AnonymousDisposable A disposable that executes a delegate when disposed.

 CollectionDisposable Disposes a collection of disposables.

 NoopDisposable A singleton disposable that does nothing when disposed.

 ReferenceCountedDisposable A reference-counted wrapper for a disposable. The wrapper itself is the first reference. Once all references are disposed, the underlying disposable is disposed. All future reference disposals are no-ops.

 WrappedDisposable A wrapper around an existing disposable that ensures the existing disposable is only disposed once.

 SingleDisposable`1 A base class for disposables that need exactly-once semantics in a thread-safe way. All disposals of this instance block until the disposal is complete.

 SingleNonblockingDisposable`1 A base class for disposables that need exactly-once semantics in a thread-safe way.