From be5a33f9b744827b228aa418fa87daf4b5c29496 Mon Sep 17 00:00:00 2001
From: Francisco Paisana <paisanaf@tcd.ie>
Date: Sun, 29 Mar 2020 21:08:29 +0100
Subject: [PATCH] deleted unused fsm methods

---
 lib/include/srslte/common/fsm.h | 60 +++++++++++++--------------------
 1 file changed, 23 insertions(+), 37 deletions(-)

diff --git a/lib/include/srslte/common/fsm.h b/lib/include/srslte/common/fsm.h
index eb210935e..8f65691ca 100644
--- a/lib/include/srslte/common/fsm.h
+++ b/lib/include/srslte/common/fsm.h
@@ -66,30 +66,30 @@ struct variant_convert {
 struct fsm_helper {
   //! Stayed in same state
   template <typename FSM, typename PrevState>
-  static void handle_state_transition(FSM* f, same_state s, PrevState* p)
+  static void handle_state_change(FSM* f, same_state* s, PrevState* p)
   {
     // do nothing
   }
   //! TargetState is type-erased. Apply its stored type to the fsm current state
   template <typename FSM, typename... Args, typename PrevState>
-  static void handle_state_transition(FSM* f, choice_t<Args...>& s, PrevState* p)
+  static void handle_state_change(FSM* f, choice_t<Args...>* s, PrevState* p)
   {
     fsm_details::variant_convert<decltype(f->states), PrevState> visitor{.v = &f->states, .p = p};
-    s.visit(visitor);
+    s->visit(visitor);
   }
   //! Simple state transition in FSM
   template <typename FSM, typename State, typename PrevState>
-  static auto handle_state_transition(FSM* f, State& s, PrevState* p) -> decltype(f->states = s, void())
+  static auto handle_state_change(FSM* f, State* s, PrevState* p) -> decltype(f->states = std::move(*s), void())
   {
     static_assert(not std::is_same<State, PrevState>::value, "State cannot transition to itself.\n");
-    f->states = s;
+    f->states = std::move(*s);
   }
   //! State not present in current FSM. Attempt state transition in parent FSM in the case of NestedFSM
   template <typename FSM, typename... Args>
-  static void handle_state_transition(FSM* f, Args&&... args)
+  static void handle_state_change(FSM* f, Args&&... args)
   {
     static_assert(FSM::is_nested, "State is not present in the FSM list of valid states");
-    handle_state_transition(f->parent_fsm()->derived(), args...);
+    handle_state_change(f->parent_fsm()->derived(), args...);
   }
 
   //! Trigger Event, that will result in a state transition
@@ -97,34 +97,35 @@ struct fsm_helper {
   struct trigger_visitor {
     trigger_visitor(FSM* f_, Event&& ev_) : f(f_), ev(std::forward<Event>(ev_)) {}
 
-    template <typename State>
-    void operator()(State& s)
+    //! Trigger visitor callback for the current state
+    template <typename CurrentState>
+    void operator()(CurrentState& s)
     {
-      call_trigger(s);
+      call_trigger(&s);
     }
 
+    //! Compute next state type
     template <typename State>
     using NextState = decltype(std::declval<FSM>().react(std::declval<State&>(), std::declval<Event>()));
 
+    //! In case a react(CurrentState&, Event) method is found
     template <typename State>
-    auto call_trigger(State& s) -> NextState<State>
+    auto call_trigger(State* current_state) -> NextState<State>
     {
       using next_state = NextState<State>;
       static_assert(not std::is_same<next_state, State>::value, "State cannot transition to itself.\n");
-      auto target_state = f->react(s, std::move(ev));
-      fsm_helper::handle_state_transition(f, target_state, &s);
+      auto target_state = f->react(*current_state, std::move(ev));
+      fsm_helper::handle_state_change(f, &target_state, current_state);
       return target_state;
     }
+    //! In case a react(CurrentState&, Event) method is not found, but we are in a NestedFSM with a trigger method
     template <typename State>
-    auto call_trigger(State& s) -> decltype(std::declval<State>().trigger(std::declval<Event>()))
+    auto call_trigger(State* s) -> decltype(std::declval<State>().trigger(std::declval<Event>()))
     {
-      s.trigger(std::move(ev));
-    }
-    same_state call_trigger(...)
-    {
-      // do nothing if no react was found
-      return same_state{};
+      s->trigger(std::move(ev));
     }
+    //! No trigger or react method found. Do nothing
+    void call_trigger(...) {}
 
     FSM*  f;
     Event ev;
@@ -158,7 +159,6 @@ public:
     using Derived::react;
     using Derived::states;
   };
-
   static const bool is_nested = false;
 
   virtual const char* name() const = 0;
@@ -167,7 +167,8 @@ public:
   template <typename Ev>
   void trigger(Ev&& e)
   {
-    fwd_trigger(std::forward<Ev>(e));
+    fsm_details::fsm_helper::trigger_visitor<derived_view, Ev> visitor{derived(), std::forward<Ev>(e)};
+    derived()->states.visit(visitor);
   }
 
   template <typename State>
@@ -192,20 +193,6 @@ public:
 protected:
   friend struct fsm_details::fsm_helper;
 
-  // Forward an event to FSM states and handle transition return
-  template <typename Ev>
-  void fwd_trigger(Ev&& e)
-  {
-    fsm_details::fsm_helper::trigger_visitor<derived_view, Ev> visitor{derived(), std::forward<Ev>(e)};
-    derived()->states.visit(visitor);
-  }
-
-  template <typename State>
-  void change_state(State& s)
-  {
-    derived()->states = std::move(s);
-  }
-
   // Access to CRTP derived class
   derived_view*       derived() { return static_cast<derived_view*>(this); }
   const derived_view* derived() const { return static_cast<const derived_view*>(this); }
@@ -228,7 +215,6 @@ public:
   parent_t*       parent_fsm() { return fsm_ptr; }
 
 protected:
-  friend struct fsm_details::fsm_helper;
   using parent_fsm_t = ParentFSM;
 
   ParentFSM* fsm_ptr = nullptr;