Added extension methods

Assets/MackySoft/MackySoft.Modiferty/Scripts/IModifier.cs

@@ -1,18 +1,20 @@
 namespace MackySoft.Modiferty {
 
-	public interface IModifier<T> {
-
+	public interface IModifier {
 		/// <summary>
 		/// <para> Priority of evaluation. </para>
 		/// <para> See: <see cref="ModifierList{T}.Evaluate(T)"/> </para>
 		/// </summary>
 		int Priority { get; }
+	}
 
+	public interface IModifier<T> : IModifier {
 		/// <summary>
 		/// Evaluate the value.
 		/// </summary>
 		/// <param name="value"> Value to be modified. </param>
 		T Evaluate (T value);
 
 	}
+
 }

Assets/MackySoft/MackySoft.Modiferty/Scripts/ModifierListExtensions.cs

@@ -0,0 +1,39 @@
+using System.Collections.Generic;
+
+namespace MackySoft.Modiferty {
+	public static class ModifierListExtensions {
+
+		public static bool HasModifier<TModifier> (this IEnumerable<IModifier> source) where TModifier : IModifier {
+			foreach (IModifier modifier in source) {
+				if (modifier is TModifier) {
+					return true;
+				}
+			}
+			return false;
+		}
+
+		public static TModifier GetModifier<TModifier> (this IEnumerable<IModifier> source) where TModifier : IModifier {
+			foreach (IModifier modifier in source) {
+				if (modifier is TModifier result) {
+					return result;
+				}
+			}
+			return default;
+		}
+
+		public static IEnumerable<TModifier> GetModifiers<TModifier> (this IEnumerable<IModifier> source) where TModifier : IModifier {
+			foreach (IModifier modifier in source) {
+				if (modifier is TModifier result) {
+					yield return result;
+				}
+			}
+		}
+
+		public static bool TryGetModifier<TModifier> (this IEnumerable<IModifier> source,out TModifier result) where TModifier : IModifier {
+			result = source.GetModifier<TModifier>();
+			return result != null;
+		}
+
+	}
+
+}

Assets/MackySoft/MackySoft.Modiferty/Scripts/Modifiers/CreateModifier.cs

@@ -1,17 +1,35 @@
 using System;
+using UnityEngine;
 
 namespace MackySoft.Modiferty {
+
+	/// <summary>
+	/// Create complex modifier improvise.
+	/// </summary>
+	[Serializable]
 	public class CreateModifier<T> : IModifier<T> {
 
-		public Func<T,T> ModifyMethod { get; set; }
-		public int Priority { get; set; }
+		[SerializeField]
+		int m_Priority;
+
+		[NonSerialized]
+		Func<T,T> m_Evaluator;
+
+		public Func<T,T> Evaluator {
+			get => m_Evaluator;
+			set => m_Evaluator = value ?? throw new NullReferenceException($"You cannot set the {nameof(Evaluator)} to null.");
+		}
+
+		public int Priority { get => m_Priority; set => m_Priority = value; }
 
-		public CreateModifier (Func<T,T> modifyMethod) {
-			ModifyMethod = modifyMethod;
+		/// <param name="evaluator"> Evaluator can not be null. </param>
+		public CreateModifier (Func<T,T> evaluator,int priority = 0) {
+			Evaluator = evaluator ?? throw new ArgumentNullException(nameof(evaluator));
+			Priority = priority;
 		}
 
 		public T Evaluate (T value) {
-			return ModifyMethod.Invoke(value);
+			return Evaluator.Invoke(value);
 		}
 
 	}

Assets/MackySoft/MackySoft.Modiferty/Scripts/Properties/ModifiableInt.cs

@@ -12,7 +12,7 @@ public ModifiableInt (int baseValue) : base(baseValue) {
 	#region Operator Modifiers
 
 	[Serializable]
-	public class AdditiveModifier : IModifier<int> {
+	public class AdditiveModifierInt : IModifier<int> {
 
 		[SerializeField]
 		int m_Amount;
@@ -24,7 +24,7 @@ public class AdditiveModifier : IModifier<int> {
 
 		public int Priority { get => m_Priority; set => m_Priority = value; }
 
-		public AdditiveModifier (int amount) {
+		public AdditiveModifierInt (int amount) {
 			Amount = amount;
 		}
 
@@ -34,7 +34,7 @@ public int Evaluate (int value) {
 	}
 
 	[Serializable]
-	public class SubtractiveModifier : IModifier<int> {
+	public class SubtractiveModifierInt : IModifier<int> {
 
 		[SerializeField]
 		int m_Amount;
@@ -46,7 +46,7 @@ public class SubtractiveModifier : IModifier<int> {
 
 		public int Priority { get => m_Priority; set => m_Priority = value; }
 
-		public SubtractiveModifier (int amount) {
+		public SubtractiveModifierInt (int amount) {
 			Amount = amount;
 		}
 
@@ -56,7 +56,7 @@ public int Evaluate (int value) {
 	}
 
 	[Serializable]
-	public class MultiplyModifier : IModifier<int> {
+	public class MultiplyModifierInt : IModifier<int> {
 
 		[SerializeField]
 		int m_Multiply = 1;
@@ -68,7 +68,7 @@ public class MultiplyModifier : IModifier<int> {
 
 		public int Priority { get => m_Priority; set => m_Priority = value; }
 
-		public MultiplyModifier (int multiply) {
+		public MultiplyModifierInt (int multiply) {
 			Multiply = multiply;
 		}
 
@@ -79,7 +79,7 @@ public int Evaluate (int value) {
 	}
 
 	[Serializable]
-	public class DivisionModifier : IModifier<int> {
+	public class DivisionModifierInt : IModifier<int> {
 
 		[SerializeField]
 		int m_Division = 2;
@@ -91,7 +91,7 @@ public class DivisionModifier : IModifier<int> {
 
 		public int Priority { get => m_Priority; set => m_Priority = value; }
 
-		public DivisionModifier (int division) {
+		public DivisionModifierInt (int division) {
 			Division = division;
 		}
 

README.md

@@ -53,12 +53,13 @@ public class Character : MonoBehaviour {
 
 public class PowerUpItem : MonoBehaviour {
 
-	public AdditiveModifier additiveDamage = new AdditiveModifier(1);
+	public AdditiveModifierInt additivePower = new AdditiveModifierInt(1);
 
 	public void Modify (Character target){
-		target.attackPower.Modifiers.Add(additiveDamage);
-		// target.attackPower.Add(additiveDamage);
-
+		target.attackPower.Modifiers.Add(additivePower);
+
+		// Same as below.
+		// target.attackPower.Add(additivePower);
 	}
 
 }
@@ -97,7 +98,7 @@ A variety of other unique modifiers are also available.
 The given value ignored and the specified value returned.
 
 ```cs
-var setModifier = new SetModifier(0);
+var setModifier = new SetModifierInt(0);
 
 character.attackPower.Add(setModifier);