From 655c8b72a590d2b3f0d3aab04a659f646f049867 Mon Sep 17 00:00:00 2001
From: Ahson Khan <ahkha@microsoft.com>
Date: Mon, 13 Nov 2017 21:11:53 -0800
Subject: [PATCH] Adding Memory CopyTo APIs (#15010)

---
 src/mscorlib/shared/System/Memory.cs         | 23 +++++++++++++++++++++++
 src/mscorlib/shared/System/ReadOnlyMemory.cs | 23 +++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/src/mscorlib/shared/System/Memory.cs b/src/mscorlib/shared/System/Memory.cs
index c00de30..d83bd58 100644
--- a/src/mscorlib/shared/System/Memory.cs
+++ b/src/mscorlib/shared/System/Memory.cs
@@ -199,6 +199,29 @@ namespace System
             }
         }
 
+        /// <summary>
+        /// Copies the contents of the memory into the destination. If the source
+        /// and destination overlap, this method behaves as if the original values are in
+        /// a temporary location before the destination is overwritten.
+        ///
+        /// <param name="destination">The Memory to copy items into.</param>
+        /// <exception cref="System.ArgumentException">
+        /// Thrown when the destination is shorter than the source.
+        /// </exception>
+        /// </summary>
+        public void CopyTo(Memory<T> destination) => Span.CopyTo(destination.Span);
+
+        /// <summary>
+        /// Copies the contents of the memory into the destination. If the source
+        /// and destination overlap, this method behaves as if the original values are in
+        /// a temporary location before the destination is overwritten.
+        ///
+        /// <returns>If the destination is shorter than the source, this method
+        /// return false and no data is written to the destination.</returns>
+        /// </summary>
+        /// <param name="destination">The span to copy items into.</param>
+        public bool TryCopyTo(Memory<T> destination) => Span.TryCopyTo(destination.Span);
+
         public unsafe MemoryHandle Retain(bool pin = false)
         {
             MemoryHandle memoryHandle;
diff --git a/src/mscorlib/shared/System/ReadOnlyMemory.cs b/src/mscorlib/shared/System/ReadOnlyMemory.cs
index 5240a37..1b163dd 100644
--- a/src/mscorlib/shared/System/ReadOnlyMemory.cs
+++ b/src/mscorlib/shared/System/ReadOnlyMemory.cs
@@ -176,6 +176,29 @@ namespace System
             }
         }
 
+        /// <summary>
+        /// Copies the contents of the read-only memory into the destination. If the source
+        /// and destination overlap, this method behaves as if the original values are in
+        /// a temporary location before the destination is overwritten.
+        ///
+        /// <param name="destination">The Memory to copy items into.</param>
+        /// <exception cref="System.ArgumentException">
+        /// Thrown when the destination is shorter than the source.
+        /// </exception>
+        /// </summary>
+        public void CopyTo(Memory<T> destination) => Span.CopyTo(destination.Span);
+
+        /// <summary>
+        /// Copies the contents of the readonly-only memory into the destination. If the source
+        /// and destination overlap, this method behaves as if the original values are in
+        /// a temporary location before the destination is overwritten.
+        ///
+        /// <returns>If the destination is shorter than the source, this method
+        /// return false and no data is written to the destination.</returns>
+        /// </summary>
+        /// <param name="destination">The span to copy items into.</param>
+        public bool TryCopyTo(Memory<T> destination) => Span.TryCopyTo(destination.Span);
+
         /// <summary>Creates a handle for the memory.</summary>
         /// <param name="pin">
         /// If pin is true, the GC will not move the array until the returned <see cref="MemoryHandle"/>
-- 
2.7.4