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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.
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
namespace System.Runtime.CompilerServices
{
/// <summary>Provides an awaiter for a <see cref="ValueTask{TResult}"/>.</summary>
public struct ValueTaskAwaiter<TResult> : ICriticalNotifyCompletion, IValueTaskAwaiter
{
/// <summary>The value being awaited.</summary>
private ValueTask<TResult> _value; // Methods are called on this; avoid making it readonly so as to avoid unnecessary copies
/// <summary>Initializes the awaiter.</summary>
/// <param name="value">The value to be awaited.</param>
internal ValueTaskAwaiter(ValueTask<TResult> value) => _value = value;
/// <summary>Gets whether the <see cref="ValueTask{TResult}"/> has completed.</summary>
public bool IsCompleted => _value.IsCompleted;
/// <summary>Gets the result of the ValueTask.</summary>
[StackTraceHidden]
public TResult GetResult() =>
_value._task == null ?
_value._result :
_value._task.GetAwaiter().GetResult();
/// <summary>Schedules the continuation action for this ValueTask.</summary>
public void OnCompleted(Action continuation) =>
_value.AsTask().ConfigureAwait(continueOnCapturedContext: true).GetAwaiter().OnCompleted(continuation);
/// <summary>Schedules the continuation action for this ValueTask.</summary>
public void UnsafeOnCompleted(Action continuation) =>
_value.AsTask().ConfigureAwait(continueOnCapturedContext: true).GetAwaiter().UnsafeOnCompleted(continuation);
/// <summary>Gets the task underlying <see cref="_value"/>.</summary>
internal Task<TResult> AsTask() => _value.AsTask();
/// <summary>Gets the task underlying the incomplete <see cref="_value"/>.</summary>
/// <remarks>This method is used when awaiting and IsCompleted returned false; thus we expect the value task to be wrapping a non-null task.</remarks>
Task IValueTaskAwaiter.GetTask() => _value.AsTaskExpectNonNull();
}
/// <summary>
/// Internal interface used to enable extract the Task from arbitrary ValueTask awaiters.
/// </summary>>
internal interface IValueTaskAwaiter
{
Task GetTask();
}
}
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