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See:
          Description
| Interface Summary | |
|---|---|
| Hold | Something that may be released, or undone. | 
| Spool | An unwindable spool of holds. | 
| Class Summary | |
|---|---|
| Spool0 | Null implementation of a spool; it is always empty and never unwinds. | 
| Spool1 | Basic implementation of a spool. | 
| SpoolT | A thread-safe implementation of a spool, based on a Vector. | 
Facilities to manage holding and releasing of programmatic resources.
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