ForceInvalidate experiments (see #21)

playground/Playground.cs

@@ -2,34 +2,34 @@
 using System.Diagnostics;
 using System.Threading.Tasks;
 using TinkState;
+using TinkState.Internal;
+
+class MutableObject
+{
+	public string Field = "initial";
+}
 
 class Playground
 {
-    static async Task Main()
+    static void Main()
     {
-        var stateA = Observable.State("hello");
-        var stateB = Observable.State("world");
-
-        var o = Observable.Auto(async () =>
-        {
-            Console.WriteLine("computing");
-            var a = stateA.Value;
-            await Task.Delay(1000);
-            var b = stateB.Value;
-            return a + " " + b;
-        });
-
-        o.Bind(result => Console.WriteLine(result.Status switch
-        {
-            AsyncComputeStatus.Loading => "Loading...",
-            AsyncComputeStatus.Done => "Done: " + result.Result,
-            AsyncComputeStatus.Failed => "Failed: " + result.Exception,
-        }));
-
-        await Task.Delay(1500);
-
-        stateB.Value = "Dan";
-
-        Process.GetCurrentProcess().WaitForExit();
+
+	    var mutableObject = new MutableObject();
+	    var state = Observable.State(mutableObject, NeverEqualityComparer<MutableObject>.Instance);
+
+	    void Mutate(string newValue)
+	    {
+		    mutableObject.Field = newValue;
+		    state.ForceInvalidate();
+	    }
+
+	    var auto = Observable.Auto(() => state.Value.Field.ToUpperInvariant());
+
+	    state.Bind(o => Console.WriteLine("Field value: " + o.Field));
+	    auto.Bind(value => Console.WriteLine("Field value: " + value));
+
+	    Mutate("hello");
+
+        // Process.GetCurrentProcess().WaitForExit();
     }
 }

src/TinkState/Runtime/Internal/NeverEqualityComparer.cs

@@ -3,7 +3,7 @@
 
 namespace TinkState.Internal
 {
-	class NeverEqualityComparer<T> : IEqualityComparer<T>
+	public class NeverEqualityComparer<T> : IEqualityComparer<T>
 	{
 		public static readonly NeverEqualityComparer<T> Instance = new NeverEqualityComparer<T>();
 

src/TinkState/Runtime/Internal/State.cs

@@ -30,6 +30,11 @@ public T Value
 			}
 		}
 
+		public void ForceInvalidate()
+		{
+			Fire();
+		}
+
 		public IDisposable Bind(Action<T> callback, IEqualityComparer<T> comparer = null, Scheduler scheduler = null)
 		{
 			return new Binding<T>(this, callback, comparer, scheduler);

src/TinkState/Runtime/State.cs

@@ -14,5 +14,8 @@ public interface State<T> : Observable<T>
 		/// </remarks>
 		/// <value>Current value of this observable object.</value>
 		new T Value { get; set; }
+
+		// TODO: better name
+		void ForceInvalidate();
 	}
 }