Added [ReadOnly]Memory<T>.AsBytes extensions

Author: Sergio0694

Microsoft.Toolkit.HighPerformance/Extensions/MemoryExtensions.cs

@@ -16,6 +16,23 @@ namespace Microsoft.Toolkit.HighPerformance.Extensions
     /// </summary>
     public static class MemoryExtensions
     {
+        /// <summary>
+        /// Casts a <see cref="Memory{T}"/> of one primitive type <typeparamref name="T"/> to <see cref="Memory{T}"/> of bytes.
+        /// </summary>
+        /// <typeparam name="T">The type if items in the source <see cref="Memory{T}"/>.</typeparam>
+        /// <param name="memory">The source <see cref="Memory{T}"/>, of type <typeparamref name="T"/>.</param>
+        /// <returns>A <see cref="Memory{T}"/> of bytes.</returns>
+        /// <exception cref="OverflowException">
+        /// Thrown if the <see cref="Memory{T}.Length"/> property of the new <see cref="Memory{T}"/> would exceed <see cref="int.MaxValue"/>.
+        /// </exception>
+        [Pure]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static Memory<byte> AsBytes<T>(this Memory<T> memory)
+            where T : unmanaged
+        {
+            return MemoryMarshal.AsMemory(((ReadOnlyMemory<T>)memory).Cast<T, byte>());
+        }
+
         /// <summary>
         /// Casts a <see cref="Memory{T}"/> of one primitive type <typeparamref name="TFrom"/> to another primitive type <typeparamref name="TTo"/>.
         /// </summary>

Microsoft.Toolkit.HighPerformance/Extensions/ReadOnlyMemoryExtensions.cs

@@ -19,6 +19,23 @@ namespace Microsoft.Toolkit.HighPerformance.Extensions
     /// </summary>
     public static class ReadOnlyMemoryExtensions
     {
+        /// <summary>
+        /// Casts a <see cref="ReadOnlyMemory{T}"/> of one primitive type <typeparamref name="T"/> to <see cref="ReadOnlyMemory{T}"/> of bytes.
+        /// </summary>
+        /// <typeparam name="T">The type if items in the source <see cref="ReadOnlyMemory{T}"/>.</typeparam>
+        /// <param name="memory">The source <see cref="ReadOnlyMemory{T}"/>, of type <typeparamref name="T"/>.</param>
+        /// <returns>A <see cref="ReadOnlyMemory{T}"/> of bytes.</returns>
+        /// <exception cref="OverflowException">
+        /// Thrown if the <see cref="ReadOnlyMemory{T}.Length"/> property of the new <see cref="ReadOnlyMemory{T}"/> would exceed <see cref="int.MaxValue"/>.
+        /// </exception>
+        [Pure]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static ReadOnlyMemory<byte> AsBytes<T>(this ReadOnlyMemory<T> memory)
+            where T : unmanaged
+        {
+            return Cast<T, byte>(memory);
+        }
+
         /// <summary>
         /// Casts a <see cref="ReadOnlyMemory{T}"/> of one primitive type <typeparamref name="TFrom"/> to another primitive type <typeparamref name="TTo"/>.
         /// </summary>

Microsoft.Toolkit.HighPerformance/Extensions/ReadOnlySpanExtensions.cs

@@ -176,14 +176,10 @@ public static int Count<T>(this ReadOnlySpan<T> span, T value)
 
         /// <summary>
         /// Casts a <see cref="ReadOnlySpan{T}"/> of one primitive type <typeparamref name="T"/> to <see cref="ReadOnlySpan{T}"/> of bytes.
-        /// That type may not contain pointers or references. This is checked at runtime in order to preserve type safety.
         /// </summary>
         /// <typeparam name="T">The type if items in the source <see cref="ReadOnlySpan{T}"/>.</typeparam>
         /// <param name="span">The source slice, of type <typeparamref name="T"/>.</param>
         /// <returns>A <see cref="ReadOnlySpan{T}"/> of bytes.</returns>
-        /// <exception cref="ArgumentException">
-        /// Thrown when <typeparamref name="T"/> contains pointers.
-        /// </exception>
         /// <exception cref="OverflowException">
         /// Thrown if the <see cref="ReadOnlySpan{T}.Length"/> property of the new <see cref="ReadOnlySpan{T}"/> would exceed <see cref="int.MaxValue"/>.
         /// </exception>

Microsoft.Toolkit.HighPerformance/Extensions/SpanExtensions.cs

@@ -50,14 +50,10 @@ public static ref T DangerousGetReferenceAt<T>(this Span<T> span, int i)
 
         /// <summary>
         /// Casts a <see cref="Span{T}"/> of one primitive type <typeparamref name="T"/> to <see cref="Span{T}"/> of bytes.
-        /// That type may not contain pointers or references. This is checked at runtime in order to preserve type safety.
         /// </summary>
         /// <typeparam name="T">The type if items in the source <see cref="Span{T}"/>.</typeparam>
         /// <param name="span">The source slice, of type <typeparamref name="T"/>.</param>
         /// <returns>A <see cref="Span{T}"/> of bytes.</returns>
-        /// <exception cref="ArgumentException">
-        /// Thrown when <typeparamref name="T"/> contains pointers.
-        /// </exception>
         /// <exception cref="OverflowException">
         /// Thrown if the <see cref="Span{T}.Length"/> property of the new <see cref="Span{T}"/> would exceed <see cref="int.MaxValue"/>.
         /// </exception>