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Undefined.cs
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42 lines (37 loc) · 1.25 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
namespace Microsoft.ClearScript
{
/// <summary>
/// Represents an undefined value.
/// </summary>
/// <remarks>
/// Some script languages support one or more special non-<c>null</c> values that represent
/// nonexistent, missing, unknown, or undefined data. The ClearScript library maps such values
/// to an instance of this class.
/// </remarks>
/// <c><seealso cref="ScriptEngine.UndefinedImportValue"/></c>
public class Undefined
{
/// <summary>
/// The sole instance of the <c><see cref="Undefined"/></c> class.
/// </summary>
public static readonly Undefined Value = new();
private Undefined()
{
}
#region Object overrides
/// <summary>
/// Returns a string that represents the current object.
/// </summary>
/// <returns>A string that represents the current object.</returns>
/// <remarks>
/// The <c><see cref="Undefined"/></c> version of this method returns "[undefined]".
/// </remarks>
public override string ToString()
{
return "[undefined]";
}
#endregion
}
}