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//--------------------------------------------------------------------------

// 

//  Copyright (c) Microsoft Corporation.  All rights reserved. 

// 

//  File: CompletedTask.cs

//

//--------------------------------------------------------------------------

namespace System.Threading.Tasks

{

    /// <summary>Provides access to an already completed task.</summary>

    /// <remarks>A completed task can be useful for using ContinueWith overloads where there aren't StartNew equivalents.</remarks>

    public static class CompletedTask

    {

        /// <summary>Gets a completed Task.</summary>

        public readonly static Task Default = CompletedTask<object>.Default;

    }

    /// <summary>Provides access to an already completed task.</summary>

    /// <remarks>A completed task can be useful for using ContinueWith overloads where there aren't StartNew equivalents.</remarks>

    public static class CompletedTask<TResult>

    {

        /// <summary>Initializes a Task.</summary>

        static CompletedTask()

        {

            var tcs = new TaskCompletionSource<TResult>();

            tcs.TrySetResult(default(TResult));

            Default = tcs.Task;

        }

        /// <summary>Gets a completed Task.</summary>

        public readonly static Task<TResult> Default;

    }

}