From fa514531bf75e52a66638dda2964d6c1cef6207d Mon Sep 17 00:00:00 2001
From: Syntriax <syntriax@gmail.com>
Date: Tue, 3 Mar 2026 23:30:56 +0300
Subject: [PATCH] feat: added IIdentifiable comparison interface & IsIdentical
 extension method

---
 Engine.Core/Abstract/IIdentifiable.cs            | 2 +-
 Engine.Core/BaseEntity.cs                        | 2 ++
 Engine.Core/Extensions/IdentifiableExtensions.cs | 7 +++++++
 3 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 Engine.Core/Extensions/IdentifiableExtensions.cs

diff --git a/Engine.Core/Abstract/IIdentifiable.cs b/Engine.Core/Abstract/IIdentifiable.cs
index c4cd50a..403cace 100644
--- a/Engine.Core/Abstract/IIdentifiable.cs
+++ b/Engine.Core/Abstract/IIdentifiable.cs
@@ -3,7 +3,7 @@ namespace Engine.Core;
 /// <summary>
 /// Represents any instance in the engine with an id.
 /// </summary>
-public interface IIdentifiable
+public interface IIdentifiable : System.IComparable<IIdentifiable>
 {
     /// <summary>
     /// Event triggered when the <see cref="Id"/> of the <see cref="IIdentifiable"/> changes.
diff --git a/Engine.Core/BaseEntity.cs b/Engine.Core/BaseEntity.cs
index e259b21..87982f2 100644
--- a/Engine.Core/BaseEntity.cs
+++ b/Engine.Core/BaseEntity.cs
@@ -101,4 +101,6 @@ public abstract class BaseEntity : IEntity
 
     protected BaseEntity() => Id = Guid.NewGuid().ToString("D");
     protected BaseEntity(string id) => Id = id;
+
+    public int CompareTo(IIdentifiable? other) => Id.CompareTo(other?.Id);
 }
diff --git a/Engine.Core/Extensions/IdentifiableExtensions.cs b/Engine.Core/Extensions/IdentifiableExtensions.cs
new file mode 100644
index 0000000..35d7d02
--- /dev/null
+++ b/Engine.Core/Extensions/IdentifiableExtensions.cs
@@ -0,0 +1,7 @@
+namespace Engine.Core;
+
+public static class IdentifiableExtensions
+{
+    public static bool IsIdentical(this IIdentifiable? left, IIdentifiable? right)
+        => left?.CompareTo(right) == 0;
+}