Update generics example

Author: mackysoft

Assets/Example/Example_Contravariance.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+public interface IActor { }
+public interface IStandardActor : IActor { }
+public interface INetworkActor : IActor { }
+
+public interface IContravarianceAction<in T> where T : IActor {
+	void DoAction (T actor);
+}
+
+public interface ICovarianceAction<out T> where T : IActor
+{
+	T Actor { get; }
+}
+
+public interface IActorAction : IContravarianceAction<IActor>, ICovarianceAction<IActor> { }
+public interface IStandardActorAction : IContravarianceAction<IStandardActor>, ICovarianceAction<IStandardActor> { }
+public interface INetworkActorAction : IContravarianceAction<INetworkActor>, ICovarianceAction<INetworkActor> { }
+
+[Serializable]
+public sealed class StandardActorAction : IContravarianceAction<IStandardActor>, ICovarianceAction<IStandardActor>
+{
+	public void DoAction (IStandardActor actor)
+	{
+	}
+	public IStandardActor Actor => null;
+}
+
+[Serializable]
+public sealed class ActorAction : IContravarianceAction<IActor>, ICovarianceAction<IActor>
+{
+	public void DoAction (IActor actor)
+	{
+	}
+	public IActor Actor => null;
+}
+
+[Serializable]
+public abstract class BaseAction<T> : IContravarianceAction<T>, ICovarianceAction<T> where T : IActor
+{
+	public void DoAction (T actor) {
+	}
+	public T Actor => default;
+}
+
+[Serializable]
+public sealed class DerivedAction1 : BaseAction<IActor> { }
+
+[Serializable]
+public sealed class DerivedAction2 : BaseAction<INetworkActor> { }
+
+[Serializable]
+public sealed class DerivedAction3 : BaseAction<IStandardActor> { }
+
+[Serializable]
+public sealed class NetworkActorAction1 : INetworkActorAction
+{
+	public void DoAction (INetworkActor actor)
+	{
+	}
+	public INetworkActor Actor => null;
+}
+
+[Serializable]
+public sealed class NetworkActorAction2 : IContravarianceAction<INetworkActor>, ICovarianceAction<INetworkActor>
+{
+	public void DoAction (INetworkActor actor)
+	{
+	}
+	public INetworkActor Actor => null;
+}
+
+[Serializable]
+public sealed class NetworkActorAction3 : IContravarianceAction<IActor>, ICovarianceAction<IActor>
+{
+	public void DoAction (IActor actor)
+	{
+	}
+	public IActor Actor => null;
+}
+
+public class Example_Generics : MonoBehaviour
+{
+
+	[SerializeReference, SubclassSelector]
+	public List<IContravarianceAction<INetworkActor>> contravarianceActions = new List<IContravarianceAction<INetworkActor>>();
+
+	[SerializeReference, SubclassSelector]
+	public List<ICovarianceAction<INetworkActor>> covarianceActions = new List<ICovarianceAction<INetworkActor>>();
+
+}