extend OrderedSet with convenience methods ensure_at_front/end.. #981
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…l eg in implementing a list of "recent documents"
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…l eg in implementing a list of "recent documents"
Checklist
Description
Bugfix: Fails to insert at index 0 into empty container (off by one error)
For situations such as implementing a list of "recent documents" eg for text editor, it's necessary to maintain an ordered set, but with the additional capability of prepending/appending a new instance if the object doesn't yet exist in the set, or if it does, shifting the object to the front/back. This functionality has been added.
Furthermore, the convenience method
contains, which can be used by clients without requiring them to know the internal representation of the class, (anddebug_struseful for printing/debugging)