SupaLidlGame/State/IState.cs

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namespace SupaLidlGame.State;
public interface IState<T> where T : IState<T>
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{
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/// <summary>
/// Called when this state is entered
/// </summary>
/// <remarks>
/// This returns a <c>IState</c> in case a state is being
/// transitioned to but wants to transition to another state. For
/// example, an attack state can return to an idle state, but that idle
/// state can override it to the move state immediately when necessary.
/// </remarks>
public IState<T> Enter(IState<T> previousState);
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/// <summary>
/// Called when the <c>Character</c> exits this <c>CharacterState</c>.
/// </summary>
public void Exit(IState<T> nextState);
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public IState<T> Process(double delta) => null;
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}