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47 lines
1.8 KiB
47 lines
1.8 KiB
5 years ago
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#if NET20 || NET30 || NET35 || NET40 || !NET_4_6
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Runtime.InteropServices;
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using System.Threading.Tasks;
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namespace System.Runtime.CompilerServices
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{
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/// <summary>Provides an awaiter for a <see cref="ValueTask{TResult}"/>.</summary>
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public struct ValueTaskAwaiter<TResult> : ICriticalNotifyCompletion
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{
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/// <summary>The value being awaited.</summary>
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private readonly ValueTask<TResult> _value;
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/// <summary>Initializes the awaiter.</summary>
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/// <param name="value">The value to be awaited.</param>
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internal ValueTaskAwaiter(ValueTask<TResult> value) { _value = value; }
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/// <summary>Gets whether the <see cref="ValueTask{TResult}"/> has completed.</summary>
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public bool IsCompleted { get { return _value.IsCompleted; } }
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/// <summary>Gets the result of the ValueTask.</summary>
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public TResult GetResult()
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{
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return _value._task == null ?
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_value._result :
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_value._task.GetAwaiter().GetResult();
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}
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/// <summary>Schedules the continuation action for this ValueTask.</summary>
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public void OnCompleted(Action continuation)
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{
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_value.AsTask().ConfigureAwait(continueOnCapturedContext: true).GetAwaiter().OnCompleted(continuation);
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}
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/// <summary>Schedules the continuation action for this ValueTask.</summary>
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public void UnsafeOnCompleted(Action continuation)
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{
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_value.AsTask().ConfigureAwait(continueOnCapturedContext: true).GetAwaiter().UnsafeOnCompleted(continuation);
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}
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}
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}
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#endif
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