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diff --git a/src/mscorlib/shared/System/Runtime/CompilerServices/StrongBox.cs b/src/mscorlib/shared/System/Runtime/CompilerServices/StrongBox.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Runtime.CompilerServices
+{
+ /// <summary>
+ /// Holds a reference to a value.
+ /// </summary>
+ /// <typeparam name="T">The type of the value that the <see cref = "StrongBox{T}"></see> references.</typeparam>
+ public class StrongBox<T> : IStrongBox
+ {
+ /// <summary>
+ /// Gets the strongly typed value associated with the <see cref = "StrongBox{T}"></see>
+ /// <remarks>This is explicitly exposed as a field instead of a property to enable loading the address of the field.</remarks>
+ /// </summary>
+ [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
+ public T Value;
+
+ /// <summary>
+ /// Initializes a new StrongBox which can receive a value when used in a reference call.
+ /// </summary>
+ public StrongBox()
+ {
+ }
+
+ /// <summary>
+ /// Initializes a new <see cref = "StrongBox{T}"></see> with the specified value.
+ /// </summary>
+ /// <param name="value">A value that the <see cref = "StrongBox{T}"></see> will reference.</param>
+ public StrongBox(T value)
+ {
+ Value = value;
+ }
+
+ object IStrongBox.Value
+ {
+ get
+ {
+ return Value;
+ }
+ set
+ {
+ Value = (T)value;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Defines a property for accessing the value that an object references.
+ /// </summary>
+ public interface IStrongBox
+ {
+ /// <summary>
+ /// Gets or sets the value the object references.
+ /// </summary>
+ object Value { get; set; }
+ }
+}