From dec2e9fe11a7e95f7a8d19a6dc8f6f03e616bc44 Mon Sep 17 00:00:00 2001
From: Andrei Sergeev <a.sergeev.official@gmail.com>
Date: Thu, 24 Aug 2023 09:59:21 +0400
Subject: [PATCH] Add Builder AddRange from ReadOnlySpan

---
 ...FlatArray.Builder.AddRange.ReadOnlySpan.cs | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 src/flatcollections-array/FlatArray/FlatArray.T.Builder/FlatArray.Builder.AddRange.ReadOnlySpan.cs

diff --git a/src/flatcollections-array/FlatArray/FlatArray.T.Builder/FlatArray.Builder.AddRange.ReadOnlySpan.cs b/src/flatcollections-array/FlatArray/FlatArray.T.Builder/FlatArray.Builder.AddRange.ReadOnlySpan.cs
new file mode 100644
index 00000000..1b442d6c
--- /dev/null
+++ b/src/flatcollections-array/FlatArray/FlatArray.T.Builder/FlatArray.Builder.AddRange.ReadOnlySpan.cs
@@ -0,0 +1,22 @@
+namespace System;
+
+partial struct FlatArray<T>
+{
+    partial class Builder
+    {
+        // TODO: Add the tests and make public
+        internal Builder AddRange(ReadOnlySpan<T> items)
+        {
+            if (items.IsEmpty)
+            {
+                return this;
+            }
+
+            InnerBufferHelperEx.EnsureBufferCapacity(ref this.items, length, items.Length);
+            items.CopyTo(new Span<T>(this.items, length, items.Length));
+            length += items.Length;
+
+            return this;
+        }
+    }
+}