add project files

Assets/Scripts/Toolkit/OHM/UnityToolkit/RandomExtensions.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using Random = System.Random;
+using System.Runtime.Serialization.Formatters.Binary;
+using UnityEngine;
+
+namespace OHM.UnityToolkit
+{
+	public static class RandomExtensions
+	{
+		public static RandomState Save(Random random)
+		{
+			using (MemoryStream stream = new MemoryStream())
+			{
+				new BinaryFormatter().Serialize(stream, random);
+				return new RandomState(stream.ToArray());
+			}
+		}
+
+		public static Random Restore(RandomState state)
+		{
+			using (MemoryStream stream = new MemoryStream(state.State))
+			{
+				return (Random)new BinaryFormatter().Deserialize(stream);
+			}
+		}
+
+		public static bool Bool(Random random)
+		{
+			return random.NextDouble() >= 0.5;
+		}
+
+		public static int MinMax(Random random, int n1, int n2)
+		{
+			if (n1 == n2)
+			{
+				return n1;
+			}
+			int lo = Mathf.Min(n1, n2);
+			int hi = Mathf.Max(n1, n2);
+			return lo + random.Next() % (hi - lo + 1);
+		}
+
+		public static int ListIndex(Random random, int listCount)
+		{
+			return MinMax(random, 0, listCount - 1);
+		}
+
+		public static int ListIndex(Random random, ICollection collection)
+		{
+			return ListIndex(random, collection.Count);
+		}
+
+		public static T ListElem<T>(Random random, List<T> list)
+		{
+			return default(T);
+		}
+
+		public static float MinMax(Random random, float min, float max)
+		{
+			return (float)((double)(max - min) * random.NextDouble() + (double)min);
+		}
+
+	}
+}