From 099d5368db5ac884535f70893163d77ccb40a0c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joaquin=20Mu=C3=B1iz?= <joaco.munix@gmail.com>
Date: Fri, 14 Nov 2025 09:35:58 -0300
Subject: [PATCH] Add RemoveRange to UnsafeList

(cherry picked from commit 44d96fc254aa889c4221288b7fdc9603f633c6b8)
---
 Arch.LowLevel/UnsafeList.cs | 40 +++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/Arch.LowLevel/UnsafeList.cs b/Arch.LowLevel/UnsafeList.cs
index b028aad..f4545f2 100644
--- a/Arch.LowLevel/UnsafeList.cs
+++ b/Arch.LowLevel/UnsafeList.cs
@@ -162,6 +162,46 @@ public bool Remove(T item)
         return true;
     }
     
+    /// <summary>
+    /// Removes a contiguous range of elements from the list and shifts the remaining elements down
+    /// to fill the gap.
+    /// </summary>
+    /// <param name="start">
+    /// The starting index of the range to remove. Must be within the bounds of the list.
+    /// </param>
+    /// <param name="count">
+    /// The number of elements to remove. Must be non-negative and not exceed the remaining elements
+    /// beyond <paramref name="start"/>.
+    /// </param>
+    /// <exception cref="ArgumentOutOfRangeException">
+    /// Thrown if <paramref name="start"/> or <paramref name="count"/> define a range outside
+    /// the bounds of the list.
+    /// </exception>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void RemoveRange(int start, int count)
+    {
+        if (start > Count)
+            throw new ArgumentOutOfRangeException(nameof(start));
+        if (count > Count - start)
+            throw new ArgumentOutOfRangeException(nameof(count));
+        if (count == 0)
+            return;
+
+        // Calculate the tail size to move
+        var tail = Count - (start + count);
+        if (tail > 0)
+        {
+            // Move the tail down over the removed range
+            Unsafe.CopyBlock(
+                destination: (byte*)(_array._ptr + start),
+                source: (byte*)(_array._ptr + start + count),
+                byteCount: (uint)(tail * sizeof(T))
+            );
+        }
+
+        Count -= count;
+    }
+    
     /// <summary>
     ///     Checks if the item is containted in this <see cref="UnsafeList{T}"/> instance and returns its index.
     /// </summary>