From 4244f76041b4d901a7fe2140ffaa25edfb8f3dd4 Mon Sep 17 00:00:00 2001
From: "Timur A. Fatkhullin" <amirych@gmail.com>
Date: Tue, 20 May 2025 23:32:25 +0300
Subject: [PATCH] ...

---
 cxx/mount.h       | 84 +++++++++++++++++++++++++++++++++++++++++++----
 cxx/mount_state.h |  6 ++++
 2 files changed, 83 insertions(+), 7 deletions(-)

diff --git a/cxx/mount.h b/cxx/mount.h
index 9e3b68f..5e0b30b 100644
--- a/cxx/mount.h
+++ b/cxx/mount.h
@@ -252,26 +252,96 @@ public:
 
     class MccMountState
     {
-    public:
-        MccMountState(MccMount& mount) : _mount(mount) {}
+        static constexpr std::string_view emptyIdentString{"EMPTY-STRING-MOUNT-STATE-IDENTIFICATOR"};
 
-        virtual ~MccMountState() = default;
+    public:
+        MccMountState(MccMount& mount, traits::mcc_input_char_range auto const& ident)
+            : _mount(mount), _ident({ident.begin(), ident.end()})
+        {
+            _mount.logTrace("Create MccMountState instance: {}", (void*)this);
+
+            if (!_ident.size()) {
+                _mount.logWarn("An empty input mount state identificator! Use of default value!");
+                _ident = emptyIdentString;
+            }
+        }
+
+
+        MccMountState(MccMount& mount, const char* ident) : MccMountState(mount, std::string_view(ident)) {}
+
+        MccMountState(MccMountState&&) = default;  // movable
+        MccMountState& operator=(MccMountState&&) = default;
+
+        MccMountState(const MccMountState&) = delete;  // non-copyable
+        MccMountState& operator=(const MccMountState&) = delete;
+
+
+        virtual ~MccMountState()
+        {
+            _mount.logTrace("Delete MccMountState instance: {}", (void)this);
+        };
+
+
+        std::string_view ident() const
+        {
+            return _ident;
+        }
 
         void enter(this std::derived_from<MccMountState> auto&& self)
         {
-            std::forward<decltype(self)>(self).enter();
+            std::forward<decltype(self)>(self).enterImpl();
         }
 
-        void exit(std::derived_from<MccMountState> auto next_state)
-            requires std::movable<decltype(next_state)>
+        void stop(this std::derived_from<MccMountState> auto&& self)
         {
-            _mount.setMountState(std::move(next_state));
+            std::forward<decltype(self)>(self).stopImpl();
+        }
+
+        void exit(this std::derived_from<MccMountState> auto&& self, std::derived_from<MccMountState> auto next_state)
+        {
+            std::forward<decltype(self)>(self).exitImpl(std::move(next_state));
         }
 
     protected:
         MccMount& _mount;
+        std::string_view _ident;
+
+        void enterImpl()
+        {
+            _mount.logWarn("call no-op MccMountState::enterImpl()");
+        }
+
+        void stopImpl()
+        {
+            _mount.logWarn("call no-op MccMountState::stopImpl()");
+        }
+
+
+        void exitImpl(std::derived_from<MccMountState> auto next_state)
+        {
+            _mount.setMountState(std::move(next_state));
+        }
     };
 
+    // default IDLE state
+    class MccMountStateIDLE : public MccMountState
+    {
+    public:
+        MccMountStateIDLE(MccMount& mount) : MccMountState(mount, "DEFAULT IDLE STATE") {}
+
+    private:
+        void enterImpl()
+        {
+            this->_mount.logInfo("Enter to defalut IDLE state");
+        }
+
+        void stopImpl()
+        {
+            this->_mount.logWarn("Ignore stop for default IDLE state!");
+        }
+    };
+
+
     /*  Constructors and destructor  */
 
     MccMount(traits::mcc_input_char_range auto const& logger_mark = "[MOUNT]",
diff --git a/cxx/mount_state.h b/cxx/mount_state.h
index 4efebd5..0083862 100644
--- a/cxx/mount_state.h
+++ b/cxx/mount_state.h
@@ -188,4 +188,10 @@ protected:
     std::function<void()> _stopFunc;
 };
 
+
+template <MccMountType MOUNT_TYPE, std::derived_from<MccMountConfig> CONFIG_TYPE = MccMountConfig>
+class MccMountStateSlew1 : public MccMount<MOUNT_TYPE, CONFIG_TYPE>::MccMountState
+{
+};
+
 }  // namespace mcc