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Core/Optional/Optional.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BITKit
+{
+    public interface IOptional
+    {
+        bool Allow { get; }
+        object Value { get; }
+    }
+    public interface IOptional<T>
+    {
+        bool Allow { get; }
+        T Value { get; }
+    }
+    [System.Serializable]
+    public record Optional<T> : IOptional<T>
+    {
+#if UNITY
+        [UnityEngine.SerializeField]
+        bool allow;
+        [UnityEngine.SerializeField]
+        T value;
+#else
+        bool allow;
+        T value;
+#endif
+        public bool Allow { get => allow; set => allow = value;}
+        public T Value { get => value; set => this.value = value; }
+        public void SetValueThenAllow(T newValue) => value = newValue;
+        public void Clear()
+        {
+            Allow = false;
+            value = default;
+        }
+    }
+}