chore: initial commit

Assets/Feel/MMTools/Core/MMObservable/MMObservable.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace MoreMountains.Tools
+{
+	/// <summary>
+	/// This struct lets you declare observable properties.
+	/// For example, let's say you have a class called Character, and you declare its speed like so : 
+	/// 
+	/// public MMObservable<float> Speed;
+	/// 
+	/// then, in any other class, you can register to OnValueChanged events on that property (usually in OnEnable) :
+	/// 
+	/// protected virtual void OnEnable()
+	/// {
+	///     _myCharacter.Speed.OnValueChanged += OnSpeedChange;
+	/// }
+	/// 
+	/// and unsubscribe like so :
+	/// 
+	/// protected virtual void OnDisable()
+	/// {
+	///     _myCharacter.Speed.OnValueChanged -= OnSpeedChange;
+	/// }
+	/// 
+	/// and then all you need is a method to handle that speed change :
+	/// 
+	/// protected virtual void OnSpeedChange()
+	/// {
+	///     MMDebug.DebugLogInfo(_myCharacter.Speed.Value);
+	/// }
+	/// 
+	/// You can look at the MMObservableTest demo scene for an example of how it's used.
+	/// 
+	/// </summary>
+	/// <typeparam name="T"></typeparam>
+	public struct MMObservable<T>
+	{
+		public Action OnValueChanged;
+		public Action<T> OnValueChangedTo;
+		public Action<T,T> OnValueChangedFromTo;
+
+		private T _value;
+        
+		public T Value
+		{
+			get { return _value;  }
+			set
+			{
+				if (!EqualityComparer<T>.Default.Equals(value, _value))
+				{
+					var prev = _value;
+					_value = value;
+					OnValueChanged?.Invoke();
+					OnValueChangedTo?.Invoke(_value);
+					OnValueChangedFromTo?.Invoke(prev,_value);
+				}
+			}
+		}
+	}
+}

Assets/Feel/MMTools/Core/MMObservable/MMObservable.cs.meta

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