Initial Commit

Assets/Scripts/Util/Optional.cs

@@ -0,0 +1,98 @@
+using DefaultNamespace;
+using System;
+
+namespace Assets.Scripts.Util
+{
+	[Serializable]
+	public struct Optional<T> where T : struct
+	{
+		private bool1 hasValue;
+		internal T value;
+
+		public Optional(T value)
+		{
+			this.value = value;
+			hasValue = true;
+		}
+
+		public Optional(T? value)
+		{
+			hasValue = value.HasValue;
+			this.value = hasValue ? value.Value : default;
+		}
+
+		public bool HasValue => hasValue;
+
+		public T Value
+		{
+			get
+			{
+				if (!hasValue)
+				{
+					throw new InvalidOperationException("No Value");
+				}
+				return value;
+			}
+		}
+
+		public T GetValueOrDefault()
+		{
+			return value;
+		}
+
+		public T GetValueOrDefault(T defaultValue)
+		{
+			if (!hasValue)
+			{
+				return defaultValue;
+			}
+			return value;
+		}
+
+		public override bool Equals(object other)
+		{
+			if (!hasValue)
+			{
+				return other == null;
+			}
+			if (other == null)
+			{
+				return false;
+			}
+			return value.Equals(other);
+		}
+
+		public override int GetHashCode()
+		{
+			if (!hasValue)
+			{
+				return 0;
+			}
+			return value.GetHashCode();
+		}
+
+		public override string ToString()
+		{
+			if (!hasValue)
+			{
+				return "";
+			}
+			return value.ToString();
+		}
+
+		public static implicit operator Optional<T>(T? value)
+		{
+			return new Optional<T>(value);
+		}
+
+		public static implicit operator Optional<T>(T value)
+		{
+			return new Optional<T>(value);
+		}
+
+		public static explicit operator T(Optional<T> value)
+		{
+			return value.Value;
+		}
+	}
+}