46 lines
1.9 KiB
C#
46 lines
1.9 KiB
C#
// 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.Threading;
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namespace System.Reactive.Disposables
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{
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/// <summary>
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/// Represents a disposable resource whose underlying disposable resource can be swapped for another disposable resource.
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/// </summary>
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internal struct MultipleAssignmentDisposableValue : ICancelable
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{
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private IDisposable? _current;
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/// <summary>
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/// Gets a value that indicates whether the object is disposed.
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/// </summary>
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public bool IsDisposed =>
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// We use a sentinel value to indicate we've been disposed. This sentinel never leaks
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// to the outside world (see the Disposable property getter), so no-one can ever assign
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// this value to us manually.
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Volatile.Read(ref _current) == BooleanDisposable.True;
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/// <summary>
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/// Gets or sets the underlying disposable. After disposal, the result of getting this property is undefined.
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/// </summary>
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/// <remarks>If the <see cref="MultipleAssignmentDisposable"/> has already been disposed, assignment to this property causes immediate disposal of the given disposable object.</remarks>
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public IDisposable? Disposable
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{
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get => Disposables.Disposable.GetValueOrDefault(ref _current);
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set => Disposables.Disposable.TrySetMultiple(ref _current, value);
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}
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public bool TrySetFirst(IDisposable disposable) => Disposables.Disposable.TrySetSingle(ref _current, disposable) == TrySetSingleResult.Success;
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/// <summary>
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/// Disposes the underlying disposable as well as all future replacements.
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/// </summary>
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public void Dispose()
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{
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Disposables.Disposable.Dispose(ref _current);
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}
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}
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}
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