Introduce State<T> for Enums

csharp/Lib/Units/State.cs

@@ -34,4 +34,11 @@ public readonly struct State : IReadOnlyList<String>
 
     public Int32 Count => Values.Count;
     public String this[Int32 index] => Values[index];
-}
+
+    public static State<T> From<T>(T t) where T : Enum
+    {
+        return new State<T>(t);
+    }
+}
+
+

csharp/Lib/Units/StateOfT.cs

@@ -0,0 +1,27 @@
+using System.Collections;
+
+namespace InnovEnergy.Lib.Units;
+
+public readonly struct State<T> : IReadOnlyList<T> where T:Enum
+{
+    public IReadOnlyList<T> Values { get; }
+    
+    public State(IReadOnlyList<T> values) => Values = values;
+
+    public State(params T[] values) : this((IReadOnlyList<T>)values){}
+    public State(params State<T>[] states) : this((IReadOnlyList<T>)states.SelectMany(s => s.Values).ToList()){}
+
+    public static implicit operator State<T>(T s)       => new((IReadOnlyList<T>)s);
+    public static implicit operator State<T>(List<T> s) => new((IReadOnlyList<T>)s);
+    public static implicit operator State<T>(T[] s)     => new((IReadOnlyList<T>)s);
+    
+    public static State<T> operator |(State<T> left, State<T> right) => new State<T>(left, right);
+
+    public IEnumerator<T> GetEnumerator() => Values.GetEnumerator();
+
+    public override String ToString() => String.Join("; ", Values);
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+    public Int32 Count => Values.Count;
+    public T this[Int32 index] => Values[index];
+}