Initial commit

Assets/Scripts/Data/Layer.cs

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+using System;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+namespace BracerLib.Data
+{
+    [Serializable, ExcludeFromCoverage]
+    public struct Layer : IEquatable<Layer>
+    {
+        public static implicit operator int(Layer layer)
+        {
+            return layer.layerIndex;
+        }
+
+        [SerializeField]
+        private int layerIndex;
+
+        public int LayerIndex
+        {
+            get => layerIndex;
+            set
+            {
+                if (value > 0 && value < 32)
+                    layerIndex = value;
+            }
+        }
+
+        public int Mask => 1 << layerIndex;
+
+        public bool Equals(Layer other) => layerIndex == other.layerIndex;
+
+        public override bool Equals(object obj) => obj is Layer other && Equals(other);
+
+        public override int GetHashCode() => layerIndex;
+
+        public static bool operator ==(Layer left, Layer right) => left.Equals(right);
+
+        public static bool operator !=(Layer left, Layer right) => !left.Equals(right);
+    }
+}

Assets/Scripts/Data/Layer.cs.meta

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+fileFormatVersion: 2
+guid: 5c4f8fe70c14aea4ea15d53ddb93f727