| use std::any::TypeId; |
| use std::collections::HashMap; |
| use std::hash::Hash; |
| |
| trait State { |
| type EventType; |
| fn get_type_id_of_state(&self) -> TypeId; |
| } |
| |
| struct StateMachine<EventType: Hash + Eq> { |
| current_state: Box<dyn State<EventType = EventType>>, |
| transition_table: |
| HashMap<TypeId, HashMap<EventType, fn() -> Box<dyn State<EventType = EventType>>>>, |
| } |
| |
| impl<EventType: Hash + Eq> StateMachine<EventType> { |
| fn inner_process_event(&mut self, event: EventType) -> Result<(), i8> { |
| let new_state_creation_function = self |
| .transition_table |
| .iter() |
| .find(|(&event_typeid, _)| event_typeid == self.current_state.get_type_id_of_state()) |
| .ok_or(1)? |
| .1 |
| .iter() |
| .find(|(&event_type, _)| event == event_type) |
| //~^ ERROR cannot move out of a shared reference |
| .ok_or(2)? |
| .1; |
| |
| self.current_state = new_state_creation_function(); |
| Ok(()) |
| } |
| } |
| |
| fn main() {} |
