typename T::state_id_t;
+    { t.ident() } -> std::same_as<typename T::state_id_t>;
+
+    typename T::context_t;
+    { t.enter(std::declval<const typename T::context_t&>()) } -> std::same_as<void>;
+    { t.exit(std::declval<const typename T::context_t&>()) } -> std::same_as<void>;
+};
+
+
+
+// implements a Finite State Machine Pattern
+template <MccMountType MOUNT_TYPE>
+class MccMount
+{
+public:
+    static constexpr MccMountType mountType = MOUNT_TYPE;
+
+
+    MccMount()
+    {
+        _exitCurrentState = []() {};  // do nothing
+    }
+
+    virtual ~MccMount() {}
+
+    template <mcc_mount_state_c StateT>
+    void setMountState(StateT& state)
+    {
+        _exitCurrentState();  // exit from current state
+        _exitCurrentState = [&state, this]() { state.exit(this); };
+
+        state.enter(this);
+    }
+
+protected:
+    std::function<void()> _exitCurrentState;
+};
+
+}  // namespace mcc