SingleAssignmentDisposableValue
Represents a disposable resource which only allows a single assignment of its underlying disposable resource.
If an underlying disposable resource has already been set, future attempts to set the underlying disposable resource will throw an InvalidOperationException.
using System.Runtime.CompilerServices;
using System.Threading;
namespace System.Reactive.Disposables
{
[System.Runtime.CompilerServices.NullableContext(2)]
[System.Runtime.CompilerServices.Nullable(0)]
internal struct SingleAssignmentDisposableValue
{
private IDisposable _current;
public bool IsDisposed => Volatile.Read(ref _current) == BooleanDisposable.True;
public IDisposable Disposable {
get {
return System.Reactive.Disposables.Disposable.GetValueOrDefault(ref _current);
}
set {
if (System.Reactive.Disposables.Disposable.TrySetSingle(ref _current, value) == TrySetSingleResult.AlreadyAssigned)
throw new InvalidOperationException(Strings_Core.DISPOSABLE_ALREADY_ASSIGNED);
}
}
public void Dispose()
{
System.Reactive.Disposables.Disposable.Dispose(ref _current);
}
}
}