// 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 Microsoft.CodeAnalysis.Shared.TestHooks;

internal sealed class EmptyAsyncToken : IAsyncToken
{
    public static IAsyncToken Instance { get; } = new EmptyAsyncToken();

    public bool IsNull => true;

    private EmptyAsyncToken()
    {
    }

    public void Dispose()
    {
        // Empty by design requirement: operations which use IAsyncToken are free to optimize code sequences by
        // eliding calls to EmptyAsyncToken.Dispose() with the understanding that it doesn't do anything.
    }
}