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C# StateMachine
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| //============================================================================= | |
| // Licensed under CC0. Takanori Shibasaki | |
| //============================================================================= | |
| using System.Collections.Generic; | |
| using System.Runtime.CompilerServices; | |
| public abstract class StateBase | |
| { | |
| public virtual void Begin() { } | |
| public virtual void End() { } | |
| } | |
| public abstract class GenericState<OwnerType> : StateBase where OwnerType : class | |
| { | |
| OwnerType m_Owner; | |
| protected OwnerType Owner | |
| { | |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] | |
| get | |
| { | |
| return m_Owner; | |
| } | |
| } | |
| public virtual void Setup(OwnerType owner) | |
| { | |
| m_Owner = owner; | |
| } | |
| public virtual void Reset() | |
| { | |
| m_Owner = null; | |
| } | |
| } | |
| public static class StatePool<OwnerType, StateType> | |
| where OwnerType : class | |
| where StateType : GenericState<OwnerType> | |
| { | |
| static List<StateType> m_States = new List<StateType>(); | |
| public static T Get<T>() where T : StateType, new() | |
| { | |
| var list = m_States; | |
| T result; | |
| for (var i = 0; i < list.Count; ++i) | |
| { | |
| if (list[i].GetType() == typeof(T)) | |
| { | |
| result = list[i] as T; | |
| list.RemoveAt(i); | |
| return result; | |
| } | |
| } | |
| result = new T(); | |
| return result; | |
| } | |
| public static void Release(StateType state) | |
| { | |
| state.Reset(); | |
| m_States.Add(state); | |
| } | |
| } | |
| public struct StateMachine<OwnerType, StateType> | |
| : System.IDisposable | |
| where OwnerType : class | |
| where StateType : GenericState<OwnerType> | |
| { | |
| public readonly OwnerType Owner; | |
| StateType m_State; | |
| public StateMachine(OwnerType owner) | |
| { | |
| Owner = owner; | |
| m_State = null; | |
| } | |
| public StateType Current | |
| { | |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] | |
| get | |
| { | |
| return m_State; | |
| } | |
| } | |
| public void Dispose() | |
| { | |
| if (m_State != null) | |
| { | |
| m_State.End(); | |
| StatePool<OwnerType, StateType>.Release(m_State); | |
| m_State = null; | |
| } | |
| } | |
| public bool IsInState<T>() where T: StateType | |
| { | |
| return m_State is T; | |
| } | |
| public T GotoState<T>() where T : StateType, new() | |
| { | |
| if (m_State != null) | |
| { | |
| m_State.End(); | |
| StatePool<OwnerType, StateType>.Release(m_State); | |
| m_State = null; | |
| } | |
| var nextState = StatePool<OwnerType, StateType>.Get<T>(); | |
| nextState.Setup(Owner); | |
| nextState.Begin(); | |
| m_State = nextState; | |
| return nextState; | |
| } | |
| } |
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