refactor(backmp11): event pool container config

Author: chandryan

doc/modules/ROOT/pages/tutorial/backmp11-back-end.adoc

@@ -70,7 +70,7 @@ struct default_state_machine_config
     using compile_policy = favor_runtime_speed;
     // Which container to use for the event pool.
     template <typename T>
-    using event_container = std::deque<T>;
+    using event_pool_container = std::deque<T>;
     // Type of the Fsm parameter passed in actions and guards.
     using fsm_parameter = local_transition_owner;
     // Identifier for the upper-most SM
@@ -169,7 +169,7 @@ The state machine utilizes an event pool for events that are not processed immed
 - `erase(iterator)`
 - `clear()`
 
-You can deactivate the event pool with `using event_container = no_event_container;`. A state machine requires the event pool to handle completion events, deferred events, and enqueued events.
+You can deactivate the event pool with `using event_pool_container = no_event_pool_container<T>;`. A state machine requires the event pool to handle completion events, deferred events, and enqueued events.
 
 
 === Compile policy

include/boost/msm/backmp11/detail/state_machine_base.hpp

@@ -199,18 +199,19 @@ class state_machine_base : public FrontEnd
   protected:
     using processable_event = basic_polymorphic<event_occurrence>;
     template <typename T>
-    using event_container = typename config_t::template event_container<T>;
-    using event_container_t = event_container<processable_event>;
+    using event_pool_container =
+        typename config_t::template event_pool_container<T>;
+    using event_pool_container_t = event_pool_container<processable_event>;
 
     struct event_pool_t
     {
-        event_container_t events;
+        event_pool_container_t events;
         uint16_t cur_seq_cnt{};
     };
 
     using event_pool_member = optional_instance<
         event_pool_t,
-        !std::is_same_v<event_container<void>, no_event_container<void>>>;
+        !std::is_same_v<event_pool_container<void>, no_event_pool_container<void>>>;
 
     template <bool C = event_pool_member::value,
               typename = std::enable_if_t<C>>

include/boost/msm/backmp11/detail/transition_table.hpp

@@ -448,10 +448,10 @@ struct transition_table_impl
     using completion_transition_table =
         mp11::mp_copy_if<transition_table, has_completion_event>;
     static_assert(
-        mp11::mp_empty<completion_transition_table>::value || 
-        !std::is_same_v<
-            typename StateMachine::template event_container<void>,
-            no_event_container<void>>,
+        mp11::mp_empty<completion_transition_table>::value ||
+            !std::is_same_v<
+                typename StateMachine::template event_pool_container<void>,
+                no_event_pool_container<void>>,
         "Completion transitions require an event pool");
     template <typename State, typename Table = completion_transition_table>
     struct completion_transitions_impl

include/boost/msm/backmp11/state_machine_config.hpp

@@ -49,7 +49,7 @@ struct local_transition_owner{};
 
 // Config for disabling the event pool.
 template <typename T>
-struct no_event_container;
+struct no_event_pool_container;
 
 using transition_owner [[deprecated("Use local_transition_owner instead")]] =
     local_transition_owner;
@@ -65,7 +65,7 @@ struct default_state_machine_config
     using compile_policy = favor_runtime_speed;
     // Which container to use for the event pool.
     template <typename T>
-    using event_container = std::deque<T>;
+    using event_pool_container = std::deque<T>;
     // Type of the Fsm parameter passed in actions and guards.
     using fsm_parameter = local_transition_owner;
     // Identifier for the upper-most SM

test/Backmp11.hpp

@@ -28,7 +28,7 @@ class StateMachine
 {
     using base = state_machine<FrontEnd, Config, StateMachine<FrontEnd, Config>>;
   public:
-    const typename base::event_container_t& get_pending_events() const
+    const typename base::event_pool_container_t& get_pending_events() const
     {
         return this->get_event_pool().events;
     }

test/Backmp11Transitions.cpp

@@ -81,7 +81,7 @@ struct default_config : state_machine_config
 {
     // using root_sm = StateMachine;
     template <typename T>
-    using event_container = no_event_container<T>;
+    using event_pool_container = no_event_pool_container<T>;
 };
 struct favor_compile_time_config : default_config
 {